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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 33. Отображено 33.
10-09-2014 дата публикации

Power system stabilizer coordinative optimization method for improving transporting capabilities of multiple small hydropower stations

Номер: CN104037787A
Автор: LIU YU, ZHAO YONG, WU CHEN, LI LINGFANG, HUANG WEI, ZHANG DAN, CHEN YAN
Принадлежит:

The invention provides a power system stabilizer (PSS) coordinative optimization method for improving the transporting capabilities of multiple small hydropower stations. The method includes the following steps: 1) through transient-state stable time-domain simulation, determining dominant low-frequency oscillation modes restraining the transporting capabilities of the small hydropower stations; 2) through small-interference-stability frequency domain scanning, determining generator sets which take part in the dominant low-frequency oscillation modes; 3) through comprehensive index calculation, determining a set which takes part in PSS parameter optimization; 4) targeting at improving the damping of the dominant oscillation modes of the small hydropower stations, carrying out set PSS parameter coordinative optimization; 5) through the transient stable time-domain simulation, evaluating the improving effect of the transporting capabilities of the small hydropower stations. The PSS coordinative ...

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Номер записи: 1
30-07-2014 дата публикации

Area grid connection cluster primary-frequency-modulation assessment method and system

Номер: CN103954853A
Автор: WU CHEN, ZHANG JIE, FAN LEI, LI LINGFANG, ZHANG DAN
Принадлежит:

The invention discloses an area grid connection cluster primary-frequency-modulation assessment method which includes the following steps: setting an area grid connection cluster; monitoring a power grid unified frequency and an independent frequency of each area grid connection cluster; and calculating a primary-frequency-modulation parameter of the area grid connection cluster according to independent frequency and active power changes of an area power grid connection cluster in which frequency disturbances happen. The invention also discloses an area grid connection cluster primary-frequency-modulation assessment system at the same time.

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Номер записи: 2
11-11-1998 дата публикации

Food modifier

Номер: CN0002296632Y
Автор: ZENG GUOLIANG, LI LINGFANG, JI ZHENGGUANG, GUOLIANG ZENG, LINGFANG LI, ZHENGGUANG JI
Принадлежит: ZHONGHONG MACHINERY CO LTD YAN, ZHONGHONG MACHINERY CO., LTD., YANGZHOU

The utility model relates to a quality modifying device which belongs to the technical field of machinery for food and feed. In the utility model, a double-end helical ribbon is arranged on a main shaft on one end with a material feeding port, and the helical ribbon is connected with and fixed on the main shaft by a screw bolt. The utility model has the advantages that material is propelled continuously, the backflow of steam is prevented, and the modifying quality is improved.

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Номер записи: 3
18-05-2011 дата публикации

Straw briquetting machine

Номер: CN0102059818A
Автор: LINGFANG LI, YULUN ZHU, LI LINGFANG, ZHU YULUN
Принадлежит:

The invention discloses a straw briquetting machine, which belongs to the field of agricultural machinery. The briquetting machine comprises an outer barrel, wherein a feed port is formed above one end of the outer barrel; an annular template component which comprises a plurality of radially-distributed discharge channels is fixedly arranged at the other end of the outer barrel; the outer side of the template component is fixedly connected with a cover plate; the center of the cover plate is connected with a flange shaft through a bearing; the flange shaft comprises a shaft section and a flange plate which are connected with each other; an inner barrel is arranged inside the outer barrel, extends axially and passes through a central hole of the template component; one end of the inner barrel is connected with the conventional system, and the other end of the inner barrel is fixedly connected with the flange plate; the outer circle surface of the inner barrel is provided with a helical ribbon ...

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Номер записи: 4
11-11-1998 дата публикации

Feed granulating machine

Номер: CN0002296629Y
Автор: ZENG GUOLIANG, LI LINGFANG, JI ZHENGGUANG, GUOLIANG ZENG, LINGFANG LI, ZHENGGUANG JI
Принадлежит: ZHONGHONG MACHINERY CO LTD YAN, ZHONGHONG MACHINERY CO., LTD., YANGZHOU

The utility model relates to a feed granulation machine, belonging to the technical field of feed machines. A ring model of the feed granulation machine is matched with and is connected with a feed guiding cone pulley and a rotor end plate, conical surfaces are arranged between the ring model and the feed guiding cone pulley and between the ring model and the rotor end plate, installation accuracy and shear strength can be improved, the service life of connection bolts can be extended, and malfunction and accidents can be reduced.

