Sectional Compensation Parallel Power System Stabilizer with Two Independent Channels

Power system stabilizer (PSS) is an important tool to depress low frequency oscillation. However, its amplitude-frequency characteristics and phase-frequency characteristic sometimes can´t be harmonious when PSS works in broadband. The question needs to be solved. A two channels parallel PSS model was put forward. By insertion of a serial variant gain aspect in lead and lag part, its amplitude-frequency characteristics of high frequency band could be improved. By adding a branch parallel to primary lead and lag part, phase compensation of low frequency band could be developed. The frequency characteristic of the two channels parallel PSS and the existing PSS model was analyzed. The application effect of the two channels parallel PSS model on actual system was validated by simulation tests using power system analysis software package (PSASP) program. Results were perfect. Study indicated that the two channels parallel PSS model has better adaptability than existing PSS model.