For improving electric power system transient stability, synchronous generators in power systems are generally equipped with the controllers such as AVR, PSS, and GOV. Since various oscillation modes occur according to system conditions, such fixed controllers deteriorate the control performance.
We propose the adaptive power system stabilizer(PSS) using frequency domain analysis for improving electric power system damping. In the proposed method, at first, the frequency components of the generator's swings are detected by online FFT. The conventional PSS parameters are tuned online by a fuzzy controller based on the frequency domain analysis. We verify that the proposed adaptive PSS using frequency domain analysis can damp the generator's swings effectively.