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Effects of SSSC and TCSC for enhancement of power system stability under different fault disturbances

ABSTRACT Recent technological advancement in the field of power electronics has led to the development of FACTS controller to improve the power system stability issues. While various FACTS controller assists in mitigation of power system oscillations, Static Synchronous Series Compensator (SSSC) and Thyristor Control Series Compensator (TCSC) are found to be most suitable for the issue. This paper addresses the modelling and operation of SSSC and TCSC controller in a multi-machine environment. In order to test the effectiveness of the controller, various cases of fault conditions are considered. Since Power System Stabilizers (PSS) are presumably present in a large system, its simultaneous operation along with the TCSC and SSSC are envisaged to improve its action. Results are obtained for the system without compensation, with PSS only and PSS assisted TCSC and SSSC controller. The comparison shows that the PSS assisted SSSC controllers mitigates the power system oscillations more rapidly than earlier and thereby enhancing the overall operation of the controller to stabilize the given system effectively.