CONTROL METHOD FOR VARIABLE FREQUENCY TRANSFORMER FAULT RIDE THROUGH CIRCUIT AND RELATED CIRCUIT

Disclosed by the present application are a variable frequency transformer fault ride through circuit and a control method therefor, comprising: pre-processing collected grid voltage, stator interface voltage and rotor interface voltage to obtain a stator voltage direct component and a rotor voltage direct component, and obtaining a first grid voltage frequency and a second grid voltage frequency by means of digital phase-locked loop detection processing; performing reference voltage calculation processing on the stator voltage direct component, the rotor voltage direct component, the first grid voltage frequency, and the second grid voltage frequency to obtain voltage reference values of a first pulse-width modulation (PWM) converter and a second PWM converter; performing control signal acquisition processing on the voltage reference values to obtain a switching signal for controlling the first PWM converter and the second PWM converter. By means of performing voltage compensation when ...

猫草盒

Comprehensive control method for bus voltage of direct-current micro-grid

The invention discloses a comprehensive control method for bus voltage of a direct-current micro-grid, which mainly comprises improved adaptive virtual inertia control, an oscillation suppressor and a voltage compensator, and is characterized in that the improved adaptive virtual inertia control can adaptively adjust the size of a virtual inertia coefficient according to a bus voltage change rate during load disturbance; therefore, the inertia of the system is changed, the inertia power required by the system is released to slow down the change speed of the direct-current bus voltage, a smooth bus voltage transient waveform is obtained, and the dynamic characteristics of the system are improved. On the basis, the oscillation suppressor eliminates the high-frequency oscillation component of the bus voltage, so that the oscillation component of the voltage is prevented from entering a control link to cause the next oscillation of the voltage, and the voltage oscillation is remarkably suppressed ...

ALTERNATING CURRENT-DIRECT CURRENT INTELLIGENT HOME MICRO-GRID COOPERATIVE SYSTEM, AND OPERATION METHOD THEREFOR

Disclosed is an alternating current-direct current intelligent home micro-grid cooperative system, comprising: an alternating current-type electrical energy quality screening modulator (2), a direct current-type electrical energy quality screening modulator (3) and a power cooperative module (1). The alternating current-direct current intelligent home micro-grid cooperative system receives, via the power cooperative module (1), parameters of various buses detected by the electrical energy quality screening modulators, and performs optimal computation, and then controls the electrical energy quality screening modulators to adjust the current, voltage and power of the buses, so as to balance a random fluctuation of new energy generated power, thereby realizing the stable operation of an alternating current-direct current home micro-grid, and solving the technical problem of the impact of an intermittent characteristic of the conventional new energy on a power grid in the prior art, so that ...

Application of MLN4924 in preparation of medicine for treating lupus

The invention discloses application of MLN4924 in preparation of drugs for treating lupus, and belongs to the technical field of drugs. Experiments prove that the MLN4924 remarkably relieves the condition of lupus by promoting apoptosis of in-vivo double-negative T cells and reducing accumulation of the double-negative T cells in vivo, including improvement of the survival rate of lupus mice, reduction of kidney injury, reduction of accumulation of autoantibodies and the level of inflammatory factors, so that the MLN4924 can become a candidate medicine for treating lupus and can be used as a medicine for treating lupus. Great clinical application prospects and values are realized.

Lithium ion battery micro-short-circuit resistance estimation method based on rest recovery effect

The invention discloses a lithium ion battery micro-short-circuit resistance estimation method based on a rest recovery effect, and the method comprises the steps: selecting M lithium ion batteries with the same model and batch, and respectively connecting the M lithium ion batteries with resistors with different resistance values in parallel to form a micro-short-circuit simulation battery; performing intermittent constant-current discharging and intermittent constant-current charging experiments on each micro-short-circuit simulation battery to respectively form a discharging data set and a charging data set; building battery micro-short-circuit resistance BP neural network estimation models under the discharging condition and the charging condition respectively; respectively training and testing the battery micro-short-circuit resistance BP neural network estimation models under the discharging condition and the charging condition by using the discharging data set and the charging data ...

Battle strategy auxiliary training method based on historical tennis game video analysis

The invention provides a battle strategy aided training method based on historical tennis game video analysis, and the method comprises the steps: carrying out the analysis according to a tennis motion track, obtaining a batting track of a fighter and related refined data, and giving an auxiliary suggestion. A two-dimensional tennis track is provided with three-dimensional information by defining single-shot ball return quality, collecting and marking battle data information of a tennis match and rendering colors, a perception information code of the track is obtained through a perception network, and scene memory and semantic memory are generated through a memory network; and corresponding quantized data are added to the generated prediction track of the response network, the prediction track and the actual player return track are confronted, a supervision error is minimized, a prediction response module is continuously optimized, a tennis battle return auxiliary model is formed, historical ...

