CN-122026286-A - Low-voltage switch voltage-loss intelligent reclosing control system and method

CN122026286ACN 122026286 ACN122026286 ACN 122026286ACN-122026286-A

Abstract

The invention relates to the technical field of automatic control of power systems, in particular to a low-voltage switch voltage-loss intelligent reclosing control system and a method, which respectively calculate a fault transient index and a reclosing safety index by collecting electric transient state, switch state, topological environment and historical success rate data, and perform double comparison with a dynamic threshold value to intelligently determine whether reclosing occurs or not; according to the fault transient index dynamic calculation first time coincidence waiting time length, executing closing and adopting post acceleration protection to judge the result, if the first time coincidence fails, merging new data to reevaluate the index, carrying out limited dynamic time delay coincidence attempt, and finally generating a closed loop report, thereby realizing the upgrading of a reclosing strategy from traditional 'timing trial closing' to 'intelligent self-healing', obviously improving the identification and quick recovery capability of transient faults, effectively preventing ineffective coincidence operation of permanent faults, and enhancing the power supply reliability and operation safety of a power line applying the system.

Inventors

ZHANG XUEQIAN
Li Qiangong
Chen tuo
Ye Zhucheng
SHENG YALI
NAN XIAOLONG

Assignees

长城电器集团浙江科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (10)