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Номер записи: 5
26-05-1999 дата публикации

Decoction preparation of packaged medicine-Maxingsangbeisan

Номер: CN0001217192A
Автор: TANG LIANGWEI, LI LINGFANG, LIANGWEI TANG, LINGFANG LI
Принадлежит:

The present invention relates to a Chinese medicine for curing infantile asthma-Maxingsangbei powder bag decoction. It is made up by mainly using the Chinese medicinal materials of ephedra, bitter apricot kernel, mulberry bark, Sichuan fritiallary bulb and licorice, etc. through the processes of crushing, mixing and bagging. As compared with existent medicines for curing infantile asthma it is good in therapeutic effect, short in course of treatment, and has no side effects.

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Номер записи: 6
14-01-2015 дата публикации

Electric power system black start on-line navigation type decision recovery method

Номер: CN104281878A
Автор: LI WENYUN, LIU YAN, ZHU TAO, GU XUEPING, ZHAO CHUAN, LIANG HAIPING, LI LINGFANG, CHEN LIANG, LIANG LING, MA TENGFEI, ZHANG DAN, YE HUA, ZUO ZHIBO
Принадлежит:

The invention relates to an electric power system black start on-line navigation type decision recovery method. According to the method, a background decision optimization quasi real-time base, a system state scanning and identifying module, a target network intelligent generation module, a sequence recovery and operation renewal module, a recovery condition statistics module, an industrial experiment guide module, an artificial assigned recovery request module and a recovery scheme display module are included. By means of the method, the recovery state of a system is tracked in real time by monitoring the running state of the system, and then a navigation type network recovery scheme is put forward. First, a target network is loaded to serve as a reference target for the recovery operation, and then the gap between the current actual system state and the target state is judged according to the recovery state statistics. According to the method, the industrial experiment guidance is taken ...

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Номер записи: 7
28-07-2023 дата публикации

MPC-based electrolytic aluminum load participation power grid frequency modulation control method and system

Номер: CN116505557A
Автор: LIU YANG, LIAO SIYANG, XU JIAN, LI LINGFANG, PI SHANQUAN, SUN PENG, CHEN YIXUAN, XU YONGKUN, ZHANG JIE
Принадлежит:

The invention belongs to the technical field of power system operation and control, and relates to an MPC-based electrolytic aluminum load participation power grid frequency modulation control method and system. Firstly, system output of a sampling interval and a measured value of a system state value are obtained; secondly, predicting an output signal in a prediction time domain, specifically, taking the prediction output as a function of an unknown control signal, taking the existing input, the control signal and the measurement output as known quantities, and performing calculation in a control time domain according to a system model; and finally, on-line optimization is carried out on the objective function of the control signal under a given constraint condition. And obtaining a first control signal control system by using the optimization process, and repeating the optimization process at the next sampling moment until a new measurement value is obtained. Therefore, the method has ...

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Номер записи: 8
26-05-1999 дата публикации

Far-infrared magnetic cap for tonifying brain and intensifying intelligence

Номер: CN0001217220A
Автор: LI LINGFANG, PEI TIANHUI, LINGFANG LI, TIANHUI PEI
Принадлежит:

The far infrared brain-tonifying intelligence-raising magnetic cap comprises cap body, cap lining and magnetic material. It is characterized by that the cap lining is made of functional fibre fabric containing far-infrared emitter, on which are uniformly equipped magnetic pieces. Said invention integrates the magnetic material and far-infrared emission material into one body to make far-infrared ray and magnetic line produce synergistic effect on human body to attain the goal of curing diseases and building up body.

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Номер записи: 9
02-04-2014 дата публикации

Mixed MMC-based mixed direct current power transmission system

Номер: CN103701145A
Автор: XU ZHENG, XU FENG, TANG GENG, LIU GAOREN, LIU SHENG, XUE YINGLIN, WU CHEN, LI LINGFANG, ZHANG DAN, ZHANG JIE
Принадлежит:

The invention discloses a mixed MMC-based mixed direct current power transmission system, comprising a rectifying converter station and an inversion converter station, wherein the inversion converter station adopts a mixed MMC. The direct current power transmission system has the active and reactive decoupling control capacity, can transmit power to a reactive network without the phase change failure risk and has direct current fault self-cleaning capacity; under the condition that a feeding end alternating current system has a fault; the mixed MMC has the capacity of outputting a negative level by using a full-bridge submodule, the direct current voltage output by the system can be reduced under the premise of ensuring the controllability and stability of the system, the direct current voltage can be matched with the direct current voltage of a rectifying station, and the direct current power is maintained to be continuously transmitted; due to the optimization on the number of two types ...

