Study on the Feasibility of Widely Usage of PSS in Multi-machine Power System

摘要

WSCC and IEEE have suggested that PSS should be widely used. In China, many PSS have already been used as the inter-connected grid is getting larger. However, the feasibility of Widely Usage of PSS hasn't been proved, as PSS may introduce some negative damping. This paper indicates that PSS mainly transfers the damping from non-electromechanical mode to the electromechanical mode. And one generator's PSS mainly enhances the electromechanical mode's damping associated tightly with the generator, while introducing very little positive or negative damping to the electromechanical mode associated weakly with the generator. Widely Usage PSS's positive effect is much more than the negative effect. As a result, Widely Usage of PSS is feasible.