1. The utility model provides a low-voltage switch decompression intelligence reclosing control system which characterized in that includes: The data acquisition and index calculation module is used for acquiring electrical transient data, switching state data, topological environment data and historical success rate data when the low-voltage switch management circuit to be monitored loses voltage, and respectively calculating a fault transient index and a superposition safety index corresponding to the low-voltage switch management circuit to be monitored; The intelligent reclosing module is used for acquiring a fault transient index threshold value and a reclosing safety index threshold value and evaluating whether the low-voltage switch to be monitored is closed or not; The first closing evaluation module is used for calculating the waiting time of the first closing of the low-voltage switch to be monitored when the low-voltage switch to be monitored is closed, and evaluating whether the first closing of the low-voltage switch to be monitored is successful or not; and the reclosing evaluation module is used for carrying out dynamic reclosing evaluation when the first closing of the low-voltage switch to be monitored is unsuccessful, and outputting a closing report of the low-voltage switch to be monitored.
2. The system for intelligent reclosing control of a low-voltage switch under voltage according to claim 1, wherein the calculating of the fault transient index corresponding to the low-voltage switch management line to be monitored comprises the following specific steps: according to the current waveform and the voltage waveform in the electrical transient data, calculating a current attenuation factor and a voltage recovery factor of a low-voltage switch management line to be monitored; and calculating a fault transient index corresponding to the low-voltage switch management line to be monitored by combining the current attenuation factor and the voltage recovery factor of the low-voltage switch management line to be monitored and the historical success rate.
3. The system for controlling the intelligent reclosing of the low-voltage switch under the voltage loss according to claim 2, wherein the calculating of the coincidence safety index corresponding to the low-voltage switch management line to be monitored comprises the following specific processes: Acquiring a position safety factor corresponding to the low-voltage switch to be monitored according to the position state of the low-voltage switch body to be monitored in the switch state data and an operation locking instruction; according to the voltage state of the corresponding load side of the low-voltage switch management circuit to be monitored in the topological environment data, obtaining the voltage amplitude difference and the voltage phase difference of the two sides of the low-voltage switch to be monitored, and calculating the voltage synergistic factor corresponding to the low-voltage switch to be monitored by combining the maximum amplitude difference and the maximum phase difference corresponding to the low-voltage switch to be monitored; Analyzing external environment factors corresponding to the low-voltage switch to be monitored according to external environment early warning information in the topological environment data; And calculating a fault transient index corresponding to the low-voltage switch management line to be monitored by combining the position safety factor, the voltage synergistic factor and the external environment factor corresponding to the low-voltage switch to be monitored.
4. The system for intelligent reclosing control of a low-voltage switch loss of voltage according to claim 3, wherein the steps of obtaining the fault transient index threshold and the coincidence safety index threshold are as follows: Obtaining a comparison low-voltage switch corresponding to the low-voltage switch to be monitored and a historical voltage-loss event case corresponding to the comparison low-voltage switch, calculating a comparison fault transient index and a comparison coincidence safety index of the corresponding comparison low-voltage switch in the historical voltage-loss event case, and marking the type of each voltage-loss event case in the historical voltage-loss event case; based on each voltage loss event case and the corresponding type, analyzing an initial comparison fault transient index corresponding to each comparison low-voltage switch; Setting an initial contrast coincidence safety index based on a safety priority principle; when the low-voltage switch to be monitored operates, the complete voltage-loss reclosing process of the low-voltage switch to be monitored is recorded as a dedicated case, when the accumulated number of the dedicated cases is larger than the set standard case number, threshold optimization is carried out on the initial comparison fault transient index and the initial comparison coincidence safety index, and the optimized initial comparison fault transient index and initial comparison coincidence safety index are used as a fault transient index threshold and a coincidence safety index threshold which are used subsequently.
5. The intelligent reclosing control system for a low-voltage switch voltage loss according to claim 4, wherein the evaluating whether the low-voltage switch to be monitored is closed comprises the following steps: And evaluating whether the low-voltage switch to be monitored is switched on or not according to the fault transient index and the coincidence safety index corresponding to the low-voltage switch management circuit to be monitored, and the fault transient index threshold and the coincidence safety index threshold.
6. The system for intelligent reclosing control of a low-voltage switch in accordance with claim 5, wherein the calculating of the first closing waiting time of the low-voltage switch to be monitored comprises the following steps: And calculating the first closing waiting time length of the low-voltage switch to be monitored by combining the preset basic waiting time length and the allowable delay time length based on the fault transient index corresponding to the low-voltage switch to be monitored.
7. The intelligent reclosing control system for a low-voltage switch voltage loss according to claim 6, wherein the evaluating whether the first closing of the low-voltage switch to be monitored is successful comprises the following steps: After the first closing operation is executed, the line current passing through the low-voltage switch to be monitored is monitored in real time in a closing monitoring window period with preset duration; And according to the line current monitored in real time, combining a preset protection current setting value, and evaluating whether the first closing of the low-voltage switch to be monitored is successful or not.
8. The intelligent reclosing control system for a low-voltage switch voltage loss according to claim 7, wherein the dynamic reclosing assessment is performed by the following specific procedures: When the first closing of the low-voltage switch to be monitored is judged to be unsuccessful, performing the second closing based on the set maximum allowable reclosing times; Whether the low-voltage switch to be monitored performs secondary switching-on is evaluated again, when the low-voltage switch to be monitored performs secondary switching-on, the secondary waiting time corresponding to the low-voltage switch to be monitored during secondary switching-on is calculated, and whether the secondary switching-on is successful is evaluated; stopping reclosing evaluation until the reclosing frequency exceeds the maximum allowable reclosing frequency or the low-voltage switch to be monitored is successfully closed.
9. The system for intelligent reclosing control of a low-voltage switch in accordance with claim 8, wherein the output of the report of the closing of the low-voltage switch to be monitored comprises the following steps: And when the reclosing frequency is larger than the maximum allowable reclosing frequency or the reclosing frequency is smaller than the maximum allowable reclosing frequency and the corresponding closing is successful, generating and outputting a closing report of the low-voltage switch to be monitored.
10. A low-voltage switch loss-of-voltage intelligent reclosing control method for executing the low-voltage switch loss-of-voltage intelligent reclosing control system according to any one of claims 1-9, comprising the steps of: S1, when a low-voltage switch management circuit to be monitored loses voltage, acquiring electrical transient data, switch state data, topological environment data and historical success rate data, and respectively calculating a fault transient index and a superposition safety index corresponding to the low-voltage switch management circuit to be monitored; s2, acquiring a fault transient index threshold value and a coincidence safety index threshold value, and further evaluating whether the low-voltage switch to be monitored is closed or not; s3, when the low-voltage switch to be monitored is switched on, calculating the waiting time of first switching on of the low-voltage switch to be monitored, and evaluating whether the first switching on of the low-voltage switch to be monitored is successful or not; and S4, when the first switching-on of the low-voltage switch to be monitored is unsuccessful, performing dynamic reclosing assessment, and outputting a switching-on report of the low-voltage switch to be monitored.