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Номер записи: 10
23-04-2014 дата публикации

MMC (Modular Multilevel Converter) bridge arm equivalent simulation method

Номер: CN103746583A
Автор: XU ZHENG, TANG GENG, LIU SHENG, ZHANG ZHEREN, WU CHEN, LI LINGFANG, ZHANG DAN, ZHANG JIE
Принадлежит:

The invention discloses an MMC (Modular Multilevel Converter) bridge arm equivalent simulation method which is mainly used for solving the defect of a simulation technique during the shutting of an MMC. The method comprises the following steps of 1, obtaining bridge arm operating parameters of the MMC, wherein the bridge arm operating parameters comprise bridge arm current and switch signals S1-S3 of each submodule in a bridge arm; 2, constructing a bridge arm equivalent circuit according to the bridge arm operating parameters, wherein the bridge arm equivalent circuit comprises two equivalent voltage sources, two equivalent resistors, two equivalent diodes and an equivalent thyristor; 3, building an MMC simulation system according to the bridge arm equivalent circuit, and performing simulation on the system. According to the MMC bridge arm equivalent simulation method, the complicated bridge arm circuit in the MMC is effectively equivalent to a simple circuit, the node amount and the corresponding ...

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Номер записи: 11
30-06-2023 дата публикации

Control method and device for electrolytic aluminum load to participate in power grid frequency modulation based on temperature state

Номер: CN116365552A
Автор: LI LIN, LIAO SIYANG, XU JIAN, HE CONG, LI LINGFANG, SUN PENG, YOU GUANGZENG, ZHANG JIE, CHEN SHUMIN
Принадлежит:

The invention relates to a high-energy-consumption load frequency modulation control technology, in particular to an electric power control method for an electrolytic aluminum load to participate in power grid frequency modulation based on a temperature state, a thermometer is adopted to monitor and record the real-time temperature of N units, meanwhile, the real-time yield of electrolytic aluminum is recorded, and N is a positive integer larger than 1; using MATLAB to input two groups of data for fitting, and obtaining a curve and an efficiency coefficient of the electrolytic aluminum yield of the N units along with temperature change; monitoring the initial temperature and the initial electric power at the beginning of frequency modulation, and establishing a revenue maximized objective function by using the initial temperature, the initial electric power and the efficiency coefficient; and solving the electric power of each unit at each moment, and operating according to the solved electric ...

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Номер записи: 12
26-08-2015 дата публикации

Power system grid structure reconfiguration and optimization method based on fuzzy chance constraint

Номер: CN104868465A
Автор: LI WENYUN, LIANG HAIPING, ZHU TAO, GU XUEPING, ZHAO CHUAN, LIU YAN, LI LINGFANG, ZHANG XUELI, LIANG LING, MA TENGFEI, ZHANG DAN, YE HUA, ZUO ZHIBO
Принадлежит:

The invention relates to a power system grid structure reconfiguration and optimization method based on fuzzy chance constraints, which belongs to the field of power system security defense and restoration control. The power system grid structure reconfiguration and optimization method comprises a grid structure reconfiguration and optimization model establishing module and a grid structure reconfiguration and optimization algorithm module. The power system grid structure reconfiguration and optimization method adopts triangular fuzzy variables for representing line operation time and restoration reliability, defines an restoration reliability index for evaluating performance of a target grid structure, considers unit start-up time limit, establishes a grid structure reconfiguration and optimization model based on fuzzy chance constraints under the framework of the fuzzy chance constraints, adopts a solution method of combining fuzzy simulation, a crossed particle swarm optimization algorithm ...

