Ultraviolet-aging-resistant emulsified asphalt and preparation method thereof

The invention belongs to the technical field of road modified asphalt and particularly relates to ultraviolet-ageing-resistant emulsified asphalt and a preparation method thereof. The ultraviolet-ageing-resistant emulsified asphalt comprises a component A and a component B, wherein the component A comprises the following components in percentage by mass: 35-40% of SEBS, 30-35% of aromatic hydrocarbon oil, 4-6% of furfural, 6-8% of nano CeO2, 3-4% of powdered SBR, 4-5% of pentaerythritol ester and 2-18% of isooctane; the component B comprises the following components in percentage by mass: 40-60% of road petroleum asphalt, 1-2.5% of an emulsifier and 37.5-59% of water. The preparation method of the ultraviolet-ageing-resistant emulsified asphalt comprises the following steps: mixing the component A with the component B. The natural attenuation speed of the three indexes of the ultraviolet-ageing-resistant emulsified asphalt is retarded to a certain extent in comparison with common asphalt ...

Fault probability online evaluation method of power transmission line faults caused by freezing rain

The invention discloses a fault probability online evaluation method of power transmission line faults caused by freezing rain, and belongs to the technical field of electric power systems and automation. The method includes the steps that according to space-time evolution of freezing rain disasters, loads borne by lines and towers and flashover voltages borne by insulators are evaluated dynamically, the fault probability of the power transmission lines coated with ice is calculated, and expected risk equipment sets are provided for blackout defense systems. In the method, consideration is given to various fault ways when the power transmission lines are damaged by coated ice, and the method conforms to the mechanism that the coated ice triggers the line faults and is good in practicability and adaptability.

Intelligent reconstruction method of area electric network safety stabilization control system

The invention discloses an intelligent reconstruction method of an area electric network safety stabilization control system. The method comprises following steps: taking the state of communication between stations automatically identified by the intelligent processors or the control devices in the transformer substation or the power plant as the foundation for controlling the system automatic reconstruction; automatically identifying the electric network current topological structure, tidal current section and safety stabilization key links by the exchange and integration of the on-site measurement information in control stations, calculating and forming a static safety control strategy table; automatically associating the state of communication between stations, the electric network running status and the static safety control strategy table, realizing the automatic selection of the electric network failure detection station, running mode detection station and the control operation station ...

Intelligent reconstruction method of area electric network safety stabilization control system

The invention discloses an intelligent reconstruction method of an area electric network safety stabilization control system. The method comprises following steps: taking the state of communication between stations automatically identified by the intelligent processors or the control devices in the transformer substation or the power plant as the foundation for controlling the system automatic reconstruction; automatically identifying the electric network current topological structure, tidal current section and safety stabilization key links by the exchange and integration of the on-site measurement information in control stations, calculating and forming a static safety control strategy table; automatically associating the state of communication between stations, the electric network running status and the static safety control strategy table, realizing the automatic selection of the electric network failure detection station, running mode detection station and the control operation station ...

Radio frequency loopback test method and system and loopback test local oscillator providing method and apparatus

The invention relates to a radio frequency loop-back test method, which comprises following steps: a certain clock signal is selected as local oscillator in communication system, the local oscillator and the communication system duplexer have same interval frequencies, the debugging signal is mixed to the working frequency point of receiver according to the local oscillator and transferred, the error code comparison is performed on the debugging signal. The invention relates to a radio frequency loop-back test system, which comprises a transmitting end and a receiving end, wherein, the transmitting end is used to select clock signal as the local oscillator, the local oscillator and the communication system duplexer have same interval frequencies, the debugging signal is mixed to the working frequency point of receiver according to the local oscillator and transferred; the receiving end is used for error code comparison. The invention also relates to a loop-back test local oscillator providing ...

Method for locating prime motor disturbance source triggering forced power oscillation

The invention, which belongs to the field of the power system and automation technology thereof, provides a method for locating prime motor disturbance source triggering forced power oscillation. The invention employing the system disturbed trajectory collected by wide area measurement system (WAMS) locates a disturbance source according to the phase relation characteristic between the system response trajectory and the disturbance motivation trajectory, so as to provide a decision support to the electric power system dispatching and operating control. The beneficial effects of the invention lies in that the method, which can solve the problem of distinguishing the response and motivation from the actual measurement system dynamic trajectory, has characteristics of less calculation and simple analysis procedure, so as to provide the intuitive reference for power system operating control and improves the practicability of the WAMS.

Design method for judging out-of-step separation based on application compensating impedance principle

The invention discloses a design method for judging out-of-step separation based on application impedance compensation principle. The design method can automatically obtain the real-time impedance value of the line; use the impedance compensation principle to judge out-of-step separation method according to the real-time impedance value as a line compensating impedance value and automatically identify whether the power system on the two sides of the tie line is in an out-of-step oscillation state, the out-of-step center is on the line, and correspondingly open and lock the implement of the out-of-step separation controlled action, thereby achieving the out-of-step separation control which are safe, reliable and fast action and preventing power system stabilization destruction and large area blackout caused by emergent events.

Design method for judging out-of-step separation based on application compensating impedance principle

The invention discloses a design method for judging out-of-step separation based on application impedance compensation principle. The design method can automatically obtain the real-time impedance value of the line; use the impedance compensation principle to judge out-of-step separation method according to the real-time impedance value as a line compensating impedance value and automatically identify whether the power system on the two sides of the tie line is in an out-of-step oscillation state, the out-of-step center is on the line, and correspondingly open and lock the implement of the out-of-step separation controlled action, thereby achieving the out-of-step separation control which are safe, reliable and fast action and preventing power system stabilization destruction and large area blackout caused by emergent events.

Automatic load-reducing control method for integrating the voltage frequency dynamic mutual influence

An Automatic load-reducing control method for integrating the voltage frequency dynamic mutual influence measures the state quantity information on site such as voltage, frequency and power so as to determine whether to act for implementing the load-reducing. The invention effectively takes account of the coupling degree of the voltage amount and the frequency amount under the corresponding operating condition by calculating the average frequency voltage correlation coefficient at the device installation nodes under a certain operating condition; calculating the synthetic state quantity in real time by measuring the voltage, frequency and active power of the installation node of each automatic load-reducing control device in real time and starting the automatic load-reducing control device in time based on the change circumstance, and acting in turn. The invention introduces the active power measurement into the traditional automatic load-reducing device, takes account of the interaction ...

Electric power information physical coupling modeling method based on incidence matrix

The invention discloses an electric power information physical coupling modeling method based on an incidence matrix and belongs to the field of electric power information physical system analysis technology. According to the method, first, an electric power information physical system is abstracted to form a three-layer framework comprising a physical entity layer, an information physical coupling layer and an information system layer; next, modeling is performed according to physical entities, secondary devices and communication networks in all the layers; and based on modeling, the physical entity layer, the information physical coupling layer and the information system layer are connected through the incidence matrix to form a complete electric power information physical system unit model. Through the method, communication performance can be accurately described, and the method has great significance for analysis of the safety and stability of an electric power system.

