Power Quality Improvement using PID based Reference Voltage Compensation with STATCOM

This work introduces new technique named Reference Voltage Compensation in conjunction with STATCOM based on Proportional Integral and Derivative control action which reduces much the transient peak and settling time of the voltage and reactive power output which were still present after application of the statcom. In this work the proposed PID based Reference Voltage compensation has been used to damp out the oscillations of multi-machine power system and regulate the bus voltage at which the STATCOM is connected and maintain the reactive power. The results found for the cases without STATCOM, with STATCOM and STATCOM with RVC has been studied for various load capacities, various load switching timings and faults of different periods at various timings. It has been found that the RVC using PID control concept has proved to have an excellent performance over the other similar techniques in the improvement of power system stability by reducing settling time and peaks of transient oscillation due to faults and load switching and improving pf thereby increased system life.