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Номер записи: 13
30-05-2023 дата публикации

Method and system for determining frequency modulation capacity of submerged arc furnace based on voltage regulation and electrode lifting

Номер: CN116191480A
Автор: CAO RONG, LIAO SIYANG, XU JIAN, LI LINGFANG, PI SHANQUAN, SI DAJUN, CHEN YIYI, CHEN SHUMIN, HE YE
Принадлежит:

The invention relates to the field of industrial load demand side management, in particular to a method and system for determining the frequency modulation capacity of a submerged arc furnace based on voltage regulation and electrode lifting. Comprising the following steps: constructing an equivalent circuit model of the submerged arc furnace; data of the submerged arc furnace are collected in real time, and the value ranges of arc resistance and arc reactance in the equivalent circuit model of the submerged arc furnace under the constant voltage are calculated according to the constructed equivalent circuit model; according to the value ranges of the arc resistance and the arc reactance in the equivalent circuit model, determining a first power boundary when the resistance is changed by adjusting the rising and falling of the electrode through the constant voltage, and a second power boundary when the bus voltage is adjusted; and the adjustable frequency modulation capacity of the submerged ...

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Номер записи: 14
27-08-2021 дата публикации

Automatic electronic coil testing machine

Номер: CN214067299U
Автор: LI BIN, LI LINGFANG, 李斌, 李领芳
Принадлежит: SUZHOU TEKEER AUTOMATION EQUIPMENT TECH CO LTD, SUZHOU TEKEER AUTOMATION EQUIPMENT TECHNOLOGY CO., LTD., 苏州特克尔自动化设备科技有限公司

The utility model belongs to the technical field of mechanical automation, and particularly relates to an automatic electronic coil testing machine which comprises a testing box, two supports are connected to the lower side of an inner cavity of the testing box, a conveying device is connected to the upper sides of the two supports, a sliding plate is connected to the right side of the conveying device, and a clamping plate is clamped to the right end of the sliding plate. A sliding rail is arranged on the right side of the lower wall of the inner cavity of the testing box, a sliding block is connected to the interior of the sliding rail, the sliding block is in sliding connection with the inner wall of the sliding rail, a fixing box is connected to the upper side of the sliding block, and the upper left side of the fixing box is fixedly connected with the clamping plate; under the combined action of a through groove, a first telescopic rod, a second air cylinder, a glass plate and a clamping ...

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Номер записи: 15
08-09-2020 дата публикации

Dust removing device of laser engraving machine

Номер: CN0111633329A
Автор: LI LINGFANG
Принадлежит:

The invention relates to the technical field of laser engraving, and discloses a dust removing device of a laser engraving machine. The dust removing device comprises an engraving machine body, wherein the top of the engraving machine body is fixedly connected with a base; one side of the base is movably connected with a cutting head; and the front surface of the base is fixedly connected with a supporting plate. According to the dust removing device, through the mutual cooperation of a dust collection cover, a motor, a suction fan shaft, a suction impeller, a dust collection pipe, a dust discharge pipe and a electrostatic dust collection box, dust can be sucked into the electrostatic dust collection box; Through the mutual cooperation of a fixing rod, a rotating shaft and a fan, the effect that the fan in the dust collection pipe rotates at a high speed along with wind power when the motor is started can be achieved, and meanwhile, the effect that dust sucked into the dust collectionpipe ...

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Номер записи: 16
12-05-2023 дата публикации

Method for electrolytic aluminum load to participate in isolated network frequency modulation based on fuzzy PID

Номер: CN116111614A
Автор: SHI FENGMING, LIAO SIYANG, XU JIAN, LI LINGFANG, DUAN PINGSHENG, CHEN YIXUAN, WU CHEN, HUANG RUN
Принадлежит:

The invention relates to a high-energy-consumption industrial load frequency modulation control technology, in particular to a fuzzy PID (Proportion Integration Differentiation)-based electrolytic aluminum load participating isolated grid frequency modulation method, which comprises the following steps of: establishing an electrolytic aluminum load participating isolated grid frequency modulation model; collecting a system frequency variation f and a frequency change rate df/dt; a fuzzy PID controller is established, and the load capacity needing to be adjusted is calculated; and an electrolytic aluminum load characteristic model is established, and the corresponding control parameter adjustment amount of the electrolytic aluminum load is calculated according to the model so as to adjust the power of the electrolytic aluminum load. According to the method, the fuzzy PID control parameters are automatically adjusted according to the change of the external environment, and the adjusting rule ...

