REDUCTION OF SUB - SYNCHRONOUS RESONANCE BY USING PSO BASED PI DAMPING CONTROLLER

When a series compensated long transmission lines connects to a steam - turbine generator, it results in the unfavorable phenomenon called as sub - synchronous resonance (SSR). This effect results in the damage of the turbine shaft which is very dangerous. This paper mainly deals with the reduction of oscillations resulting from SSR in order to protect the steam turbine. Hence sufficient damping controllers should be employed to protect the system to go out of synchronism. For this, simple TCSC and TSSC alone are not sufficient and hence we are going for the PID damping controllers along with the Distributed Static Series Capac itors (DSSC) in order to damp out the oscillations quickly. In this paper, the PID controlled damping controllers are employed along with the DSSC to make the system stable and the simulations are carried out in MATLAB/SIMULINK