CN-121769800-B - Breaker fault control method and system

CN121769800BCN 121769800 BCN121769800 BCN 121769800BCN-121769800-B

Abstract

The invention discloses a breaker fault control method and system, which are characterized in that the multi-source sensing data of each operation stage of a disconnecting link of a target breaker in the opening and closing process is obtained, the main data characteristics of the multi-source sensing data of each operation stage are extracted, the coupling strength of each operation stage is determined, so that an operation stage fault state transition model is constructed to represent the propagation path and probability distribution of faults among each operation stage, the state transition probability of the faults of the target breaker in each operation stage is updated by combining the multi-source sensing data of the current operation stage of the target breaker, the occurrence stage of a precursor fault is identified according to the state transition probability of each operation stage, the occurrence stage of the precursor fault is further used as a fault suppression starting point, the control parameters of the target breaker in each operation stage are optimized according to the propagation path of the faults among each operation stage, the precursor sensing and identification of the faults are realized, and the robustness of fault control is improved.

Inventors

WANG ZHIWEI

Assignees

北京北元电器有限公司

Dates

Publication Date: 20260508
Application Date: 20260303

Claims (10)

1. A circuit breaker failure control method, comprising: Acquiring multi-source sensing data of each operation stage of a disconnecting link of a target circuit breaker in the opening and closing process, wherein the operation stages comprise a preparation stage, an energy storage stage, an opening and closing execution stage and a locking reset stage; Extracting main data characteristics of multi-source sensing data of each operation stage, and determining coupling strength of each operation stage according to each operation stage and the main data characteristics of each operation stage; Constructing an operation phase fault state transfer model according to the main data characteristics and the coupling strength of each operation phase and each operation phase, wherein the operation phase fault state transfer model is used for representing the propagation path and probability distribution of faults among the operation phases; Based on the operation phase fault state transition model, updating the state transition probability of the fault of the target circuit breaker in each operation phase by combining multi-source sensing data of the current operation phase of the target circuit breaker, and identifying a pre-fault occurrence phase according to the state transition probability of each operation phase; And optimizing the control parameters of the target circuit breaker in each operation stage according to the propagation path of the fault between the operation stages by taking the pre-fault generation stage as a fault suppression starting point until the state transition probability of each operation stage meets a preset safety threshold value, and stopping optimizing the control parameters of each operation stage.
2. The circuit breaker failure control method of claim 1, wherein the multisource sensed data of the preliminary stage includes coil excitation current and control loop voltage, the energy storage stage includes energy storage pressure and motor speed, the execution stage includes arc intensity, contact displacement and main loop current, the lockout reset stage includes lockout position signal and reset spring force; The extracting the main data characteristics of the multi-source sensing data of each operation stage, and determining the coupling strength of each operation stage according to each operation stage and the main data characteristics of each operation stage, includes: Extracting a plurality of time domain features and a plurality of frequency domain features of the multi-source sensing data of each operation stage; performing principal component analysis on the time domain features and the frequency domain features of each operation stage to obtain principal component features of each operation stage; determining fault identification of each principal component feature according to a plurality of principal component features of the operation stage aiming at the operation stage; Determining main data characteristics of each operation stage according to the fault identification, wherein the fault identification of the main data characteristics is larger than a preset fault identification threshold; performing standardization processing on the main data characteristics of each operation stage to obtain standardized main data characteristics of each operation stage; And determining the coupling strength of each operation stage according to the standardized main data characteristics of each operation stage.
3. The circuit breaker failure control method of claim 2, wherein the determining the coupling strength of each of the operational phases based on the normalized main data characteristics of each of the operational phases includes: for any two operation phases in the operation phases, determining mutual information, phase synchronization degree and fault propagation probability of the two operation phases according to main data characteristics of the two operation phases; Respectively normalizing the mutual information, the phase synchronization degree and the fault propagation probability of the two operation stages, and carrying out weighted summation calculation on the normalized mutual information, the normalized phase synchronization degree and the normalized fault propagation probability to obtain the coupling strength of the two operation stages; and determining a coupling strength matrix of each operation stage according to the coupling strengths of every two operation stages, wherein elements in the coupling strength matrix represent the coupling strengths of every two operation stages.
4. The circuit breaker failure control method of claim 1, wherein said constructing an operational phase failure state transition model based on each of said operational phases and said primary data characteristic and said coupling strengths of each of said operational phases comprises: Based on a directed graph topological structure, taking each operation stage as a node, taking a fault propagation path among the operation stages as a directed edge, and mapping the coupling strength among the operation stages into the weight of the directed edge to construct a directed fault propagation graph, wherein the fault propagation path is determined according to the numerical value magnitude relation of the coupling strength among the operation stages; constructing a Gaussian fault membership function of each operation stage according to the main data characteristics of each operation stage; and taking the directed edge topology of the directed fault propagation diagram as fault propagation path constraint, outputting the fault confidence of each node by combining the Gaussian fault membership function, and correcting the fault confidence of each node according to the coupling strength between the operation stages to obtain an inter-stage state transition probability function as the operation stage fault state transition model.