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Номер записи: 17
28-05-2014 дата публикации

Calculating method for short-circuit current on direct current side of MMC-MTDC (modular multi-level converter-based multi-terminal direct-current transmission system)

Номер: CN103825267A
Автор: XU ZHENG, ZHANG ZHEREN, TANG GENG, LIU SHENG, XUE YINGLIN, LI WENYUN, WU CHEN, LI LINGFANG, ZHANG DAN, ZHANG JIE
Принадлежит:

The invention provides a calculating method for short-circuit current on the direct current side of an MMC-MTDC (modular multi-level converter-based multi-terminal direct-current transmission system). The calculating method comprises the steps of (1) calculating an MMC-MTDC direct-current network, and taking calculated steady-state operation current as a steady-state component of the short-circuit current; (2) performing equivalent conversion to obtain an equivalent passive circuit corresponding to an MMC; (3) calculating a fault component of the short-circuit current according to the MMC equivalent passive circuit, a direct-current power transmission line and a fault point direct-current voltage source equivalent calculating network; (4) adding the steady-state component and the fault component to obtain a final short-circuit current calculated result. Therefore, on the premise of guaranteeing the effectiveness, the efficiency for calculating the short-circuit current on the direct current ...

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Номер записи: 18
05-05-2023 дата публикации

Parallel operation transformer identification method based on power flow data

Номер: CN116070425A
Автор: SI DAJUN, LI LINGFANG, CHEN YIXUAN, SUN PENG, YOU GUANGZENG, GAO SHANXUE, CHEN SHUMIN, HE YE
Принадлежит:

The invention discloses a parallel operation transformer identification method based on power flow data, and the method comprises the steps: collecting node and branch information, the branch comprises a transformer branch, and the transformer branch comprises a three-winding transformer branch and a two-winding transformer branch; identifying the bus ID number of each node, and identifying the three-winding transformer branch and the two-winding transformer branch; wherein the buses with the same bus ID number are buses with the same voltage class; and judging whether the three-winding transformer branch and the two-winding transformer branch run in parallel or not in the same model plant station according to the bus ID number on each side of the transformer. According to the method, the parallel operation transformer can be accurately identified in intelligent analysis of a power system, and unnecessary repeated calculation and analysis can be reduced and calculation and analysis efficiency ...

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Номер записи: 19
01-08-2023 дата публикации

Parallel operation line identification method based on power flow data

Номер: CN116522576A
Автор: SI DAJUN, LI LINGFANG, CHEN YIXUAN, SUN PENG, YOU GUANGZENG, GAO SHANXUE, CHEN SHUMIN, HE YE
Принадлежит:

The invention discloses a parallel operation line identification method based on power flow data, and the method comprises the steps: collecting branch information in the power flow data, and enabling branches to comprise a line branch and a transformer branch; node information in the power flow data is collected, and a bus ID number of a node is identified; and judging whether the branches run in parallel or not according to the station numbers and the bus ID numbers of the models on each side of the branches. The method comprises the following steps: firstly, identifying substation information according to node and branch information in power flow data; judging whether the model plant station numbers and the bus ID numbers on all sides of the line are the same or not to judge whether the line runs in parallel or not; according to the method, the parallel operation lines can be accurately identified in intelligent analysis of the power system, and due to the fact that faults of the parallel ...

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Номер записи: 20
12-05-2023 дата публикации

Electrolytic copper load adjustable capacity evaluation method based on load characteristic modeling

Номер: CN116109167A
Автор: LI LINGFANG, CHEN YIXUAN, SUN PENG, LIAO SIYANG, DUAN PINGSHENG, XU JIAN, SI DAJUN, HE CONG, WU CHEN, GAO SHANXUE, PI SHANQUAN, YOU GUANGZENG, HE YE, CHEN SHUMIN, HUANG RUN, ZHENG CHAOMING, LIU MINWEI, YU QIANG
Принадлежит:

The invention discloses an electrolytic copper load adjustable capacity evaluation method based on load characteristic modeling, and the method comprises the steps: building an electrolytic copper load controllable characteristic model according to the production process parameters of electrolytic copper, and obtaining the electrical characteristics of an electrolytic copper load; according to actual data of electrolytic copper production, model parameter identification is carried out by adopting a least square method, and electrolytic copper load controllable characteristic model parameters are obtained; and according to the controllable characteristic of the electrolytic copper load, the adjustable capacity range of the electrolytic copper load power is obtained in combination with production safety constraint conditions. According to the method, a load controllable characteristic model of the electrolytic copper is established based on the technological process of the electrolytic copper ...