Method and device for switching signals

The embodiment of the invention discloses a device and a method for switching signals. The device for switching the signals comprises a small-power switch and a balance type power amplifier, wherein the small-power switch comprises an input end r, an output end a and an output end b; the balance type power amplifier comprises an input end a, an input end b, an output end c and an output end d; the output end a of the small-power switch is connected with the input end a of the balance type power amplifier; the output end b of the small power switch is connected with the input end b of the balance type power amplifier; the small-power switch is used for receiving small-power signals and outputting the small-power signals from a gated passageway; and the balance type power amplifier is used for receiving the small-power signals output from the mall-power switch and outputting the small-power signals after power amplification. The device and the method for switching the signals can improve ...

Low-frequency and low-voltage load-reducing control method based on multi-agent technology

The invention provides a low-frequency and low-voltage load-reducing control method based on a multi-agent technology, which comprises two processes carried out simultaneously, wherein, in process 1, a local reaction layer triggers a device to act and implement load-shedding control after judging the device meets an action condition according to the measured state quantity information in real time such as local voltage, frequency and the like; and the process 2 comprises the following steps: 1. the local reaction layer uploads the local state quantity information and the actual load-shedding capacity of the device to local coordination layers; 2. the local coordination layers upload a data analysis result to sub-region coordination layers; 3. the sub-region coordination layers calculate local deloading and weighting coefficients for the local coordination layers, and meanwhile upload an information analysis result to a total-network coordination layer; and 4. the total-network coordination ...

Method for evaluating stabilization margin of non-model actual measurement track

The invention discloses an evaluation method of stability margin of model-free measured trajectories. The core concept of the evaluation method is characterized in that: when no system models and parameters exist, a transient stability margin of a power system is evaluated according to perturbed trajectories and a credibility thereof is given. The evaluation method adopts the result whether dynamic saddle points (DSP) exist in reflection trajectories collected by PMU as a criterion for system instability. With respect to quantitative analysis, the stability margin evaluation of instable trajectories can be directly obtained through extended equal area criteria (EEAC) with an error between -5 percent and 5 percent, requiring no system models. With respect to quantitative analysis of stabletrajectories, EEAC theory is adopted to polymerize perturbed trajectories and to identify swing farthest point (FEP) on the reflection trajectories and the curve-extrapolated technique is used for fabricating ...

Layered multi-agent deep reinforcement learning power distribution network voltage regulation method

The invention discloses a hierarchical multi-agent deep reinforcement learning power distribution network voltage regulation method. The method comprises the following steps: establishing a multi-type hybrid equipment power distribution network voltage regulation optimization model; according to different time scales of regulation and control equipment, a fast and slow time scale double-layer Markov game is constructed; the upper-layer Markov game is solved by adopting a discrete attention multi-agent deep reinforcement learning algorithm, the lower-layer Markov game is solved by adopting a continuous attention multi-agent deep reinforcement learning algorithm, and the upper-layer multi-agent and the lower-layer multi-agent realize efficient collaboration of multi-type equipment with different time scales through interaction of reward information. And finally, a collaborative voltage regulation strategy under discrete, continuous and fast and slow time scales is obtained. According to the ...

Self adaptation system protection for Electric Power System

Integrated coordinating control method for security stabilization early warning, preventing control and emergency control

The invention relates to an integration coordination control method of the early security and stability warning, prevention and control and emergency control of large power grids and includes the following steps: various steady data and dynamic data of large power grids are gathered; the present modes are matched with serious historical fault forms in real time as the online appending presupposition fault of stable analytic calculation; the curve data is mined with area methods such as expansion after the power grid is simulated to extract the stable quantitative characteristics of a system; when the power grid has positive secure stability margins, the stability margins and relevant sensitivity analysis technology are used for calculating the limit output and load of a generator and the limit power of a stability section; when the power grid has negative secure stability margins, the prevention and control and emergency control are calculated to confirm the amount of prevention and control ...

Electrical power system on-line safety and stability evaluation forecast failure collection adaptive selection method

The invention relates to a self-adaptive screening method for an anticipated fault set in power system security and stability on-line assessment, which is suitable for determining the anticipated fault set in the static, transient and dynamic security and stability on-line assessment of the power system. The method adopts the core concept that the fault set required to be recalculated in the security and stability on-line assessment is determined according to the mode of the security and stability margin of all anticipated faults given by the security and stability on-line assessment in the previous round of the power network. The invention takes the power network security and stability margin and the security and stability mode as the quantitative index of the power network security and stability degree, takes the security and stability margin as the index, and screens the anticipated fault subset required to be recalculated from the anticipated fault universal set by combining the security ...

Power support capacity distribution method of different DC lines in multi-DC system

The invention discloses a power support capacity distribution method of different DC lines in a multi-DC system, and belongs to the technical field of an electric power system and automation thereof. The method comprises: calculating the contribution of the different DC lines in improving transient power angle stability, the DC line maximum voltage controllable amount satisfying voltage safety constraints, and a support capacity integrated contribution index of each DC line, then determining a power support capacity distribution mode, and performing power support capacity distribution on each DC line. The method provided by the invention can be used for solving the problems of priority order determination and support capacity distribution of DC emergent power support of a multi-DC system, is helpful in fully utilizing the controllability characteristic of the DC system, improves transient stability of the system, prevents motor tripping or reduces motor tripping, and improves operation ...

In-line monitoring and prevention control method with stable transient for power system

Accurate measurement system for liquid level of gasification furnace quench chamber

The invention discloses an accurate measurement system for a liquid level of a gasification furnace quench chamber. The accurate measurement system comprises the gasification furnace quench chamber (1) and a differential pressure level meter (2); a double-flange differential pressure liquid level transmitter (4) which is connected with a density calculation module (3) through a signal line is arranged on the lower part of the gasification furnace quench chamber (1); the density calculation module (3) is connected with the differential pressure level meter (2) through a signal line; an upper flange opening (5) and a lower flange opening (6) in the double-flange differential pressure liquid level transmitter (4) are respectively formed in the lower part of the gasification furnace quench chamber (1); the part, connected with the gasification furnace quench chamber (1), of the upper flange opening (5) is positioned between a minimal operating liquid level (7) and a drying furnace liquid level ...

Box-type temperature control energy storage station capable of being connected in parallel

The invention discloses a box-type temperature control energy storage station capable of being connected in parallel. The box-type temperature control energy storage station comprises an energy storage box body formed by an alloy pipe and movable plates, wherein a power distribution cabinet, an air conditioner power supply device, a monitoring controller, an air conditioner, a power transformer, a lithium battery energy storage cabinet and a voltage changer are arranged in the energy storage box body. Compared with a traditional energy storage station, interfaces of the box-type temperature control energy storage station are independent; multiple energy storage station bodies can be connected in parallel to achieve higher power output capacity; an independent two-way converter device is arranged in the energy storage station, and independent work is allowed; lithium batteries serve as an energy storage unit of the energy storage station, and are long in service life and high in environment ...

