Regional electric network failure diagnosis method based on five-layer and three-region cause and effect rule network

Abstract

The invention discloses a regional electric network failure diagnosis method based on five-layer and three-region cause and effect rule network, which can perform backward reasoning for the protection and on-off action information in an SCADA (supervisory control and data acquisition) system for tracing back failure causes, so as to determine the failure element. And forwarding reasoning is performed for the failure causes to detect the protection of false operation and failed operation and on-off aggregation. The five-layer and three-region cause and effect rule network built in the invention has the characteristics of clear structure and explicit physical meaning and can perform graphical expression, so as to have strong intuitionism and to be convenient to easily understand. The judgment of the protection of false operation and failed operation and on-off is simple and fast by the operations of a plurality of aggregations. In the invention, various candidate reasons are mutually restrained by constructing an action condition layer; and the influences of various failure symptoms at the opposite side of a circuit to the side are reflected by constructing a middle diagnosis auxiliary area, so that the accuracy of failure diagnosis at the side is strengthened.

Description

technical field [0001] The invention relates to the field of power grid scheduling and fault analysis, in particular to a power grid fault diagnosis method. Background technique [0002] Power grid fault diagnosis is to use the protection and switch action information in SCADA, combined with the principle of relay protection to identify faulty components and protection and switches that refuse to operate or malfunction. At present, the power system fault diagnosis methods mainly include expert system, Petri net, optimization analysis method, Bayesian network, D-S evidence fusion and so on. However, in some cases, due to the existence of uncertain factors such as protection and switch misoperation, refusal to operate, and information loss, it is difficult to obtain correct diagnosis results by the above-mentioned fault diagnosis method. [0003] Since the causal rule network can accurately reflect the causal relationship between fault components and fault candidate causes, f...

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Problems solved by technology

[0012] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a regional power grid fault diagnosis method based on a five-layer, three-area causal rule network, so that it overcomes the problems in the prior art that only use the information of this station and are susceptible to one-sided The influence of protection maloperation, the possibility of wrongly judging the normal line as a fault, etc.

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