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Номер записи: 21
11-11-1998 дата публикации

Material guiding cone pulley for feed granulating machine

Номер: CN0002296630Y
Автор: ZENG GUOLIANG, LI LINGFANG, JI ZHENGGUANG, GUOLIANG ZENG, LINGFANG LI, ZHENGGUANG JI
Принадлежит: ZHONGHONG MACHINERY CO LTD YAN, ZHONGHONG MACHINERY CO., LTD., YANGZHOU

The utility model relates to a material guiding cone pulley for a feed granulation machine, belonging to the mechanical field of feed. The main point of the utility model is that spiral ridges are uniformly arranged axially on the inner ring face of the material guiding cone pulley, and a distance between two spiral ridges is larger than the width of a section of the bottom of each of the spiral ridges. The material guiding cone pulley can enable materials to quickly and uniformly enter into a ring molding roller cavity, and the production efficiency and the granulating quality of granulation machines can be improved.

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Номер записи: 22
14-01-2015 дата публикации

Novel fault diagnosis method based on information fusion

Номер: CN104281899A
Автор: LIU YAN, LI WENYUN, GU XUEPING, ZHU TAO, LIANG HAIPING, ZHAO CHUAN, WEN QINGFENG, LI LINGFANG, ZHANG LINBO, ZHU YUQI, ZHANG DAN, CHEN FEI, DING SHIMING, ZHU YE
Принадлежит:

The invention relates to a novel fault diagnosis method based on information fusion, and belongs to the technical field of power grid fault diagnosis. According to the method, a suspected fault set obtaining module, a switch layer fault diagnosis module, an electrical layer fault diagnosis module and a diagnosis result decision and display module are included. By means of the method, fault diagnosis is carried out by combining switching value and electric quantity information according to captured warning information, and therefore fault elements are diagnosed. A suspected fault set is diagnosed according to the logical relationship of protection configuration and actions, and protection and breaker action reliability is added to elements in the suspected fault set on the basis of a classical optimized fault diagnosis model based on the switching values, so that the relative fault degrees of all lines are obtained; wavelet analysis is carried out on electrical quantities before and after ...

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Номер записи: 23
11-11-1998 дата публикации

Machine for granulating feed

Номер: CN0002296631Y
Автор: ZENG GUOLIANG, LI LINGFANG, JI ZHENGGUANG, GUOLIANG ZENG, LINGFANG LI, ZHENGGUANG JI
Принадлежит: ZHONGHONG MACHINERY CO LTD YAN, ZHONGHONG MACHINERY CO., LTD., YANGZHOU

The utility model relates to a granular feed granulation machine, belonging to the technical field of feed machines. The granular feed granulation machine comprises a machine body, a motor, a rotor, an auxiliary shaft, a ring mould, a pressure roller, a trigonal belt driving device, a three-wheel synchronization tooth-shaped strip driving device, etc., wherein, the driving auxiliary shaft is arranged on both sides of the rotor in the machine body, the trigonal belt driving device is arranged between the auxiliary shaft and the motor, and the three-wheel synchronization tooth-shaped strip driving device is arranged between the auxiliary shaft and the rotor. The utility model has the advantages of stable running, little shake and low noise.

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Номер записи: 24
06-06-2023 дата публикации

Load power variation calculation method for cutting off electrolytic aluminum rectifier unit

Номер: CN116231663A
Автор: LI LINGFANG, CHEN YIXUAN, LIAO SIYANG, SUN PENG, DUAN PINGSHENG, XU JIAN, GAO SHANXUE, SI DAJUN, WU CHEN, PI SHANQUAN, ZHANG JIE, HE CONG, CHEN YAOWEN, YOU GUANGZENG, CHEN SHUMIN, HE YE, HUANG RUN
Принадлежит:

The invention discloses a load power variable quantity calculation method for removing an electrolytic aluminum rectifier unit. The method comprises the following steps: analyzing a load power-current coupling characteristic of an electrolytic aluminum equivalent topological graph according to the electrolytic aluminum equivalent topological graph; according to the electrolytic aluminum direct current control mode, the variable quantity of the total load direct current after the rectifier unit is cut off is obtained; and according to the electrolytic aluminum load power-current coupling characteristics, obtaining a relationship between a load active power variable quantity and a direct current variable quantity, and obtaining a variable quantity of a load direct current total current. According to the method, the steady-state model for cutting off the multiple parallel rectifier units is established, the variable quantity of the electrolytic aluminum load after the rectifier units are cut ...