Closed-loop self-adaption emergency control method for large electric network í«í«(í«centralized coordination, demixing controlí») í»í»

A closed loop self-adapting emergency control method of power pool' centralized harmonization and hierarchy control' is disclosed, which adopts the quadrilayer structure of a dispatching center station, a control main station, a control sub-station and a control execution station from top to bottom, including the following control steps: 1. safely and stably controlling the system uploading operation data to the dispatching center station; 2. controlling the decision-making computation by the dispatching center station to obtain the online strategy table; 3. sending down the online strategy to the control main station by the dispatching center station and furthermore sending down to the related control sub-station by the control main station; 4.judging the failure and the overload according to the related failure and the overloading criterion by the control sub-station and the execution station; 5. transmitting the failure information to the upper control station layer by layer by the control ...

Power system temporary stability and thermal stabilization cooperativeness emergency control method

Direct-current power emergency control performance index calculation method for improving transient power angle stability of power grid

The invention discloses a direct-current power emergency control performance index calculation method for improving the transient power angle stability of a power grid and belongs to the technical field of power system and automation. According to the method, units in a leading group and units in a remaining group are screened to form a grouping boundary bus set; grouping boundary buses are equalized to a virtual bus; a virtual subcircuit is added based on the equivalent virtual bus; the equivalent impedance of each direct-current converter station bus and the equivalent impedance of buses at the two ends of the virtual subcircuit are worked out to group the direct-current converter station buses; weighting and summation are carried out on participation factors of the units in the groups which the units belong to through equivalent transadmittance module values of the direct-current converter station buses and a generator bus; the transient power angle stability performance index of each ...

Wind energy caching low voltage ride through and reactive supporting control method for double-feed draught fan

The invention discloses a wind energy caching low voltage ride through and reactive supporting control method for a double-feed draught fan and belongs to the technical field of automatic control over wind driven generators. The purpose of reducing the currents of a rotor is achieved by switching electromagnetic torque reference values in a rotor side (RSC) control circuit under grid faults and temporarily storing surplus wind energy captured under the faults into rotor inertia energy. After the voltage recovers, a traditional circuit is switched back by an RSC, after the switch, overcurrent of the voltage recovery segment is avoided by temporarily limiting the electromagnetic torque of the RSC, and energy balance recovers safely. After a cascading feedback type reactive controller is applied, a fan can also provide reactive supporting safely for a grid in the whole low voltage ride through process. Compared with the prior art, the method is high in control strategy speed, new hardware ...

On-line decision-premaking adaptive stabilizing protection system

The present invention provides a computer program for energy management system of electrical power system to make the prevention control capacity of the electrical power system raised to dynamic safety level from static safety level. According to the various state data collected on-line by electrical power system and practical working condition reflected by measured results or according to the prereported research working condition said invention uses an integrated EEAC to quick calculate the critical checkout time (CCT) of various faults and limit power.

Simplification method for optimal cutting machine control strategy search of electric system transient stability

The invention discloses a simplification method for the optimal cutting machine control strategy search of electric system transient stability, and belongs to the technical field of electric system emergency control. On the basis of an EEAC (Extend Equal Area Criterion), according to the analysis results and the difference of a SEEAC (Static EEAC) algorithm and a DEEAC (Dynamic EEAC) algorithm, an anticipatory fault set is classified on the basis of transient stability severity; a diffset which is identified as an unstability class is subjected to a simplification operation by utilizing an intermediate result subjected to margin calculation through the SEEAC algorithm and the DEEAD algorithm during identifiction; meanwhile, a cutting machine control strategy checking index is designed to check the effectiveness of each cutting machine and guide a simplification method and a traditional method to switch so as to guarantee that the obtain cutting machine control strategy is optimal. The method ...

Economy analysis method for electric vehicles to provide auxiliary services

The invention discloses a method for analyzing economic benefits of frequency modulation and spinning reserve provided by electric vehicles. The method comprises the steps of the analysis on economic benefits of frequency modulation provided by the electric vehicles and the analysis on economic benefits of spinning reserve provided by the electric vehicles. The total revenue of frequency modulation and spinning reserve of the electric vehicles comprises the reserve capacity revenue, electric energy revenue and the environmental protection compensation revenue; the cost comprises the battery charging cost and the battery loss. The method shows that by reasonably controlling/dispatching the electric vehicles to be charged and discharged, the auxiliary services can be provided for an electric system, and safety and economy of operation of the system are improved.

New energy cluster output delivery risk online analysis method under natural disasters

The invention discloses a new energy cluster output delivery risk online analysis method under natural disasters, and the method comprises the steps: obtaining power grid state estimation data, to-be-analyzed new energy power station prediction data, and power transmission channels and assessment fault data associated with a new energy power station set according to a set risk analysis period; performing static safety check according to the obtained data to obtain the sensitivity of the active power output of each new energy power station to the active power flow of the power transmission channel and a branch on-off distribution factor, solving a pre-constructed new energy power station set output optimization model to obtain the maximum value of the output sum of the new energy power station set and the key limited factor of the maximum value, determining a sending-out insufficiency risk of the new energy power station set; determining an insufficient output risk according to the prediction ...

Method for identifying element participation factors in transient safe and stable mode of power system

The invention discloses a method for identifying element participation factors in a transient safe and stable mode of a power system, which identifies participation factors of generators and buses in a transient safe and stable mode and provides more detailed quantitative analysis and decision support for power system operation mode adjustment, electricity transmission limit calculation, control decision optimization and the like. The method comprises the following steps: according to transient power angle stable quantitative information given by an expanded equal-area criterion, identifying the participation factors of the generators in a transient power angle stable mode on the basis of the proportional relation between the acceleration kinetic energy or the deceleration kinetic energy of each generator; according to transient voltage safe and stable quantitative information given by a transient voltage safe and stable quantitative analysis method, identifying the participation factors ...

Design method for judging out-of-step separation based on in-place active/idle work variable quantity

The invention discloses a design method for judging out-of-step separation based on active/reactive variants in-situ. When the mechanical accelerated power of the system exceeds the electric braking power, if the electric braking power continuously reduces while the phase angle continuously increases, the unit is further accelerated and the out-of-step occurs, thus the time is the critical out-of-step time of the system. The design method of the invention is based on principle of conservation of energy and can achieve the safe and reliable out-of-step separation control of the power system in-situ with fast action, thereby preventing power system stabilization destruction and large area blackout caused by emergent events.

