抄録
The paper presents a hybrid type stability control method based on fuzzy control to improve power system stability. The proposed method consists of a speed deviation input fuzzy controller (F1), an electrical power deviation input analog type PSS (ΔP-type PSS) and a fuzzy judgement mechanism (F2). By using the membership function of the magnitude of speed deviation/acceleration of generator, the following control schemes are considered. If the magnitude is big then the supplementary stabilizing signal computed by F1 is used to damp oscillations as fast as possible, otherwise the output signal of ΔP-type PSS is used to avoid undesireable noise effect due to noisy input signal of the speed deviation of Fl. The proposed control method increases the power system stability greatly, while it is simple to implement. The effectiveness of the method is demonstrated by one machine infinite bus and multimachine model systems.
