An approach to design fuzzy IF-THEN rules for fuzzy-controlled static VAr compensator

Abstract

The paper describes an approach to design fuzzy IF-THEN rules for the fuzzy-controlled static VAr compensator (FCSVC) in a three-phase electric power system. In general, designing fuzzy IF-THEN rules for fuzzy-controlled non-linear MIMO systems is very difficult because the system is too complex to obtain the knowledge of experts sufficiently. Therefore, automatic design of the rules from input-output data is studied by many researchers. However, it is impossible to apply the designing method to the FCSVC in a three-phase electric power system because the system is so dynamic and the input-output data are not obtained completely. We propose a FCSVC, the rules of which are designed more easily and more efficiently and depend on the condition of the system. The effectiveness of the approach described in the paper is verified by the experimental results.