CN-121997587-A - Fault calculation scene setting method for analyzing reliability of protection system

CN121997587ACN 121997587 ACN121997587 ACN 121997587ACN-121997587-A

Abstract

The invention discloses a fault calculation scene setting method for analyzing the reliability of a protection system, which belongs to the technical field of relay protection of power systems, and constructing a primary equipment state set containing all primary equipment fault states in the power grid and a secondary equipment state set combined by all secondary equipment operation states of the power grid relay protection system, and further combining to obtain a fault calculation scene set for analyzing the reliability of the protection system. The method of the invention considers the running state of the secondary equipment of the power grid and the actual condition of the power grid, establishes a fault calculation scene set capable of comprehensively and truly reflecting the running condition of the power grid, comprises all simulation scenes for evaluating the action behavior of the protection system under specific fault working conditions, and can quantify the reliability of the fault response of the protection system through the action behavior result of the protection system under the preset fault calculation scene.

Inventors

WEN MINGHAO
ZHANG SHIMING
CHEN YU
Zhang Kaize
XU QINGYUAN
LI CHAO
LI JIAYANG
ZHAO TING
LI YI

Assignees

华中科技大学

Dates

Publication Date: 20260508
Application Date: 20260123

Claims (10)

1. A fault computation scenario setting method for analyzing reliability of a protection system, comprising: constructing a primary equipment state set containing all primary equipment fault states in the power grid; constructing a secondary equipment state set containing all secondary equipment operation state combinations in a relay protection system corresponding to the power grid; Combining the primary equipment state set and the secondary equipment state set to obtain a fault calculation scene set for analyzing the reliability of the protection system; for each failure calculation scene in the failure calculation scene set, the occurrence frequency of the failure calculation scene is the product of the occurrence rate of the failure state of the primary equipment and the occurrence rate of the operation state combination of the secondary equipment in the scene.
2. The fault computation scenario set-up method for analyzing reliability of a protection system of claim 1, further comprising: for any failed primary device, setting the number of secondary devices which are possibly failed in the corresponding secondary device state set within a first preset range; and setting the failure weight of the secondary equipment in the corresponding secondary equipment state set in a second preset range for any failed primary equipment.
3. The method for setting a fault computation scenario for analyzing reliability of a protection system according to claim 2, wherein setting the number of secondary devices that may fail in a corresponding set of secondary device states for any one of the failed primary devices within a first preset range comprises limiting the secondary devices that may fail to a three-level circuit breaker range for the failed primary device for the given failed primary device.
4. The method for setting a failure calculation scenario for analyzing reliability of a protection system according to claim 2, wherein the setting the failure weights of the secondary devices in the corresponding secondary device state set for any failed primary device within a second preset range includes limiting at most two devices to be in a failure state for the secondary devices included in the range of the three-stage circuit breaker, and when two secondary devices fail, the two secondary devices are not directly associated with the same protection apparatus.
5. The fault computation scenario set-up method for analyzing reliability of a protection system according to claim 3 or 4, wherein the three-stage circuit breaker comprises: the first-stage breaker is a breaker directly connected with the fault primary equipment; the second-stage circuit breaker is a circuit breaker connected with primary equipment directly adjacent to the failed primary equipment except the circuit breaker in the first-stage range; And the third-stage circuit breaker is a circuit breaker which is connected with primary equipment directly adjacent to the primary equipment in the range of the second-stage circuit breaker except for the circuit breaker in the range of the second-stage circuit breaker.
6. The fault computation scenario set-up method for analyzing reliability of a protection system according to claim 1, wherein the next device fault state occurrence rate in each fault computation scenario is a product of a primary device fault rate and a corresponding fault state occurrence probability.
7. The fault computation scenario set-up method for analyzing the reliability of a protection system according to claim 1, wherein the probability of occurrence of a combination of the operating states of the secondary devices in each fault computation scenario is a product of the probabilities of states corresponding to all the operating states of the secondary devices.
8. A failure calculation scene setting apparatus for analyzing reliability of a protection system, comprising: the system comprises a construction module, a relay protection system, a power grid management module and a control module, wherein the construction module is used for constructing a primary equipment state set containing all primary equipment fault states in the power grid; the combination module is used for combining the primary equipment state set and the secondary equipment state set to obtain a fault calculation scene set for analyzing the reliability of the protection system; for each failure calculation scene in the failure calculation scene set, the occurrence frequency of the failure calculation scene is the product of the occurrence rate of the failure state of the primary equipment and the occurrence rate of the operation state combination of the secondary equipment in the scene.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.