5. The circuit breaker failure control method of claim 4, wherein updating the state transition probabilities of the failure of the target circuit breaker at each of the operation phases in conjunction with the multi-source sensor data of the current operation phase of the target circuit breaker based on the operation phase failure state transition model, and identifying a pre-failure occurrence phase based on the state transition probabilities of each of the operation phases, comprises: acquiring multi-source sensing data of the current operation stage of the target circuit breaker, and extracting current main data characteristics of the multi-source sensing data of the current operation stage; Inputting the current main data characteristics into the operation stage fault state transition model, and updating the fault confidence and state transition probability of each node; and determining the operation phase with the highest state transition probability of each operation phase as the pre-fault occurrence phase.
6. The method according to claim 4, wherein optimizing the control parameters of the target circuit breaker in each of the operation stages according to the propagation path of the fault between the operation stages using the pre-failure occurrence stage as a failure suppression start point until the state transition probability of each of the operation stages satisfies a preset safety threshold, comprises: Gradually backtracking along a reverse propagation path of the directed edge topology of the directed fault propagation graph by taking the pre-occurrence stage as a starting point, performing game optimization on control parameters of each operation stage by combining Nash equilibrium constraint on each operation stage which is backtracked step by step; After optimizing the control parameters of each operation stage, updating the state transition probability of the fault of the target circuit breaker in each operation stage; And under the condition that the state transition probability of any updated operation stage is larger than the preset safety threshold, continuing to execute each operation stage traced step by step, performing game optimization on the control parameters of each operation stage by combining Nash equilibrium constraint until the state transition probability of all updated operation stages is larger than the preset safety threshold, and stopping optimization of the control parameters of each operation stage.
7. The circuit breaker failure control method of claim 6, wherein the step-by-step backtracking along the reverse propagation path of the directed edge topology of the directed failure propagation graph starting from the pre-failure occurrence stage, performing game optimization on control parameters of each operation stage in combination with nash equilibrium constraint for each operation stage that is backtracked step by step, comprising: gradually backtracking along a backward propagation path of the directed edge topology of the directed fault propagation graph by taking the precursor fault generation stage as a starting point, and traversing each backtracked operation stage; Aiming at each retrospective operation stage, constructing a control parameter optimization model by taking fault confidence coefficient after control parameter optimization in the operation stage as an optimization target and taking Nash equilibrium constraint and control parameter range constraint as constraint conditions; and optimizing and solving the control parameter optimization model under each operation stage, and determining the optimized control parameters corresponding to the operation stage according to the optimal solution.
8. A circuit breaker failure control system, comprising: The device comprises a data acquisition unit, a control unit and a control unit, wherein the data acquisition unit is used for acquiring multi-source sensing data of each operation stage of a disconnecting link of a target circuit breaker in the opening and closing process, and the operation stages comprise a preparation stage, an energy storage stage, an opening and closing execution stage and a locking reset stage; The coupling strength determining unit is used for extracting main data characteristics of the multi-source sensing data of each operation stage and determining the coupling strength of each operation stage according to each operation stage and the main data characteristics of each operation stage; the system comprises a state transition unit, a fault detection unit and a fault detection unit, wherein the state transition unit is used for constructing an operation phase fault state transition model according to the operation phases and the main data characteristics and the coupling strength of the operation phases, and the operation phase fault state transition model is used for representing the propagation path and probability distribution of faults among the operation phases; The fault occurrence stage identification unit is used for updating the state transition probability of the fault of the target circuit breaker in each operation stage based on the operation stage fault state transition model by combining the multi-source sensing data of the current operation stage of the target circuit breaker, and identifying a pre-fault occurrence stage according to the state transition probability of each operation stage; And the control parameter optimization unit is used for optimizing the control parameters of the target circuit breaker in each operation stage according to the propagation path of the fault between the operation stages by taking the pre-fault generation stage as a fault suppression starting point until the state transition probability of each operation stage meets a preset safety threshold value, and stopping optimizing the control parameters of each operation stage.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, causes the processor to perform the circuit breaker failure control method of any of claims 1-7.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that the computer-readable storage medium has stored thereon computer-executable instructions for performing the circuit breaker failure control method according to any of claims 1-7.