Method for evaluating transmission line fault caused by rainstorm

The invention discloses a method for evaluating a transmission line fault caused by rainstorm and belongs to the technical field of power systems and automation of the power systems. According to the mechanism that the rainstorm causes the transmission line fault, an accurate line fault probability model is established, and internal and external factors relevant with the transmission line fault are correctly reflected, so that evaluation on the transmission line fault caused by the rainstorm does not depend on accumulated historical data, pole tower stress and strength calculation are also avoided, various relevant factors are fully considered, and the method has good adaptability. By adopting the method, transmission line risk management is pushed greatly, and the capacity of defending the power systems against external disasters is enhanced.

Criterion for measuring breaking step oscillation center position based on in situ electric quantity

The invention discloses a criterion for combining local electrical amount with relevant line parameters to accurately measure the position of an oscillation center and measure the position of a system desynchronizing oscillation center based on in-situ electrical amount. The popularization and application of the criterion for measuring the position of a system desynchronizing oscillation center based on in-situ electrical amount can realize in-situ, safe and reliable power system desynchronizing stepout control with quick action and definite action scope by combining reliable stepout criterion and realize the cooperative control of multiple sets of desynchronizing stepout devices by automatically adapting different power network running modes.

Medical heat lamp

The utility model belongs to the technical field of medical instrument, a medical heat lamp is disclosed. This medical heat lamp includes the bottom plate, is provided with the annular shell of circle on the bottom plate, evenly is provided with a plurality of roast lamps on the interior circumference of shell, and the shell is provided with a plurality of switches that correspond a plurality of roast lamps of control outward, is provided with the the control unit of a plurality of switches of control on the bottom plate, the left and right sides correspondence of shell is provided with coniform left sealing ring and the right sealing ring that is used for sheltering from light, and the middle part of left sealing ring and right sealing ring is provided with the through -hole that supplies limbs to pass through, the shell comprises annular first shell of semicircle and annular second shell of semicircle, and hinge connection is passed through to the one end of first shell and second shell ...

Method for comprehensively evaluating precision of stability calculation models and parameters based on PMU data

The invention belongs to the technical field of the calculation and analysis of a power system, and discloses a method for comprehensively evaluating the precision of stability calculation models and parameters based on PMU data. The method comprises the following steps: performing time-domain simulation on an electromechanical transient process and an electromechanical dynamic process for the disturbance of a power grid, and adopting a power system security and stability quantitative analyzing method to calculate transient security and stability margins, modes, dynamic oscillation damping ratio and frequency; (2) adopting PMU actually-measured data on the power angle and frequency of a generator and the voltage and frequency of a busbar after the disturbance of the power grid to take place of time-domain simulation results of corresponding physical quantities, and then adopting the power system security and stability quantitative analyzing method to calculate the transient security and ...

N-2 combined fault quick sequencing method for transient stability analysis of electric power system

The invention belongs to the field of operation and control of electric power systems and provides an N-2 combined fault quick sequencing method for transient stability analysis of an electric power system, which is used for sequencing arbitrarily combined N-2 fault of an electric power system according to the severity of the transient stability. Based on the quantized evaluation information of the transient stability of the N-1 fault, the method calculates the severity index of the transient stability of the N-2 combined fault by combining the information of the power sensitivity of the powerchange of a second switching element on the transient stability critical generator group of the first fault element, thereby sequencing the N-2 combined fault set of the transient stability analysisof the electric power system. The method can be used for sequencing a large quantity of N-2 combine faults according to the severity of the transient stability when the operation mode, the model and the ...

Platform is verified to electric power system closed loop based on real -time digital simulation ware

The utility model discloses a platform is verified to electric power system closed loop based on real -time digital simulation ware, including real -time digital simulation ware RTDS, information control main website and decision -making system, information control main website passes through the ethernet and is connected with real -time digital simulation ware RTDS and decision -making system respectively, realizes real -time digital simulation ware RTDS and decision -making system communication. The utility model discloses an information interaction between real -time digital simulation ware RTDS and the decision -making system, verification control strategy's that not only can be directly perceived, convenient validity, moreover very big degree optimization the research and development and test verification mode of online safety and stability early warning with the aid decision system, just the utility model relates to a rationally, has very strong practicality.

Power system safety stabilization emergency control policy automatical matching method

Method for implementing frequency voltage emergency control of power system

The invention discloses a method for implementing emergency control of frequency voltage in a power system. The emergency state of the frequency voltage, abnormal state of a measurement circuit and a load feedback state in the power system are automatically identified based on a bus voltage V, frequency f and a current I of a generator or a load in the installation site of the frequency voltage emergency control device, further the execution of the emergency control action is correspondingly opened or locked. The introduction of current measurement in the conventional control device solves the difficult problem that the device measurement abnormity is not correctly distinguished from the emergency state of the electric network only depending on the change rate of the frequency or the voltage.

Method for calculating interactive-influenced electricity transmission limit with multiple sections and stable transmission level

The invention belongs to the technical field of electrical power systems and automation thereof, and provides a method for calculating interactive-influenced electricity transmission limit with multiple sections and a stable transmission level. The invention can be applied to the safe and stable off-line analysis calculation, real-time early warning and on-line auxiliary decision making of the electrical power systems. The method comprises the following steps of: firstly, determining electricity transmission section collection to be inspected; secondly, appointing one anticipated fault scene for each electricity transmission section; thirdly, taking one tidal current of the ground state of the electrical power system; fourthly, carrying out time domain simulation on each anticipated fault scene according to the tidal current of the ground state, the model and the parameters of the electrical power system, and calculating a system stability margin led by each section by adopting EEAC (Extended ...

On-line analysis and aid decision making method for low-frequency oscillation of electric power system

The invention provides an on-line analysis and an aid decision making method for the low-frequency oscillation of an electric power system. According to information which is measured by a PMU and reflects the dynamic process of a power network, such as electric generator power angle, active power, busbar voltage phase angle, circuit active power, transformer active power, and the like, the invention monitors the low-frequency oscillation event of the power network online, identifies an oscillation mode and a strongly relevant machine set, counts participation factors, recognizes the approximate area of an oscillation center, and offers aid decision making information for restraining the oscillation on time. The invention conquers a problem that the analysis of the low-frequency oscillationis difficult since a power network model and a parameter are not exact, changes a situation that the low-frequency oscillation is lack of monitoring and analyzing method as well as can not be fast reacted ...

Control method for isolated network solar-wind-oil hybrid electricity generating system

The invention discloses a control method for an isolated network solar-wind-oil hybrid electricity generating system. The control method comprises the steps that a power switch is switched on, a voltage stabilizing module supplies electricity to related units, the photoelectricity unit, the wind electricity unit and the oil electricity unit are started, the energy storage unit is charged, information of charging voltage, current, temperature and charging power of the units is transmitted to a direct-current energy storage controller, an alternating-current electricity utilization controller transmits the monitored output power of the oil utilization unit to the direct-current energy storage controller, the direct-current energy storage controller calculates the output power of the current photoelectricity unit, the wind electricity unit, the oil electricity unit, the surplus power charging unit and a load electricity utilization power value, the direct-current energy storage controller ...

