Dynamic Performance of 48-pulse STATCOM, SSSC and UPFC controller

The paper investigates the dynamic operation of both static synchronous compensator (STATCOM) and static synchronous series compensator (SSSC) based on a new full model comprising a 48pulse gate turn off thyristor voltage source converter for combined reactive power compensation and voltage stabilization of the electrical grid net work. The complete digital simulation of the STATCOM and SSSC within the power system is performed in the MATLAB/ simulation environment using the power system block set (PSB).The STATCOM scheme and the electrical grid network are modelled by specific electrical blocks from the power system block set, while the control system is modelled using simulink.Two controllers for the STATCOM and SSSC are presented in this paper based on a decoupled with voltage and current control strategy. The performance of both STATCOM and SSSC schemes connected to the 500-kv grid are evaluated. The proposed to ensure the stable operation of the STATCOM under various load conditions. it is shown that phase-locked loop(PLL) inherent delay has a great effect on dynamic operation of SSSC and new auxiliary regulator is proposed to enhance the dynamic performance of the SSSC.the proposed control schemes are validated by digital simulation.