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발전기 출력을 입력으로 하는 PSSp는 지역모드와 제어모드 댐핑 제공에 우수하며, 발전기 단자주파수를 입력으로 하는 PSSf 는 광역모드와 같은 저주파수 모드에 좋은댐핑 특성을 갖는다. 결정된 제어정수는 무주 P/P 발전시스템이 폐루프를 이루고 동작할 때, 두 개의 PSS 주파수 특성은 중첩이 된다. 이 중첩된 주파수 특성은 0.6Hz∼3.0Hz에서만 가장 큰 0dB 부근의 이득을 갖고, 효과적인 댐핑 토오크가 전력시스템에 제공된다. 그 외의 주파수대에서는 이득이 -20dB이하로 효과가 없다.


- This paper describes the practical tuning method of dual-input PSS and its application to Muju P/P #2 with Proto PSS, which is based on DSP technology and uses both frequency and power. First, the model parameters of generator system used in this paper have been derived from the generator characteristic testing. Then, in the selection of PSS parameters, the Bode plot is plotted in order to tune the PSS's time constants which are able to compensate the phase lagging due to generator and excitation system. In addition, the eigenvalue analysis is also performed for determining a reliable PSS gain, Ks. Finally, the transient stability program has been utilized to verify the safe operation of Proto PSS against the predictable disturbances such as the AVR-step test and generator unloading test. In on-site test, the simulated results have been identically duplicated by implementing AVR step test in Muju P/P #2 with Proto PSS, which has the previously designed PSS parameters.