Grid-connected inverter oscillation suppression strategy based on hybrid damping

The invention discloses a grid-connected inverter oscillation suppression strategy based on hybrid damping, mainly comprising a passive damping circuit module and a voltage and current double closed-loop control module introducing active damping control, the passive damping circuit module comprises a shunt capacitor and a damping resistor, the damping resistor is connected in series with a filter capacitor and then connected in parallel with the shunt capacitor, and the filter capacitor is connected in parallel with the voltage and current double closed-loop control module. Active damping control is introduced into the voltage and current double-closed-loop module, a passive damping circuit and the voltage and current double-closed-loop control introducing the active damping control jointly form hybrid damping control, damping of the circuit is improved, oscillation of the grid-connected inverter is restrained, and therefore the stability of the system is guaranteed.

Direct-current micro-grid multi-energy-storage charge state balancing strategy based on hierarchical cooperative control

The invention discloses a multi-energy-storage state-of-charge balancing strategy for a direct-current micro-grid based on hierarchical cooperative control. The multi-energy-storage state-of-charge balancing strategy mainly comprises a communication layer, a first-stage control layer and a second-stage control layer. In the communication layer, each energy storage unit only needs to exchange information with adjacent communication nodes through a consistency algorithm, the average value information of the energy storage system can be obtained without a central controller, and in the first-level control layer, the droop coefficient of each energy storage unit is adaptively adjusted through the local charge state, the charge state average value of the energy storage system and other information. Charge state balance of energy storage units with different capacities in the direct-current micro-grid is achieved, energy state factors are introduced into the second-level control layer, output ...

Culture dish batch placing and transferring device for biology laboratory

The invention discloses a culture dish batch placing and transferring device for a biological laboratory. The culture dish batch placing and transferring device comprises a device main body, a placing disc and a lifting part. The device body is of a sleeve structure and comprises a first structural ring arranged at the upper end and a second structural ring arranged at the lower end, and no less than 18 connecting pieces are arranged on the first structural ring and correspond to the second structural ring. A movable door is annularly arranged on the first structure, located on the inner side of the connecting part and located at the upper end, of the placing disc; the top end of the lifting part adopts a spiral structure, and a hanging groove structure is arranged at the joint of the lower part and the first structural ring. The problems that the space is occupied when the culture dishes are placed in batches, the number of the manually-transferred culture dishes is limited, the culture ...

Control method of direct current bus voltage compensation device based on capacitor energy storage

The invention discloses a control method of a direct current bus voltage compensation device based on capacitance energy storage. Wherein the direct-current bus voltage compensation device is charged by the device power supply module, and after the direct-current bus voltage compensation device is connected into a direct-current micro-grid bus, the energy stored by the direct-current bus voltage compensation device can slowly release the oscillation peak value of the direct-current bus voltage, so that the aim of maintaining the stability of the direct-current bus voltage, current and power is fulfilled; correspondingly, the controller main body of the DC bus voltage compensation device adopts a main and auxiliary double-closed-loop control mode, a PI control method is used, and a control signal is generated by using a pulse width modulation technology to control the normal work of the DC bus voltage compensation device.

Dynamic compensation method for computing power of edge server of Internet of Vehicles

The invention discloses a dynamic compensation method for the computing power of an edge server of the Internet of Vehicles. The method comprises the following steps: dividing the edge server into a fixed station edge server and a bus edge server; the method comprises the following steps: deploying a fixed site edge server at a fixed site including a roadside unit and a base station; according to historical data, finding out a fixed site edge server with excess load; the method comprises the following steps of: deploying a bus edge server on a corresponding bus in order to meet the vehicle demand of an Internet of Vehicles terminal to the greatest extent; and the bus deployed with the bus edge server dynamically compensates the computing power of the fixed station edge server with excess load through the bus edge server in the driving process. According to the method, the bus-carried edge server is used for dynamically tracking the calculation requirements of urban Internet of Vehicles ...

Energy storage system power distribution strategy based on improved SOC balance

The invention discloses an energy storage system power distribution strategy based on improved SOC balance. The energy storage system power distribution strategy mainly comprises a consistency control module, an improved SOC balance module, a virtual voltage drop balance module, a voltage compensation module and a voltage and current double-loop control module. Through the consistency control module, each energy storage unit only needs to exchange information with adjacent communication nodes, average values of SOC, virtual voltage drop and the like of the energy storage system can be obtained without a central controller, information of local SOC, virtual voltage drop and the like is combined with the average values of SOC and virtual voltage drop of the energy storage system through an SOC equalizer and a virtual voltage drop equalizer, and the consistency of the energy storage system is improved. SOC balance and accurate current distribution of energy storage units with different capacities ...

