KNOWLEDGE-BASE FOR AN EXPERT-SYSTEM USED FOR STEADY-STATE SECURITY ANALYSIS

The purpose of this paper is to present a way to acquire some knowledg e for the development of an expert system for security analysis. The p aper discusses principally the problem of security in steady state and especially the problem of overloaded branches. The proposed method is based on a hybrid approach which includes rules and numerical computa tions to evaluate the effect of outages on the power system. The basic idea is to use a systematic analysis of the single contingencies to b uild a knowledge base. In real time the knowledge base is used to perf orm a single contingency analysis around the working point for which t he base case has been calculated. The same knowledge base is also used to carry out a double contingency analysis at the working point for w hich it has been established. Rules are extracted by considering simil arities between the knowledge bases obtained for different characteris tic operating states. An advantage of the proposed method is that, by using filtering, it provides a general way to extract rules for each c ontingency.