CN-121978607-A - Protection state self-diagnosis method, system, equipment and storage medium for energy storage variable-current test equipment

CN121978607ACN 121978607 ACN121978607 ACN 121978607ACN-121978607-A

Abstract

The invention discloses a self-diagnosis method, a system, equipment and a storage medium for the protection state of energy storage variable current test equipment, which comprises the steps of injecting a controlled perturbation excitation signal into the input end of a protection link of the energy storage variable current test equipment; the method comprises the steps of synchronously sampling response signals of all levels of functional units in a protection link, carrying out baseline correction on the sampling signals, carrying out in-phase filtering processing on the sampling signals to obtain preprocessing response signals, extracting protection time sequence response fingerprint parameters corresponding to all levels of functional units, carrying out energy calculation on the preprocessing response signals of all levels of functional units to obtain energy characteristic parameters of the protection link, constructing a protection link structure invariant parameter based on the protection time sequence response fingerprint parameters and the energy characteristic parameters, carrying out consistency calculation on the structure invariant parameter and a pre-established structure baseline parameter to obtain structure deviation parameters, and generating a protection state diagnosis result and corresponding link segment identification information.

Inventors

ZHAO LEI
YANG BO
CHENG WENJI
Xi hang
NIU KAI
KANG YING

Assignees

西安西热产品认证检测有限公司

Dates

Publication Date: 20260505
Application Date: 20260324

Claims (10)