Description

Fault calculation scene setting method for analyzing reliability of protection system Technical Field The invention belongs to the technical field of relay protection of power systems, and particularly relates to a fault calculation scene setting method for analyzing reliability of a protection system. Background Relay protection is a first defense line of a power system, and when the power system fails, the relay protection system is required to be capable of rapidly and reliably operating, so that the failure is selectively removed, and the failure is prevented from further expanding and threatening the safety and stability of the system. However, due to improper protection setting fit or equipment failure, the protection system may be refused or malfunction, which may further deteriorate the operation condition of the system, and even cause serious accidents such as local power grid instability or breakdown, so that the reliability of the relay protection system needs to be evaluated. The reliability of the relay protection system is reflected in the action behavior result when the power grid fails, and the action performance of the relay protection device under different fault working conditions is different due to the diversity and randomness of the power system faults. Therefore, objective and quantitative analysis is required to be carried out on the reliability of the relay protection system, and the primary task is to construct a fault calculation scene capable of comprehensively and truly reflecting the running condition of the power grid. The fault calculation scene of the reliability of the existing analysis protection system only focuses on the fault state of primary equipment in the power grid, including factors such as the type of the primary equipment, the fault position, the fault type, the transition resistance and the like, so that the fault calculation scene reflecting the running risk of the power grid is inaccurate. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a fault calculation scene setting method for analyzing the reliability of a protection system, and aims to solve the technical problem that the fault calculation scene of the reliability of the existing analysis protection system is inaccurate. To achieve the above object, according to one aspect of the present invention, there is provided a fault computation scenario setting method for analyzing reliability of a protection system, comprising: constructing a primary equipment state set containing all primary equipment fault states in the power grid; constructing a secondary equipment state set containing all secondary equipment operation state combinations in a relay protection system corresponding to the power grid; Combining the primary equipment state set and the secondary equipment state set to obtain a fault calculation scene set for analyzing the reliability of the protection system; for each failure calculation scene in the failure calculation scene set, the occurrence frequency of the failure calculation scene is the product of the occurrence rate of the failure state of the primary equipment and the occurrence rate of the operation state combination of the secondary equipment in the scene. Further, the fault calculation scene setting method for analyzing the reliability of the protection system further includes: for any failed primary device, setting the number of secondary devices which are possibly failed in the corresponding secondary device state set within a first preset range; and setting the failure weight of the secondary equipment in the corresponding secondary equipment state set in a second preset range for any failed primary equipment. Further, the number of the secondary devices which can possibly fail in the corresponding secondary device state set of any failed primary device is set in a first preset range, and the method comprises the step of limiting the secondary devices which can possibly fail to the three-level breaker range of the failed primary device for the given failed primary device. Further, setting the failure weight of the secondary equipment in the secondary equipment state set corresponding to any one of the failed primary equipment within a second preset range comprises limiting at most two pieces of secondary equipment contained in the tertiary circuit breaker to be in a failure state, wherein when the two pieces of secondary equipment fail, the two pieces of secondary equipment are not directly related to the same protection device. Further, the three-stage circuit breaker includes: the first-stage breaker is a breaker directly connected with the fault primary equipment; the second-stage circuit breaker is a circuit breaker connected with primary equipment directly adjacent to the failed primary equipment except the circuit breaker in the first-stage range; And the third-stage circuit breaker is a circuit breaker which is c