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Номер записи: 25
12-05-2023 дата публикации

Electrolytic aluminum FCM clustering method and system considering adjustment capability difference

Номер: CN116108357A
Автор: PENG BINQI, LIAO SIYANG, XU JIAN, LI LINGFANG, PI SHANQUAN, CHEN YIYI, YOU GUANGZENG, CHEN SHUMIN, HE YE
Принадлежит:

The invention belongs to the field of power system operation and control, and mainly relates to an electrolytic aluminum FCM clustering method and system considering adjustment capability difference. Firstly, sample data required by performance evaluation indexes of an electrolytic aluminum energy storage sample i in a time period j participating in frequency modulation are collected, wherein the performance evaluation indexes of electrolytic aluminum energy storage comprise adjustable capacity, adjustment precision and adjustment rate; inputting the adjustable capacity, the adjustment precision and the adjustment rate of the obtained N groups of samples into a target function of an FCM clustering algorithm; and finally, calculating a target function by adopting an FCM clustering algorithm, and outputting a clustering center and a clustering membership matrix. By adopting the FCM clustering analysis method, the distributed electrolytic aluminum energy storage can be classified, and guidance ...

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Номер записи: 26
09-07-2014 дата публикации

Low-frequency synchronous oscillation source identification method based on oscillating component power direction

Номер: CN103913632A
Автор: ZHAO YONG, WU CHEN, ZHAO BIN, LI LINGFANG, LIU YONGJUN, ZHU TAO, ZHANG DAN, LIU YU, CHEN YAN, LUO YUAN
Принадлежит:

The invention relates to a low-frequency synchronous oscillation source identification method based on the oscillating component power direction. The low-frequency synchronous oscillation source identification method includes the following steps: (1) monitoring low frequency oscillations with the frequency f1 in a power system with the fundamental frequency f0, (2) sampling a voltage at a contact node of a partial power grid and a main power grid and a current which flows through a related contact wire and is injected from the partial power grid to the main power grid, and respectively adopting the digital signal processing technology to obtain components with the frequency f0+f1 and the frequency f0-f1 in the components, and (3) calculating to obtain a sum P of the active power components with the frequency f0+f1 and the frequency f0-f1 of a partial power grid injection system. If the P is larger than 0, it can be judged that an oscillation source exists in the partial power grid. By means ...

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Номер записи: 27
23-06-2023 дата публикации

Phase modifier dynamic reactive power control method based on converter bus voltage stability

Номер: CN116316663A
Автор: LI LINGFANG, CHEN YIXUAN, YOU GUANGZENG, HUANG YING, SI DAJUN, WANG GUOTENG, HE YE, SHEN XUE, CHEN SHUMIN, ZHENG CHAOMING, FU YALU
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The invention discloses a phase modifier dynamic reactive power control method based on commutation bus voltage stability. The method comprises the following steps: controlling an LCC commutation bus through a phase modifier; calculating a reactive power regulation factor of the phase modifier to the self access bus; screening out a phase modifier which has an obvious effect on the voltage stability of the direct-current bus; and additional control of dynamic reactive power control of the phase modifier. According to the converter bus voltage stability-based phase modifier dynamic reactive power control method provided by the invention, the degree of influence between the phase modifier and the direct current system is determined, the phase modifier having great influence on the direct current system is screened out, and then an additional control strategy is given; according to the method, the phase modifier can be effectively utilized to improve the voltage stability of the current conversion ...

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Номер записи: 28
28-01-2015 дата публикации

Method for coordinating and optimizing transmitting capacity of multiple small hydropower station groups based on practical dynamic security region

Номер: CN104319820A
Автор: LIU YU, ZHAO YONG, WU CHEN, LI LINGFANG, HUANG WEI, ZHANG DAN, CHEN YAN
Принадлежит:

The invention provides a method for coordinating and optimizing the transmitting capacity of multiple small hydropower station groups based on a practical dynamic security region. The method comprises the following steps: (1) selecting variables in a critical hyper-plane equation (as shown in the description) in a practical dynamic security region, wherein Pi is the variable of injected active power in a grid, ai is the coefficient of the equation, and n is the number of the variables; (2) solving the coefficient ai of the critical hyper-plane equation; and (3) constructing a multi-small-hydropower-station-group transmitting coordination and optimization model with the critical hyper plane as the constraint condition and solving the equation by a linear programming method. By adopting the method for coordinating and optimizing the transmitting capacity of multiple small hydropower station groups based on a practical dynamic security region, the transmitting capacities of multiple small ...