Description

Breaker fault control method and system Technical Field The invention relates to the technical field of power equipment, in particular to a breaker fault control method and system. Background The circuit breaker is core switch equipment of the power system, plays a key role in circuit on-off and fault isolation, and faults of the circuit breaker possibly cause power failure, equipment damage and even safety accidents of the power system, so that accurate diagnosis and effective control of the faults of the circuit breaker are core research directions of intelligent operation and maintenance of the power equipment. The existing breaker fault control method is mainly divided into a data driving type and a linear algorithm type, and fault identification and control are realized in partial simple scenes, but the linear algorithm type method adopts a linear or low-order nonlinear algorithm, is difficult to attach to the nonlinear and time-varying coupling characteristics of the breaker, lacks fault precursor sensing and identification capability, causes fault missing judgment and high misjudgment rate, has weak cross-stage correlation fault identification capability, cannot realize early warning of faults, and meanwhile, the existing breaker fault control strategy does not fully consider the influence of environmental interference, equipment parameter perturbation and multi-source interference, has poor robustness, lacks multi-source interference decoupling capability and is easy to cause secondary faults. Disclosure of Invention The invention provides a circuit breaker fault control method and system for solving the technical problems. The technical scheme of the invention is as follows: In a first aspect, the present invention provides a circuit breaker failure control method, including: Acquiring multi-source sensing data of each operation stage of a disconnecting link of a target circuit breaker in the opening and closing process, wherein the operation stages comprise a preparation stage, an energy storage stage, an opening and closing execution stage and a locking reset stage; Extracting main data characteristics of multi-source sensing data of each operation stage, and determining coupling strength of each operation stage according to each operation stage and the main data characteristics of each operation stage; Constructing an operation phase fault state transfer model according to the main data characteristics and the coupling strength of each operation phase and each operation phase, wherein the operation phase fault state transfer model is used for representing the propagation path and probability distribution of faults among the operation phases; Based on the operation phase fault state transition model, updating the state transition probability of the fault of the target circuit breaker in each operation phase by combining multi-source sensing data of the current operation phase of the target circuit breaker, and identifying a pre-fault occurrence phase according to the state transition probability of each operation phase; And optimizing the control parameters of the target circuit breaker in each operation stage according to the propagation path of the fault between the operation stages by taking the pre-fault generation stage as a fault suppression starting point until the state transition probability of each operation stage meets a preset safety threshold value, and stopping optimizing the control parameters of each operation stage. Preferably, the multisource sensing data of the preparation stage comprises coil exciting current and control loop voltage, the energy storage stage comprises energy storage pressure and motor rotating speed, the execution stage comprises arc intensity, contact displacement and main loop current, and the locking reset stage comprises locking position signals and reset spring force; The extracting the main data characteristics of the multi-source sensing data of each operation stage, and determining the coupling strength of each operation stage according to each operation stage and the main data characteristics of each operation stage, includes: Extracting a plurality of time domain features and a plurality of frequency domain features of the multi-source sensing data of each operation stage; performing principal component analysis on the time domain features and the frequency domain features of each operation stage to obtain principal component features of each operation stage; determining fault identification of each principal component feature according to a plurality of principal component features of the operation stage aiming at the operation stage; Determining main data characteristics of each operation stage according to the fault identification, wherein the fault identification of the main data characteristics is larger than a preset fault identification threshold; performing standardization processing on the main data characteristics of each operation stage t