Closed-loop self-adaption emergency control method for large electric network 'centralized coordination, layered control'

A closed loop self-adapting emergency control method of power pool' centralized harmonization and hierarchy control' is disclosed, which adopts the quadrilayer structure of a dispatching center station, a control main station, a control sub-station and a control execution station from top to bottom, including the following control steps: 1. safely and stably controlling the system uploading operation data to the dispatching center station; 2. controlling the decision-making computation by the dispatching center station to obtain the online strategy table; 3. sending down the online strategy to the control main station by the dispatching center station and furthermore sending down to the related control sub-station by the control main station; 4.judging the failure and the overload according to the related failure and the overloading criterion by the control sub-station and the execution station; 5. transmitting the failure information to the upper control station layer by layer by the control ...

Typical fault set identification method for transient stability analysis of power system

The invention belongs to the technical field of power system computation and analysis and is applied to generating a typical fault set for transient stability analysis of a power system. The method comprises the following steps of: firstly, for the same power grid operation mode, performing the transient stability evaluation on different faults respectively by adopting a transient stability quantitative evaluation method to obtain a stability mode of each fault; secondly, calculating a transient stability association degree index between different faults according to a constitutive relation between the participation factor of the same generators in the transient stability critical generator set of every two faults and the participation factor of all the generators in the critical generator set; and finally, screening all the faults according to the transient stability association degree index between the faults. Therefore, the typical fault set for the transient stability analysis of the ...

Criterion for measuring breaking step oscillation center position based on in situ electric quantity

The invention discloses a criterion for combining local electrical amount with relevant line parameters to accurately measure the position of an oscillation center and measure the position of a system desynchronizing oscillation center based on in-situ electrical amount. The popularization and application of the criterion for measuring the position of a system desynchronizing oscillation center based on in-situ electrical amount can realize in-situ, safe and reliable power system desynchronizing stepout control with quick action and definite action scope by combining reliable stepout criterion and realize the cooperative control of multiple sets of desynchronizing stepout devices by automatically adapting different power network running modes.

Quick robust classification method of preconceived faults for power system transient stability assessment

The invention discloses a quick robust classification method of preconceived faults for power system transient stability assessment and belongs to the technical field of power systems and automation thereof. The method is based on an extended equal area criterion and divides examples in a preconceived fault universal set into five classifications, i.e., stable, doubtfully stable, critical, doubtfully instable and instable by deeply mining different allowance information and comparison results thereof contained by transient stability analysis algorithms with different integration steps, reflecting the time-varying degree of research examples and forming identification rules for different classifications of transient stability severity in combination with fault information. The quick robust classification method of preconceived faults for power system transient stability assessment can realize high-efficiency, reliable and reasonable classification of different classifications of transient ...

Integrated coordinating control method for security stabilization early warning, preventing control and emergency control

The invention relates to an integration coordination control method of the early security and stability warning, prevention and control and emergency control of large power grids and includes the following steps: various steady data and dynamic data of large power grids are gathered; the present modes are matched with serious historical fault forms in real time as the online appending presupposition fault of stable analytic calculation; the curve data is mined with the area methods such as expansion after the power grid is simulated to extract the stable quantitative characteristics of a system; when the power grid has positive secure stability margins, the stability margins and relevant sensitivity analysis technology are used for calculating the limit output and load of a generator and the limit power of a stability section; when the power grid has the negative secure stability margins, the prevention and control and emergency control are calculated to confirm the amount of prevention ...

Three-segment out-of-step self-adaptive disconnecting method

The invention discloses a three-segment out-of-step self-adaptive disconnecting method. The method utilizes effective rapid detection to judge system out-of-step and accurately measure criterions of aThe invention discloses a three-segment out-of-step self-adaptive disconnecting method. The method utilizes effective rapid detection to judge system out-of-step and accurately measure criterions of an oscillation center, and performs disconnecting judgment in three segments according to whether the oscillation center is in a protection scope of a device-installing position during the out-of-step,n oscillation center, and performs disconnecting judgment in three segments according to whether the oscillation center is in a protection scope of a device-installing position during the out-of-step, thus an out-of-step disconnecting device can perform self-adaptive judgment for disconnection as a relay protection device so as to provide convenience for setting fixed values of users and adapt tothus ...

Method for recognizing transmission section power limit interval of power system transient stability

The invention discloses a method for recognizing a transmission section power limit interval of power system transient stability, which comprises the steps of: respectively carrying out transient security stability evaluation on faults in a transmission section transient security stability check fault set by adopting a transient angle stability quantitative evaluation method and a transient voltage security stability quantitative evaluation method to obtain a transient angle stability mode and a transient voltage security stability mode of each fault; respectively calculating impact factors of each generator and each load to the transmission section power limit according to participation factors of the generators and the load, the sensitivity of the power to the transmission section power, the transient angle stability margin and the transient voltage security stability margin; and calculating the minimum value and the maximum value of the transmission section power limit through regulating ...

Power system safety stabilization emergency control policy automatically matching method

A power system safe and reliable emergency control strategy automatic matching method, includes the following steps: 1. computing the emergency control strategy adopted when the forecast element fails under the typical operation state of the power system, organizing the strategy structure according to the operation state, the failure element and the failure types; 2. determining the current operation state of the power system according to the real-time operation condition of the power system; 3. determining the failures forms according to the element with the failure and the failure types, when failing; 4. obtaining the control strategy according to the matching of the operation state of the obtained power system and the failure. The inventive method realizes the rapidity requirement of the power system safe and reliable emergency control strategy automatic match, wherein the control strategy has clear consecution and the automatic match is effectively.

Isolated network solar-wind-oil hybrid electricity generating system

The invention discloses an isolated network solar-wind-oil hybrid power generating system which comprises a photoelectric unit, a wind electricity unit, an oil electricity unit, an energy storage unit, an alternating current sensor, a surplus power charging unit, a direct-current storage controller, an alternating-current electricity utilization controller, an inverter, a man-machine operating fault warning unit, a metering unit, an electricity utilization unit, a power switch and a voltage stabilizing module. An isolated network system of an independent system is formed through combination of intelligent monitoring and a software optimization algorithm, and a grid-connected interface connected with other power grids is reserved. According to the isolated network solar-wind-oil hybrid power generating system, firstly, peak load regulation is carried out by the adoption of an energy storage station (energy storage unit), the isolated network solar-wind-oil hybrid power generating system ...

Optimal power flow implementation method considering transient security constraints

The invention belongs to the field of safe and economical operation of power systems, and provides an optimal power flow (OTS) implementation method considering transient security constraints, which is based on safe and stable quantitative analysis and optimization decision theory and method- extended equal-area criterion (EEAC), brings transient security of a system into a traditional optimal power flow (OPF) mode, uniformly coordinates and considers safety and economical efficiency of operation of the system, and provides decision support for safe and economical operation of the power system. The method divides an OTS problem into two sub problems including an OPF problem and a prevention control problem according to a transient stable control mechanism disclosed by the EEAC, achieves an optimal economical adjustment scheme meeting transient safe and stable constraints on an OPF operation point based on a safe and stable mode, and leads the optimal economical adjustment scheme into an ...

