DESIGN AND ANALYSIS OF CONTROLLERS FOR STATCOM APPLICATIONS IN FREQUENCY RESPONSE METHOD FOR REACTIVE POWER COMPENSATION IN LINEAR LOADS

The STATCOM (STATic synchronous COMpensator) is a shunt connected voltage source converter using self-commutating device and can be effectively used for reactive power control. Its principle of operation is similar to that of a synchronous condenser. This paper describes the modeling of STATCOM along with design of current controller and voltage controller. The design of controllers for the converters can be realized in frequency response method. The transfer function of the STATCOM is a first order system and hence root locus and bode plot are plotted to get the parameters of the PI controller. The frequency response approach is adopted and simulated waveforms are presented.