CN-121978579-A - Real-time closed loop test method and system for power system based on cascading failure wave recording file construction

CN121978579ACN 121978579 ACN121978579 ACN 121978579ACN-121978579-A

Abstract

The invention provides a real-time closed-loop test method and a real-time closed-loop test system for an electric power system constructed based on a cascading failure wave-recording file, and belongs to the technical field of real-time closed-loop test of the electric power system; in order to solve the technical problems of low communication efficiency and low test efficiency faced in the remote closed loop test of the secondary protection site of the novel electric power system, a control host loads and analyzes an original wave recording file in a remote COMTRADE format received through a wireless network, acquires time domain characteristic information of a waveform, stores the time domain characteristic information of the original waveform into the wave recording file of a time-frequency matrix and then sends the time domain characteristic information to a playback device, the playback device plays back electric quantity information data based on the original waveform, and the played back waveform data is subjected to data recording by an acquisition channel on one hand and is used for analyzing whether the data output by playback is consistent with the original wave recording file or not, and on the other hand, is transferred to the protection device for fault simulation test; the method is applied to real-time closed loop testing of the power system.

Inventors

QI YU
ZHAO JIN
WANG QIANG
CHENG GANG
FENG JUNJIE
HAN WEIHENG
ZHAO JIE
WANG TING
Feng Ziquan
CHEN DANYANG
GUO WENXUAN
SHI YUXIN
TAO WENBIAO
WANG LIANG
ZHANG ZHI
REN YULU
SONG SHUYONG
LI RUI
CHANG XIAO

Assignees

国网山西省电力有限公司电力科学研究院

Dates

Publication Date: 20260505
Application Date: 20260213

Claims (4)

1. The real-time closed loop test method for the power system based on the cascading failure wave-recording file is characterized by comprising the following test steps: step 1, a control host loads and analyzes an original wave recording file in a remote COMTRADE format received through a wireless network to acquire time domain characteristic information of a waveform, wherein the time domain characteristic information comprises an effective value Peak value Amplitude mutation quantity Frequency variation Phase change Rate of distortion Time of rising edge Time of falling edge Duration of time Storing the time domain characteristic information of the original waveform into a wave recording file of a time-frequency matrix, and then sending the wave recording file to a playback device, wherein the expression of the time-frequency matrix is as follows: ; Step 2, the playback device plays back the electric quantity information data based on the original waveform, the played back waveform data is subjected to data recording by the acquisition channel on one hand and is used for analyzing whether the played back output data is consistent with the original wave recording file or not, and on the other hand, the played back waveform data is transmitted to the protection device to perform fault simulation test; Step 3, performing first authentication discrimination on the played back waveform data: After recording the replayed waveform data, the control host extracts the time domain characteristic information of the acquired waveform to form a time domain matrix P, and compares the similarity of the time domain matrix P with the original waveform information time domain matrix F, wherein the calculation formula of the comparison similarity S is as follows: ; Wherein M is the number of rows of the time domain matrix, and N is the number of columns of the time domain matrix; Is a time domain matrix of the original waveform, The method comprises the steps of acquiring a waveform time domain matrix; Step 4, the control host computer compares the consistency of the tripping outlet position state of the acquisition protection device with a playback test discrimination logic library to realize the authentication discrimination of the waveform playback output closure test; And 5, based on the double authentication discrimination results of the step 3 and the step 4, completing real-time closed loop test discrimination of the power system.
2. The method for real-time closed loop testing of power system based on cascading failure wave record file construction according to claim 1, wherein step 2 carries out failure simulation test by constructing zero crossing point orientation clips and splicing waveforms, and the specific method comprises the following steps: Defining the starting moment of the A-phase voltage waveform of the wave recording file received by the playback device to be recorded as t0, recording the rising zero crossing point of the first wave form as t1, recording the zero crossing point of the second wave form as t2, and setting the wave form corresponding to t2-t1 as a complete cycle M; the tm/t (t 2-t 1) cycles are overlapped forwards at the time of the phase A voltage t1, so that the completion of the simulated reclosing charging of various protection test faults and the stable disappearance of various alarm signals are ensured; And similarly, superposing the waveform files corresponding to the t2-t1 by taking the time t1 as a reference for other voltages and all currents; For continuous playback of a plurality of recorded files, the last waveform rising zero crossing point of the former waveform file is recorded as t3, the first waveform rising zero crossing point of the latter waveform file is recorded as t4, and tn (t 2-t 1) cycles are overlapped between the front waveform and the rear waveform, wherein tn is whole seconds, and the conditions of tn=t4-t 3 are satisfied.
3. The method for real-time closed loop testing of power system based on cascading failure wave-recording file construction according to claim 2, wherein in step 1, the control host specifically adopts multiple channels to transmit the multiple wave-recording files to the playback device in parallel, and the method comprises the following steps: Defining that n wave recording files of a server need to be remotely transmitted and synchronously played back based on a wireless network, and controlling n playback devices by a control host at the same time, wherein the control host is a client, and the playback devices are a server; Firstly, the control host establishes n tcp-based communication links in parallel to ensure that the control host and the playback device are communicated normally; secondly, establishing n waveform file transmission channels based on broadcast messages, and transmitting different wave recording files to n playback devices simultaneously by the broadcast messages; And finally, the playback device analyzes the information of the n received wave recording files, clips and splices the wave recording files, and realizes the rapid transmission and continuous playback of the wave recording files.
4. The test system for realizing the real-time closed loop test method of the power system constructed based on the cascading failure wave-recording file is characterized by comprising a control host, a playback device and a protection device, wherein: The control host establishes an interaction channel with the playback device through a wireless network, and the control host transmits related wave recording files to the playback device through the wireless channel; After analyzing the wave recording file, the playback device plays back and outputs analog quantity signals such as voltage, current and the like and switch quantity signals of the positions of the disconnecting link and the circuit breaker in real time, synchronously collects output signals and performs self-detection, and judges whether the output analog quantity signals and switch position signals are distorted or not; The playback device outputs the analog quantity signal and the switching value signal to the protection device, the protection device analyzes the acquired analog quantity signal and switching value signal, triggers protection action logic of corresponding protection functions and drives action switching value signal deflection, the playback device acquires protection device action switching value signal deflection information, generates short messages and feeds the short messages back to the control host, and the control host completes closed loop automatic test of the protection device based on the acquired electric quantity characteristic signals of the waveform file and the received protection device switching position signals.

