Online PSS evaluation based on WAMS/PMU technology

A method of online PSS(Power System Stabilizer) evaluation based on WAMS / PMU technology is proposed and an index integrating the PSS gain and phase precession is given to evaluate the control effect of PSS.The outputs of the evaluated unit and the control outputs of its PSS / excitation are collected by PMU continuously and sent to WAMS via high-speed communication net when low-frequency oscillation occurs.The recorded data are then analyzed by Prony algorithm to obtain the dominant oscillation mode and the outputs of corresponding PSS,as well as the amplitude-frequency and phase-frequency characteristics of corresponding open-loop system,and the evaluation index of each mode is calculated.Simulative experiments are carried out on a two-machine equivalent system and the results verify the effectiveness of the proposed method.