Electric power system fault diagnosis method based on equivalent input interference method

Abstract

The invention discloses an electric power system fault diagnosis method based on an equivalent input interference method. The electric power system fault diagnosis method comprises the following steps that S1, the whole electric power system is reasonably layered, group division is performed on the basis of each layer, groups are divided into subgroups and the equivalent power of each group is calculated; S2, the equivalent input interference observer of each group is constructed; S3, the equivalent input interference threshold of the group is solved; and S4, the change situation of the equivalent input interference observer of the group is downwardly observed layer by layer, the fault occurs through judgment if the situation that the value exceeds the equivalent input interference threshold in a certain time period occurs, detection is downwardly performed to the bottommost subgroup and the concrete node of the fault is determined and location judgment of the fault is realized, monitoring is continued if the situation of exceeding the threshold does not occur, and the subgroups of the groups of which the values do not exceed the threshold are not detected. The defects of the conventional corresponding fault diagnosis method based on the protection device and circuit breaker information can be avoided, fault diagnosis time is short and precision is high.

Description

technical field [0001] The invention relates to a power system fault judgment method based on an equivalent input interference method, more precisely, relates to a method for directly using basic electrical quantities in a power system to carry out fault judgment. Background technique [0002] Power system fault diagnosis is an important technology to maintain the stability of the power system. Quickly and accurately judging the faults in the system is the basis for dealing with the faults in the next step, which is the requirement of fault diagnosis. [0003] At present, power system fault diagnosis mainly includes some corresponding methods such as expert knowledge system, Petri net, genetic algorithm, multi-agent technology, etc. They mainly rely on the information of protection devices and circuit breakers in the system, and have two main defects: [0004] 1) In the case of sensor failure, the accuracy of fault diagnosis will be seriously affected due to the lack of comp...

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Problems solved by technology

[0007] In view of this, in order to solve the technical problem of long and low-precision power system fault diagnosis in the prior art, the present invention proposes a power system fault judgment method based on the equivalent input interference method, which can only rely on the basic electrical quantity in the power system The equivalent input disturbance layered fault diagnosis method for fault diagnosis is of great significance to the improvement of power system fault diagnosis

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