1. The self-diagnosis method for the protection state of the energy storage variable flow test equipment is characterized by comprising the following steps of: S1, injecting a controlled perturbation excitation signal into an input end of a protection link of energy storage variable current test equipment; S2, synchronously sampling response signals of all levels of functional units in the protection link, correcting a base line of the sampled signals, and carrying out in-phase filtering processing on the sampled signals to obtain preprocessed response signals; s3, extracting protection time sequence response fingerprint parameters corresponding to each level of functional units based on a time sequence relation between the preprocessing response signals and the perturbation excitation signals; s4, in a time window corresponding to the protection time sequence response fingerprint parameter, performing energy calculation on the preprocessing response signals of each level of functional units to obtain an energy characteristic parameter of the protection link; s5, based on the protection time sequence response fingerprint parameter and the energy characteristic parameter, constructing a protection link structure invariant parameter; s6, carrying out consistency calculation on the structure invariant parameters and the pre-established structure baseline parameters to obtain structure deviation parameters; S7, generating a protection state diagnosis result and corresponding link segment identification information based on the distribution condition of each invariant component in the structure deviation parameters.
2. The method for self-diagnosing a protection state of energy storage variable current testing equipment according to claim 1, wherein each stage of functional units in the protection link comprises a sampling stage, a criterion stage, an isolation stage, a driving stage and an execution stage; baseline correction is carried out on the sampling signal, in-phase filtering processing is carried out on the sampling signal, and a preprocessing response signal is obtained, wherein the method comprises the following steps: Acquiring static level of each level of functional unit when the controlled perturbation excitation signal is not injected, and taking the static level as a base line value; subtracting the corresponding baseline value from the sampling signal of each stage of functional units obtained by synchronous sampling, and eliminating static bias; And carrying out noise reduction treatment on the sampling signal after the static bias is eliminated by using the in-phase filter, and reserving dynamic response components with the same frequency and the same phase as the controlled perturbation excitation signal to obtain a preprocessing response signal.
3. The method for self-diagnosing a protection state of energy storage variable flow test equipment according to claim 1, wherein the protection time sequence response fingerprint parameters comprise a propagation delay parameter, a response form parameter and a stability parameter; Based on the time sequence relation between the preprocessing response signal and the perturbation excitation signal, the protection time sequence response fingerprint parameters corresponding to each level of functional units are extracted, and the method comprises the following steps: calculating the initial change time difference of the preprocessing response signal relative to the perturbation excitation signal as a propagation delay parameter; extracting slope change characteristics of a rising edge and a falling edge of the preprocessing response signal to serve as response morphological parameters; And calculating the fluctuation variance of the preprocessing response signal in the flat-top period as a stability parameter.
4. The method for self-diagnosing a protection state of an energy storage variable flow test device according to claim 1, wherein the step of performing energy calculation on the preprocessing response signals of the functional units of each stage to obtain the energy characteristic parameters of the protection link in a time window corresponding to the protection time sequence response fingerprint parameters includes: determining a time window corresponding to each level of functional unit by taking the starting time and the ending time of the perturbation excitation signal as references and combining propagation delay parameters; performing integral operation on the preprocessed response signals in a time window to obtain response energy values corresponding to each level of functional units; And calculating the ratio of response energy values between adjacent functional units at all stages, constructing an inter-stage energy transfer ratio parameter, and taking the inter-stage energy transfer ratio parameter as an energy characteristic parameter.
5. The method for self-diagnosing the protection state of the energy storage variable flow test equipment according to claim 1, wherein the structure invariant parameter is a one-dimensional vector formed by a propagation delay parameter and an inter-stage energy transfer ratio parameter; Carrying out consistency calculation on the structure invariant parameters and the pre-established structure baseline parameters to obtain structure deviation parameters, wherein the method comprises the following steps: Acquiring a structural baseline parameter obtained by testing a protection link in a healthy state; calculating the difference value between each component in the structure invariant parameters and the corresponding component in the structure baseline parameters to form a deviation vector; Multiplying each component in the deviation vector by a corresponding weight coefficient to obtain a structural deviation parameter, wherein the weight coefficient is preset according to the sensitivity of each component to the protection state.
6. The method for self-diagnosing a protection state of energy storage variable flow test equipment according to claim 1, wherein generating a protection state diagnosis result and corresponding link segment identification information based on a distribution condition of invariant components in a structure deviation parameter comprises: Dividing the structure deviation parameters into a propagation delay ratio class component, an energy transfer ratio class component and a consistency difference class component according to parameter types; sorting the components according to the magnitude of the magnitude, and screening out abnormal components with magnitude larger than a preset threshold value; determining a corresponding function level number or an adjacent function level interval number according to the index position of the abnormal component in the structure invariant parameter; and outputting the function level number or the adjacent function level interval number as link segment identification information, and generating a protection state diagnosis result by combining the amplitude of the abnormal component.
7. The method for self-diagnosing the protection state of the energy storage variable flow test equipment according to claim 1, wherein the controlled perturbation excitation signal is a high-frequency pulse sequence with the amplitude within a preset safety interval; injecting a controlled perturbation excitation signal into an input end of a protection link of the energy storage variable current test equipment, comprising: On the premise of not triggering the real protection action of the protection link, determining a preset safety interval; Generating a high-frequency pulse sequence, and adjusting the amplitude of the high-frequency pulse sequence to enable the amplitude of the high-frequency pulse sequence to fall in a preset safety interval; And injecting the regulated high-frequency pulse sequence as a controlled perturbation excitation signal into the input end of the protection link.
8. The utility model provides an energy storage variable flow test equipment protection state self-diagnosis system which characterized in that includes: The signal injection module is used for injecting a controlled perturbation excitation signal to the input end of the protection link of the energy storage variable-current test equipment; The sampling module is used for synchronously sampling response signals of all levels of functional units in the protection link, carrying out baseline correction on the sampling signals, and carrying out in-phase filtering treatment on the sampling signals to obtain preprocessing response signals; The fingerprint parameter extraction module is used for extracting protection time sequence response fingerprint parameters corresponding to each level of functional units based on the time sequence relation between the preprocessing response signals and the perturbation excitation signals; the energy calculating module is used for calculating the energy of the preprocessing response signals of each level of functional units in a time window corresponding to the protection time sequence response fingerprint parameters to obtain the energy characteristic parameters of the protection link; The invariant parameter construction module is used for constructing the invariant parameter of the protection link structure based on the protection time sequence response fingerprint parameter and the energy characteristic parameter; The consistency calculation module is used for carrying out consistency calculation on the structure invariant parameters and the pre-established structure baseline parameters to obtain structure deviation parameters; The diagnosis module is used for generating a protection state diagnosis result and corresponding link segment identification information based on the distribution condition of each invariant component in the structure deviation parameter.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the energy storage variable flow test device protection state self-diagnostic method according to any one of claims 1 to 7.
10. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the energy storage variable current test apparatus protection state self-diagnosis method according to any one of claims 1 to 7.