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Номер записи: 29
21-07-2023 дата публикации

Power grid maximum power transmission capacity calculation method based on consideration of frequency constraint

Номер: CN116470532A
Автор: CHEN YIXUAN, LI LINGFANG, SUN PENG, HUANG YING, YOU GUANGZENG, WU CHEN, WANG GUOTENG, SHEN XUE, LIU MINWEI, HUANG RUN, YU QIANG, ZHOU SHUMING
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The invention discloses a power grid maximum power transmission capacity calculation method based on consideration of frequency constraint. The method comprises the following steps: establishing frequency stability constraint according to frequency characteristics of a multi-direct-current transmission power grid; establishing an optimal scheduling model of the multi-direct-current sending-out power grid based on frequency stability and safe operation constraints; and solving the optimal scheduling model, and calculating the maximum power transmission capacity. According to the method for estimating the maximum power transmission capacity of the multi-direct-current sending-out power grid considering the frequency constraint, the frequency stability constraint of the multi-direct-current sending-out power grid is theoretically deduced and described through a multi-direct-current sending-out power grid optimization scheduling model considering the frequency stability constraint, the problem ...

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Номер записи: 30
30-05-2023 дата публикации

Electrolytic aluminum load participation peak regulation control method and system considering auxiliary service income

Номер: CN116191450A
Автор: QIU RISHENG, LIAO SIYANG, XU JIAN, LI LINGFANG, PI SHANQUAN, DUAN PINGSHENG, CHEN YIYI, SI DAJUN, WU CHEN
Принадлежит:

The invention relates to an electrolytic aluminum load participation peak regulation control method and system considering auxiliary service income. The method comprises the following steps: firstly, sequentially constructing an electrolytic aluminum load model and a power fluctuation model thereof, a power system daily load curve model and an electrolytic aluminum load income model; then constructing an objective function based on auxiliary service benefits and constraint conditions according to the model; and finally, collecting real-time data of the electrolytic aluminum load, optimizing the power system according to the constructed objective function and constraint conditions, and outputting corresponding optimal power configuration. By adopting the method, the electricity consumption cost of the electrolytic aluminum load can be effectively reduced, the income of an electrolytic aluminum enterprise is improved, and the total economic benefit of load-network-source is improved.

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Номер записи: 31
16-05-2023 дата публикации

Power grid frequency modulation method and system based on cooperation of electrolytic aluminum and polycrystalline silicon

Номер: CN116131292A
Автор: ZHOU HAOJIE, LIAO SIYANG, XU JIAN, PI SHANQUAN, LI LINGFANG, CHEN YIXUAN, SI DAJUN, HUANG RUN, ZHU JUEPEI
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The invention discloses a power grid frequency modulation method and system based on cooperation of electrolytic aluminum and polycrystalline silicon, and belongs to the field of power system dispatching and power grid frequency modulation, and the method comprises the steps: obtaining an active power vacancy from a power grid dispatching part; calculating the adjustable capacity of the active power of the electrolytic aluminum load; calculating the adjustable capacity of the active power of the polycrystalline silicon; drawing a curve graph of the cost of the electrolytic aluminum and the polycrystalline silicon and the adjusted power, calculating a derivative value of the curve when the electrolytic aluminum adjusts one power, calculating a derivative value of the curve when the polycrystalline silicon adjusts complementary power, enabling the derivative values to be equal, and solving the adjusted power required by the electrolytic aluminum and the polycrystalline silicon, so as to make ...

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Номер записи: 32
25-03-2015 дата публикации

Power-grid-impact-free detection method for low voltage ride through function of doubly-fed wind turbine generator system

Номер: CN104459540A
Автор: QIAN YINGCHUN, LI LINGFANG, YOU GUANGZENG
Принадлежит:

A power-grid-impact-free detection method for the low voltage ride through function of a doubly-fed wind turbine generator system is characterized in that the stator side of the doubly-fed wind turbine generator system and a power grid are in the off state all the time when the low voltage ride through function of the doubly-fed wind turbine generator system is detected through the detection method, power grid faults of different types and different voltage drop depths are simulated by inputting a reactor with the adjustable resistance value, and the output waveforms of a converter of the doubly-fed wind turbine generator system and all physical quantities of an electric generator are detected so that whether the doubly-fed wind turbine generator system has the low voltage ride through function meeting the requirement of the national standard or not can be judged. By means of the detection method, whether the doubly-fed wind turbine generator system has the low voltage ride through function ...

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Номер записи: 33