Description

Real-time closed loop test method and system for power system based on cascading failure wave recording file construction Technical Field The invention provides a real-time closed loop test method and system for an electric power system based on cascading failure wave recording file construction, and belongs to the technical field of real-time closed loop test of electric power systems. Background Along with gradual adjustment of energy structures and the proposal of double-carbon targets, power grid construction also gradually develops towards the directions of large-scale access of new energy and high penetration of power electronic equipment, along with rapid construction of extra-high voltage alternating-current/direct-current engineering and large-scale access of photovoltaics, wind bands and energy storage, the complexity of a power system is deepened, uncertainty is enhanced, vulnerability is aggravated, novel power grids show new characteristics of bidirectional flow of tide, controlled short-circuit current, distributed power supply voltage support and the like, and the degree and the direction of development of the novel power system must be kept up by related power testing means. For example, as the wind power and photovoltaic duty ratio of new energy in the power system is improved, the fluctuation and intermittence of the new energy cause the cascading failure to be more complex, such as voltage breakdown caused by the off-grid of the new energy, the tripping of the traditional unit is caused, the fault test and maintenance are completed by constructing corresponding cascading failure information, the constructed cascading failure wave recording file contains actual failure data of the new energy after grid connection, such as an off-grid signal of a wind power converter, a low voltage ride-through response signal of a photovoltaic inverter and the like, the real-time closed loop test is carried out based on the file data, the cascading failure resistance of the system after grid connection of the new energy can be verified, and safety guarantee is provided for the improvement of the permeability of the new energy. However, at present, the conventional testing means are difficult to cover the coupling linkage scene of new energy sources-conventional units-loads, and meanwhile, the problems of low communication efficiency and low testing efficiency faced in the remote closed-loop test of the secondary protection site of the novel power system all result in that the transmission and playback of the linkage fault wave recording file are difficult to construct, so that the remote closed-loop test of the power grid cannot be realized. Disclosure of Invention The invention aims to solve the technical problems in the background technology, and adopts the technical scheme that the real-time closed loop test method for the power system constructed based on the cascading failure wave-recording file comprises the following test steps: step 1, a control host loads and analyzes an original wave recording file in a remote COMTRADE format received through a wireless network to acquire time domain characteristic information of a waveform, wherein the time domain characteristic information comprises an effective value Peak valueAmplitude mutation quantityFrequency variationPhase changeRate of distortionTime of rising edgeTime of falling edgeDuration of timeStoring the time domain characteristic information of the original waveform into a wave recording file of a time-frequency matrix, and then sending the wave recording file to a playback device, wherein the expression of the time-frequency matrix is as follows: ; Step 2, the playback device plays back the electric quantity information data based on the original waveform, the played back waveform data is subjected to data recording by the acquisition channel on one hand and is used for analyzing whether the played back output data is consistent with the original wave recording file or not, and on the other hand, the played back waveform data is transmitted to the protection device to perform fault simulation test; Step 3, performing first authentication discrimination on the played back waveform data: After recording the replayed waveform data, the control host extracts the time domain characteristic information of the acquired waveform to form a time domain matrix P, and compares the similarity of the time domain matrix P with the original waveform information time domain matrix F, wherein the calculation formula of the comparison similarity S is as follows: ; Wherein M is the number of rows of the time domain matrix, and N is the number of columns of the time domain matrix; Is a time domain matrix of the original waveform, The method comprises the steps of acquiring a waveform time domain matrix; Step 4, the control host computer compares the consistency of the tripping outlet position state of the acquisition protection device with a playback test discrimin