Signal Transceiver Apparatus and Base Station

A signal transceiver apparatus, including at least one plug-in card and a backplane. The plug-in card includes two waveguide boards, a multi-layer circuit board disposed between the two waveguide boards, and an antenna array and a first waveguide interface that are mounted on each of the two waveguide boards. A waveguide slot is provided on one side, facing the multi-layer circuit board, of each of the two waveguide boards. A metal layer corresponding to the waveguide slot is disposed on each of two sides of the multi-layer circuit board. The “corresponding to” means that the metal layers and the waveguide slots cooperate to form two waveguide channels that are respectively located on two sides of the multi-layer circuit board and that each are connected to the antenna array and the first waveguide interface

Ultra-long-spaced OPGW (Optical Fiber Composite Overhead Ground Wire) optical fiber communication system capable of obtaining energy on site and implementation method thereof

The invention discloses an ultra-long-spaced OPGW (Optical Fiber Composite Overhead Ground Wire) optical fiber communication system capable of obtaining energy on site and an implementation method thereof, and belongs to the technical field of power system communication. The ultra-long-spaced OPGW optical fiber communication system capable of obtaining energy on site comprises an OPGW optical fiber and an erbium-doped optical fiber amplifier, a high-voltage energy-obtaining coil is arranged on a high-voltage power transmission line, magnetic energy radiated by the high-voltage power transmission line is converted into electric energy by using the high-voltage energy-obtaining coil to obtain induction current to be supplied to the erbium-doped optical fiber amplifier, and the strength of the induction current is controlled by using a voltage stabilizing circuit to prevent strong electric impact; meanwhile, a solar cell is taken as a backup power supply; when circuit failure power cut occurs ...

Electrical power system on-line safety and stability evaluation forecast failure collection adaptive selection method

The invention relates to a self-adaptive screening method for an anticipated fault set in power system security and stability on-line assessment, which is suitable for determining the anticipated fault set in the static, transient and dynamic security and stability on-line assessment of the power system. The method adopts the core concept that the fault set required to be recalculated in the security and stability on-line assessment is determined according to the mode of the security and stability margin of all anticipated faults given by the security and stability on-line assessment in the previous round of the power network. The invention takes the power network security and stability margin and the security and stability mode as the quantitative index of the power network security and stability degree, takes the security and stability margin as the index, and screens the anticipated fault subset required to be recalculated from the anticipated fault universal set by combining the security ...

Preconceived fault transient stability quasi-quantitative credibility analysis method and related device

The invention discloses an anticipated fault transient stability quasi-quantitative credibility analysis and related device, and the method comprises the steps: carrying out the first-layer transient stability quasi-quantitative credibility analysis based on a Taylor expansion method of a classic model of a power system, and if the credibility is insufficient and the stability is uncertain, carrying out the first-layer transient stability quasi-quantitative credibility analysis; further carrying out transient stability quasi-quantitative credibility analysis by adopting multi-stage operation; in the multi-stage operation, a numerical integration method based on an actual model of a power system is adopted, the influence of complexity factors is considered, disturbed trajectories of part of numerical integration segments are obtained, then the influence of the complexity factors is ignored, and disturbed trajectories of subsequent segments are obtained by adopting a classic model Taylor ...

Method for evaluating stabilization margin of non-model actual measurement track

The invention discloses an evaluation method of stability margin of model-free measured trajectories. The core concept of the evaluation method is characterized in that: when no system models and parameters exist, a transient stability margin of a power system is evaluated according to perturbed trajectories and a credibility thereof is given. The evaluation method adopts the result whether dynamic saddle points (DSP) exist in reflection trajectories collected by PMU as a criterion for system instability. With respect to quantitative analysis, the stability margin evaluation of instable trajectories can be directly obtained through extended equal area criteria (EEAC) with an error between -5 percent and 5 percent, requiring no system models. With respect to quantitative analysis of stable trajectories, EEAC theory is adopted to polymerize perturbed trajectories and to identify swing farthest point (FEP) on the reflection trajectories and the curve-extrapolated technique is used for fabricating ...

Optimal power flow implementation method considering transient security constraints

The invention belongs to the field of safe and economical operation of power systems, and provides an optimal power flow (OTS) implementation method considering transient security constraints, which is based on safe and stable quantitative analysis and optimization decision theory and method- extended equal-area criterion (EEAC), brings transient security of a system into a traditional optimal power flow (OPF) mode, uniformly coordinates and considers safety and economical efficiency of operation of the system, and provides decision support for safe and economical operation of the power system. The method divides an OTS problem into two sub problems including an OPF problem and a prevention control problem according to a transient stable control mechanism disclosed by the EEAC, achieves an optimal economical adjustment scheme meeting transient safe and stable constraints on an OPF operation point based on a safe and stable mode, and leads the optimal economical adjustment scheme into an ...

Quick-assembled embossing die

The utility model relates to a quick-assembled embossing mould, comprising a mould plate. The quick-assembled embossing mould is characterized in that the back surface of the mould plate is provided with an adhesive layer. The utility model has a novel concept and a simple structure, and a convex mould can be prefabricated according to a concave mould during the use of the quick-assembled embossing mould. The plate assembly is rapid and convenient. Simultaneously, because a high-strength material is used for replacing the traditional plaster, the service life of the quick-assembled embossing mould is effectively prolonged. The time waste and the material waste during the manufacture are avoided, and the cost is reduced. A mould which is made can be used repeatedly. The utility model is a novel mould.

In-line monitoring and prevention control system with stable transient for power system

A self-adaptive emergency control system can continuously update decision table according to real working condition of electric power system, which is locally acquired and received periodically from energy management system. A extended equal area criteria (EEAC) is used for in-line determining emergency control measures to expectant failures and the measures are stored in decision table. When failure occurs, local or regional control measure is searched out from the decision table and is implemented by correspondent controller.

Multi-participant and multi-intelligent-agent hybrid simulation environment construction method for supporting wide energy study

The invention discloses a multi-participant and multi-intelligent-agent hybrid simulation environment construction method for supporting wide energy study, and belongs to the technical field of power system simulation. The multi-participant and multi-intelligent-agent hybrid simulation environment construction method is an environment interaction and modeling method based on a simulation driving mechanism of event, a module interaction mechanism for services and an in-process simulation interrupt method and unifying participants, intelligent agents and mathematical modules. The simulation environment constructed through the method allows application of simulation components of the hybrid intelligent agents, other mathematical algorithms and embodiment objects, the effect that the decision-making power is conditionally transferred between the hosting intelligent agents and the participants so as to coordinate the efficiency and the accuracy can be achieved, and simulation environment developers ...

