Optimal Control Strategy using Pseudo-Decentralization for Coordination of Power System Stabilizer and FACTS ina Multi-Machine System

Abstract

The power system stabilizers (PSS) are widely used for damping out the oscillations in alarge power system. The interactions of multiple PSS may adversely affect the system stability, hence,they must be properly coordinated. An optimal control strategy with pseudo-decentralization isproposed for the coordination of multiple PSS. FACTS controllers such as static Var compensator(SVC) and thyristor controlled series compensator (TCSC) are used mostly for improving voltage/reactive power and power flow control. These along with supplementary controllers can also beused for damping out the oscillations in the system. The strategy for coordination of the multiple PSShas also been extended for the coordination of supplementary controllers of SVC and TCSC withPSS. The proposed technique has been tested on 39-bus New England system.