Description

Low-voltage switch voltage-loss intelligent reclosing control system and method Technical Field The invention relates to the technical field of automatic control of power systems, in particular to a low-voltage switch voltage-loss intelligent reclosing control system and method. Background The traditional low-voltage switch reclosing adopts fixed delay logic, is difficult to effectively distinguish transient faults and permanent faults, has the risk of equipment damage and fault expansion caused by blind coincidence, and has become an important development trend for improving the self-healing capacity of a low-voltage power supply system along with the general improvement of the requirements of various power users on power supply continuity and the rapid development of intelligent sensing and communication technologies, so as to realize the self-adaptive intelligent reclosing technology based on multi-source information fusion. The existing or traditional low-voltage switch voltage-loss intelligent reclosing control system and method at least have the following technical problems: 1. The existing low-voltage switch voltage-loss intelligent reclosing control system and method lack the capability of carrying out depth feature fusion and quantitative modeling on multi-source heterogeneous data, are mostly dependent on a single electrical quantity criterion or simple time sequence logic, do not systematically and synchronously acquire and analyze electrical transient waveform details, real-time topological connection and synchronous states, mechanical safety locking signals of a switch body and historical success rate data formed by long-term operation, and are incapable of accurately distinguishing transient faults and permanent faults due to the fact that the information is lack of comprehensive processing and forming a composite evaluation index like a fault transient index. 2. The traditional low-voltage switch voltage-loss intelligent reclosing control system and method lack a dynamic threshold optimization function based on historical case statistics and a self-learning mechanism, the decision threshold is a fixed value set according to initial experience, and the decision threshold cannot be dynamically adjusted along with equipment aging, network structure change, operation environment transition and change of fault characteristic distribution due to the fact that the historical case and self-operation case of the same type of equipment are not collected. 3. The existing low-voltage switch voltage loss intelligent reclosing control system and method are obviously lack of self-adaptive delay calculation logic related to a real-time fault possibility evaluation result, reclosing waiting time is usually a preset fixed value or simple step delay, mathematical model association is not established between a delay strategy and the current fault transient probability evaluation result, and a mechanism for dynamically adjusting first and subsequent reclosing waiting time durations according to the real-time evaluated fault possibility is lacked, so that recovery actions are not rapid enough when the high-probability transient fault is faced, power supply continuity indexes are affected, invalid reclosing is performed when the high-probability transient fault is faced, invalid reclosing is possibly performed due to improper setting of waiting time, unnecessary secondary current impact is caused to circuits and equipment, equipment degradation is accelerated, and even accidents are enlarged. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a low-voltage switch voltage-loss intelligent reclosing control system and a low-voltage switch voltage-loss intelligent reclosing control method, which can effectively solve the problems of blind coincidence of fixed delay and insufficient safety existing in the background art. In order to solve the technical problems, the invention provides a low-voltage switch voltage-loss intelligent reclosing control system, which comprises the following steps: the data acquisition and index calculation module is used for acquiring electrical transient data, switching state data, topological environment data and historical success rate data when the low-voltage switch management circuit to be monitored loses voltage, and respectively calculating a fault transient index and a superposition safety index corresponding to the low-voltage switch management circuit to be monitored. And the intelligent reclosing module is used for acquiring the fault transient index threshold and the reclosing safety index threshold and evaluating whether the low-voltage switch to be monitored is closed or not. The first closing evaluation module is used for calculating the waiting time of the first closing of the low-voltage switch to be monitored when the low-voltage switch to be monitored is closed, and evaluating whether the first closing of the low-voltage switch