OPTIMAL DESIGN OF POWER SYSTEM STABILIZERS CONTROL FOR MONOMACHINE AND MULTIMACHINE USING INTELLIGENT CONTROL TECHNIQUES -FUZZY LOGIC-

The stability of power electrical networks is a key factor for the delivery of high quality energy. A power system stabilizer (PSS) is designed to deliver a supplement excitation signal to a synchronous machine, to limit frequency oscillations. Frequency oscillations are consequences of either modifying the functioning point, or short circuits. Since power systems are highly non-linear systems, with configurations and parameters that change with time, the Conventional power system stabilizers (CPSS) are designed for a single functioning point. Their performances decrease when the functioning point is modified. In this paper, a fuzzy expert system (fuzzy power system stabilizer: FPSS) is designed to limit frequency oscillations of a power electrical network. Only 25 rules (comparatively to 49 rules of other works) were used to assure better performances than CPSS. Simulation tests include varying functioning points and short circuits.

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