Performance of Wide-Area based Fuzzy Logic Power System Stabilizer

This paper illustrates the robust performance of a new wide-area based global power system stabilizer (GPSS) using fuzzy logic control design approach. The superiority of fuzzy logic based power system stabilizers is illustrated first by comparing the performance of local conventional stabilizers CPSS with local fuzzy logic based stabilizers (LFPSS). Then an additional control loop is added to include a wide-area based fuzzy logic global stabilizer (GFPSS). Tbe LFPSS uses tbe generator speed deviation and the accelerating power as input signals to provide the stabilizing signals through the excitation systems of the generators to which they are connected to. On the other hand, the GFPSS is designed to act between coherent areas within a power system It uses the difference in the average speed deviation between any two connected coherent areas and the deviation in the tie-line active power transfer between these coherent areas as input control signals. It provides additional stabilizing signals to the generators within these coherent areas. The proposed control scheme is tested using the four machines two-area Kundur test system. The obtained results show the robustness and effectiveness of the proposed scheme in enhancing system stability.