Computing method for improving small signal stability and providing aid decision making

The invention discloses a computing method for improving small signal stability and providing aid decision making, which is suitable for computation of output power adjustment measures of units for improving a plurality of dampers in weak damping modes under the determined mode of operation. The method is characterized by considering the weak damping modes and the modes close to safe damping threshold while determining the coordination control properties of the units, selecting the units with larger participation factors in the weak damping modes to participate in output power adjustment, dividing the units participating in output power adjustment into two groups according to the unit mode information in each mode, determining the output power adjustment directions of the two groups of units by a method of perturbation of power, determining the output power adjustment directions during coordination control by combining the participation factors and the output power adjustment directions ...

Section data integration method for power system safety and stability online analysis

The invention belongs to the technical field of the power system and automation, which comprises the following steps: 1) calculating impact factor of a generator and a bus on safety and stability of the grid according to the margin and model of safety and stability of the previous operating state power grid; 2) for the power grid (internal grid) under the dispatching jurisdiction, adopting the weight number impact factor of the generator and the bus on safety and stability of the grid to correct weight number measured, performing state estimation to obtain the internal grid section data for security and stability online analysis; and 3) for the power grid (external grid) out of the dispatching jurisdiction, by modifying output power and load of an internal generator of the external gird, ensuring that power flow of a contact line between the internal grid and the external grid is basically constant with the power flow of the internal gird, and adjusted quantity of output power and load ...

Automatic load-reducing control method for integrating the voltage frequency dynamic mutual influence

An Automatic load-reducing control method for integrating the voltage frequency dynamic mutual influence measures the state quantity information on site such as voltage, frequency and power so as to determine whether to act for implementing the load-reducing. The invention effectively takes account of the coupling degree of the voltage amount and the frequency amount under the corresponding operating condition by calculating the average frequency voltage correlation coefficient at the device installation nodes under a certain operating condition; calculating the synthetic state quantity in real time by measuring the voltage, frequency and active power of the installation node of each automatic load-reducing control device in real time and starting the automatic load-reducing control devicein time based on the change circumstance, and acting in turn. The invention introduces the active power measurement into the traditional automatic load-reducing device, takes account of the interaction ...

Self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of power system

The invention discloses a self-adaptive dynamic equivalence method for transient rotor angle stability online analysis of a power system. The invention belongs to the power system and automation technique fields. The method comprises the following steps of: calculating a detail degree index of dynamic equivalence carried out on the power system according to a transient rotor angle stability mode of the power grid after a certain expected failure under the power grid operation condition of the previous round, and the change of the current power grid operation condition relative to the power grid operation state of the previous round; carrying out the coherent equivalence on the generator of the rest generator group, the participation factor of which is less than the dynamic equivalence index, in the transient rotor angle stability mode of the failure; remaining nodes from which the electrical distances to other generators and the failure element are less than a set value and the branches ...

Non-failure valve tripping criteria recognizing breaking point based on local measurement

The invention discloses a fault-free tripping operation criterion based on local measurement to identify the distance between an opening point and a breakpoint. The fault-free tripping operation criterion comprises the following steps: firstly, detecting the starting of break variable, recording the starting time, conserving current, power and switch position signal information before starting, detecting the power of 200ms before starting, judging whether current has the rapid drop process or not in the process of disturbing, if switch position signals are detected to disappear in the process of starting, and current is detected to near zero, and judging local fault-free tripping operation after delaying, if current is not near zero, and detecting current, active power, reactive power and positive sequence impedance by a device after starting, if current is stabilized on a lower value, line power flow is totally capacitive reactive power, measured impedance is equal to open-circuit impedance ...

Calculation method for transient-stability load-shedding control validity evaluation indexes of power system

The invention discloses a calculation method for the transient-stability load-shedding control validity evaluation indexes of a power system, belonging to the field of power system and automation technology thereof. On the basis of quantified information of transient safety and stability, a boundary bus set for grouping generator sets in a lead group and residual groups is formed by screening, the grouping boundary bus set is equivalent to a virtual bus, a virtual branch is added based on the equivalent virtual bus, equivalent impedances of each load bus and buses at the two ends of the virtual branch are calculated, grouping identification of each load bus is realized via a grouping discrimination index, participation factors of each generator set of the group to which the load bus belongs are weighted and summed by utilizing the equivalent transadmittance module value of the load bus and a generator bus, and the transient-stability control validity evaluation index of emergency load shedding ...

Injector

The invention discloses an injector. The injector comprises a container with a fan-shaped cross section, a needle and two injection rods, wherein the container is used for storing a liquid; the needle is fixedly connected with the container, and an extension line of the needle passes through a circle center of the container; and the two injection rods pass through the circle center of the container, contact ends of the injection rods are glidingly connected with the inner wall of the container in a sealed manner, handheld ends of the injection rods are used for controlling the contact ends to glide, and the two injection rods are hinged in a sealed manner at the circle center of the container. According to the injector, technical problems that the applied force is too large, the operation time is too long and the labor intensity of an operator is high when the operator injects the high-viscosity liquid.

Conservative principle-based power system online stability analysis section data integrating method

The invention relates to a conservative principle-based power system online stability analysis section data integrating method which belongs to the technical field of power system analysis. The method comprises the following steps of: (1) calculating impact factors of an engine and a bus on the safe stability of a grid according to stability margin and mode obtained by previous online stability analysis; (2) as for a dispatching management grid (inner net), correcting measured weight by adopting the impact factors of the engine and the bus on the safe stability of the grid and carrying out state estimation to obtain inner net section data for online stability analysis; (3) as for a grid outside dispatching management (outer net), confirming the output increase and decrease sequence of theengine and the load increase and decrease sequence according to the impact factors of the engine and the bus on the safe stability of the grid; (4) by adjusting the output and load of outer net engine, ...

Method for identifying element participation factors in transient safe and stable mode of power system

The invention discloses a method for identifying element participation factors in a transient safe and stable mode of a power system, which identifies participation factors of generators and buses in a transient safe and stable mode and provides more detailed quantitative analysis and decision support for power system operation mode adjustment, electricity transmission limit calculation, control decision optimization and the like. The method comprises the following steps: according to transient power angle stable quantitative information given by an expanded equal-area criterion, identifying the participation factors of the generators in a transient power angle stable mode on the basis of the proportional relation between the acceleration kinetic energy or the deceleration kinetic energy of each generator; according to transient voltage safe and stable quantitative information given by a transient voltage safe and stable quantitative analysis method, identifying the participation factors ...

Load transfer decision-making method for global optimal configuration of recovery resources of power distribution network

The invention discloses a load transfer decision-making method for global optimal configuration of recovery resources of a power distribution network. The available power capacity and the distribution of the available power capacity are adjusted by optimizing a load transfer scheme. According to whether load power failure occurs in the load transfer operation process, the load transfer operation process can be divided into load heat transfer and cold transfer: during heat transfer, two electrified areas are arranged in parallel, then loop opening is performed at a proper position to transfer the load from the original electrified area to the other electrified area or other branches of the electrified area, the load is not powered off during the period, and the load is not powered off during the period; the paralleling of the electrified areas of the power distribution network supplied with power by different TBs belonging to the same subarea of the power transmission network belongs to ...