Under-actuated modular charging gun clamping device

The invention provides an under-actuated modular charging gun clamping device which comprises a clamping arm module, a push rod module, a base module, a visual module, a power supply module and a control module. One end of the clamping arm module is slidably arranged at the bottom of the base module and slides in the length direction of the base module, and the other end of the clamping arm module is used for clamping different types of charging guns; one end of the push rod module is fixedly arranged at the bottom of the base module, and the control module controls the other end of the push rod module to drive the clamping arm module to clamp or release the charging gun; the vision module is fixedly arranged at the top of the base module and is used for positioning the charging gun and the charging port; according to the charging gun clamping device, most of charging guns on the market can be clamped through the under-actuated assembly, stable plugging and unplugging can be achieved, meanwhile ...

Intelligent temperature control grain storage device

The intelligent temperature control grain storage device comprises a supporting frame, a bottom cylinder and a connecting cylinder, the bottom cylinder is fixedly installed at the upper end of the supporting frame, the connecting cylinder is installed at the upper end of the bottom cylinder in a clamped mode, a sealing cylinder is installed at the upper end of the connecting cylinder in a clamped mode, and a fixing rod is fixedly installed in the bottom cylinder; and a supporting pipe is fixedly installed at the upper end of the fixing rod, temperature sensors are fixedly installed on the inner surfaces of the bottom cylinder, the connecting cylinder and the sealing cylinder, and heat preservation layers are fixedly installed in the bottom cylinder, the connecting cylinder and the sealing cylinder. According to the intelligent temperature control grain storage device, a user places the corresponding number of connecting cylinders at the upper end of the bottom cylinder according to the ...

Control method of adaptive harmonic energy suppressor

The invention discloses a control method of a self-adaptive harmonic energy suppressor, which mainly comprises a frequency division oscillation suppressor and a wavelet packet oscillation detector, and is characterized in that the frequency division oscillation suppressor can extract harmonic frequency with relatively large oscillation amplitude in direct current bus voltage, and the harmonic frequency with relatively large oscillation amplitude in the direct current bus voltage is extracted by combining the working characteristics of the harmonic energy suppressor; the harmonic wave of the corresponding frequency can be effectively suppressed, the oscillation of the bus voltage is reduced, and the stability of the system is enhanced. The wavelet packet oscillation detector can decompose and reconstruct a DC bus voltage signal, and can select a harmonic frequency with relatively high harmonic energy as an output reference of the frequency division oscillation suppressor. According to the ...

Method for predicting state of charge of battery through unscented Kalman filtering based on CSO optimization

The invention discloses a method for predicting the state of charge (SOC) of a battery through unscented Kalman filtering based on CSO optimization, and the method comprises the following steps: S1, calculating related parameters which affect the prediction precision when the SOC of the battery is predicted through employing an unscented Kalman filtering (UKF) algorithm; s2, testing the predicted battery, and obtaining urban road cycle condition UUDS data of the predicted battery; s3, optimizing an unscented Kalman filter (UKF) algorithm by adopting a crisscross cross algorithm (CSO); and S4, applying the optimized unscented Kalman filter UKF algorithm to predict the SOC of the battery to obtain a more accurate working state of the battery, thereby prolonging the service life of the battery and improving the use efficiency of the battery. According to the method, the advantages of high convergence speed and high global search capability of the crisscross algorithm are utilized, the optimal ...

Fixed site and mobile unit carrying edge server tight coupling collaborative deployment method

The invention discloses a tight coupling collaborative deployment method for a fixed site and a mobile unit carrying edge server. The method comprises the following steps: dividing a regional map into a plurality of sub-domains; a fixed site edge server is placed in each divided sub-domain, and each fixed site edge server covers the range of the sub-domain where the fixed site edge server is located; establishing a sub-domain-based joint optimization model of the fixed site edge server and the mobile unit carrying edge server; and solving the established sub-domain-based fixed site edge server and mobile unit carrying edge server joint optimization model, thereby obtaining the calculation capacity of the fixed site edge server allocated to each sub-domain and the number of unmanned aerial vehicles scheduled to each time slot of each sub-domain. According to the method, the fixed site edge server and the mobile unit carrying edge server are tightly connected, and coupling optimization is ...

Optimization design method for multiple control parameters of energy storage power station

The invention discloses a multi-control parameter optimization design method for an energy storage power station, and the method comprises the following steps: S1, determining a plurality of control parameters needing optimization design, and building a small signal model of the energy storage power station; s2, according to the small signal model under the droop coefficient change, calculating the characteristic value of the system, ensuring the stability of the system, maintaining the voltage deviation of the direct current bus, and searching a droop coefficient combination with the maximum system stability margin; s3, after the value of the droop coefficient combination is determined, the characteristic value of the system is solved according to the small signal model under the virtual inertia coefficient change, the stability of the system is ensured, and the virtual inertia coefficient combination with the maximum inertia supporting capacity of the system is searched; according to ...