Description

Protection state self-diagnosis method, system, equipment and storage medium for energy storage variable-current test equipment Technical Field The invention belongs to the field of power electronics, and relates to a self-diagnosis method, a system, equipment and a storage medium for a protection state of energy storage variable-current test equipment. Background Along with the rapid development of power electronic technology, the energy storage converter system is widely applied in the fields of new energy grid connection, power grid peak regulation, distributed energy utilization and the like, and the energy storage converter test equipment is used as a core device for verifying the performance of the energy storage converter system and guaranteeing the safe and stable operation of the system, so that the reliability and the state monitoring performance of a self protection link become key technical requirements. At present, the state diagnosis of the protection link of the energy storage variable flow test equipment mainly depends on two prior art schemes, namely a passive diagnosis scheme based on fault triggering threshold judgment, wherein the scheme is characterized in that a fixed electrical parameter threshold is arranged at the output end of an execution stage of the protection link, the protection link is judged to be abnormal only when the protection link triggers a protection action due to real faults and an output signal exceeds a preset threshold, the core of the scheme is to reversely deduce the state of the link through a terminal output result, and the scheme is an off-line static detection scheme, wherein the scheme is required to suspend the normal test work of the energy storage variable flow test equipment, power-off disassembly detection is carried out on each stage of functional units of the protection link through an external instrument, the static parameters of each unit are collected, and whether the unit fails or not is judged by comparing with standard parameters. However, the prior art can only passively respond after the occurrence of a fault or trace back the problem through offline detection, and the requirement of the energy storage variable current test equipment on the real-time monitoring of the state of the protection link is difficult to meet. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a self-diagnosis method, a system, equipment and a storage medium for the protection state of energy storage variable flow test equipment, so that a protection link can obtain complete propagation delay, response form and stability parameters under the condition of not triggering real protection action, thereby realizing observability of the dynamic response process in the protection link. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: A self-diagnosis method for the protection state of energy storage variable flow test equipment comprises the following steps: S1, injecting a controlled perturbation excitation signal into an input end of a protection link of energy storage variable current test equipment; S2, synchronously sampling response signals of all levels of functional units in the protection link, correcting a base line of the sampled signals, and carrying out in-phase filtering processing on the sampled signals to obtain preprocessed response signals; s3, extracting protection time sequence response fingerprint parameters corresponding to each level of functional units based on a time sequence relation between the preprocessing response signals and the perturbation excitation signals; s4, in a time window corresponding to the protection time sequence response fingerprint parameter, performing energy calculation on the preprocessing response signals of each level of functional units to obtain an energy characteristic parameter of the protection link; s5, based on the protection time sequence response fingerprint parameter and the energy characteristic parameter, constructing a protection link structure invariant parameter; s6, carrying out consistency calculation on the structure invariant parameters and the pre-established structure baseline parameters to obtain structure deviation parameters; S7, generating a protection state diagnosis result and corresponding link segment identification information based on the distribution condition of each invariant component in the structure deviation parameters. Optionally, each level of functional units in the protection link comprises a sampling level, a criterion level, an isolation level, a driving level and an execution level; baseline correction is carried out on the sampling signal, in-phase filtering processing is carried out on the sampling signal, and a preprocessing response signal is obtained, wherein the method comprises the following steps: Acquiring static level of each level of functional unit when the controlled pe