Method for realizing emergency control on frequency and voltage of electric system

The invention relates to a method for realizing the emergency control on the frequency and the voltage of an electric system. On the basis of a bus voltage V, a frequency f, a generator or a load current I of an installing place of a frequency and voltage emergency controller, the emergency state, the measuring loop abnormal state and the load feedback state of the frequency and the voltage of the electric system can be automatically recognized, and the execution of the emergency control action can be correspondingly unlocked or locked. The method introduces the current amount measurement in a traditional controller, and a key problem that the device measuring abnormity and the electric network emergency state can not be correctly distinguished only through the variation rate of the frequency or the voltage can be solved.

Identification method of transient state stable key transmission cross-section of electric power system fault

The invention provides an identification method of transient state power-angle stable key transmission cross-section corresponding to an expected fault, belonging to the field of electric power system dispatching automation. Based on a transient state power-angle stable quantitative analysis theory and method, namely extended equal-area criterion (EEAC), the method identifies the key transmission cross-section corresponding to the expected fault to provide decision support for the electric power system dispatching operation and control. The method comprises the following steps: carrying out a time domain simulation in an expected fault scene based on the operation state, model and parameters of an electric fence; identifying a generator critical group with stable transient state power-angle by EEAC based on simulation track and calculating the participation factor of the generator; calculating the sensitivity to the cross-section components power change caused by the output of each generator ...

On-line analysis and aid decision making method for low-frequency oscillation of electric power system

The invention provides an on-line analysis and an aid decision making method for the low-frequency oscillation of an electric power system. According to information which is measured by a PMU and reflects the dynamic process of a power network, such as electric generator power angle, active power, busbar voltage phase angle, circuit active power, transformer active power, and the like, the invention monitors the low-frequency oscillation event of the power network online, identifies an oscillation mode and a strongly relevant machine set, counts participation factors, recognizes the approximate area of an oscillation center, and offers aid decision making information for restraining the oscillation on time. The invention conquers a problem that the analysis of the low-frequency oscillation is difficult since a power network model and a parameter are not exact, changes a situation that the low-frequency oscillation is lack of monitoring and analyzing method as well as can not be fast reacted ...

Power distribution network parallel recovery sub-region division method, system and device and medium

The invention discloses a power distribution network parallel recovery sub-region division method, system and device and a medium. The method comprises the steps of obtaining a recovery state of each node in a power distribution network power failure scene; constructing a charged region and a recovery sub-region thereof based on the recovery state of each node; judging whether the recovery sub-regions of the electrified regions are overlapped or not, if not, outputting the current recovery sub-region, and if yes, determining an overlapped region and a power failure branch in the overlapped region; compiling a load distribution scheme for recovering the available power of the sub-regions with the overlapping regions; calculating the recovery value of the power failure branch according to the load distribution scheme; removing the removable power failure branch with the minimum recovery value so as to update the power distribution network power failure scene; a returning step: obtaining a ...

Three-segment out-of-step self-adaptive disconnecting method

The invention discloses a three-segment out-of-step self-adaptive disconnecting method. The method utilizes effective rapid detection to judge system out-of-step and accurately measure criterions of an oscillation center, and performs disconnecting judgment in three segments according to whether the oscillation center is in a protection scope of a device-installing position during the out-of-step, thus an out-of-step disconnecting device can perform self-adaptive judgment for disconnection as a relay protection device so as to provide convenience for setting fixed values of users and adapt to the changes of system modes. Therefore, the out-of-step disconnecting device as a third defense line of a power system can rapidly and accurately act so as to guarantee the safe steady operation of the power system.

Weight pulls hammer stores pylon and weight pulls hammer

The utility model belongs to the technical field of medical instrument, a weight pulls hammer stores pylon and weight pulls hammer is disclosed. The weight pulls the hammer stores pylon and includes the bottom tray, be provided with anticreep axis made of iron on the tray of bottom, the centraxonial upper end of anticreep is fixed with the one end of a chain, the other end of chain is provided with the couple, epaxial being provided with rather than forming the magnet spool in the anticreep, bottom tray, chain, couple are provided with insulating cover outward, the footpath that the weight drew the hammer upwards is provided with the fluting of " S " font, the center that the weight pull the hammer has the round hole that link up from top to bottom, and this round hole communicates with the fluting of " S " font, outside that the weight pull the hammer is provided with pulls the insulating cover of hammer rather than what suit. This weight pulls the hammer and is difficult for droing, and ...

Identification method of transient state stable key transmission cross-section of electric power system fault

The invention provides an identification method of transient state power-angle stable key transmission cross-section corresponding to an expected fault, belonging to the field of electric power systemdispatching automation. Based on a transient state power-angle stable quantitative analysis theory and method, namely extended equal-area criterion (EEAC), the method identifies the key transmissioncross-section corresponding to the expected fault to provide decision support for the electric power system dispatching operation and control. The method comprises the following steps: carrying out atime domain simulation in an expected fault scene based on the operation state, model and parameters of an electric fence; identifying a generator critical group with stable transient state power-angle by EEAC based on simulation track and calculating the participation factor of the generator; calculating the sensitivity to the cross-section components power change caused by the output of each generator ...

Design method for judging out-of-step separation based on in-place active/idle work variable quantity

The invention discloses a design method for judging out-of-step separation based on active/reactive variants in-situ. When the mechanical accelerated power of the system exceeds the electric braking power, if the electric braking power continuously reduces while the phase angle continuously increases, the unit is further accelerated and the out-of-step occurs, thus the time is the critical out-of-step time of the system. The design method of the invention is based on principle of conservation of energy and can achieve the safe and reliable out-of-step separation control of the power system in-situ with fast action, thereby preventing power system stabilization destruction and large area blackout caused by emergent events.

Power system temporary stability and thermal stabilization cooperativeness emergency control method

A power system transient stability and thermal stability coordination emergency control method, includes the following steps: (1) computing the integration sensitivity index of the optional measurement of the thermal stability emergency control and computing the thermal stability emergency control strategy based on the index; (2) checking the transient stability after implementing the thermal stability emergency control strategy, if true, the thermal stability emergency control strategy is used as the coordination emergency control strategy and the computation stops; else, searching the transient stability control strategy; (3) checking the thermal stability after implementing the thermal stability emergency control strategy, if the thermal stability of the electric network comes up to the standard, the computation stops; else switching to the step (1). The invention solves the stability problem meanwhile advances the margin of other stability, enhances the efficiency of the next solution ...

射频环回测试方法及系统和环回测试本振提供方法及装置

Energy transition decision support method based on technology-economy-real participant-computer agent interactive simulation