Coordination of TCSC and SVC for inter-area stability enhancement

This paper proposes a combination of the TCSC (thyristor controlled series capacitor) and SVC (static VAr compensator) installation to achieve superior performance for enhancing the inter-area stability of a 2-area interconnected 4-machine system. The developed scheme employs a damping controller which coordinates two measurement signals to control the TCSC and SVC. The coordinated control method is based on the application of projective controls. Controller performance when the system is subjected to small and large disturbances is examined. The simulation results show that the proposed feedback strategy with coordinated control of TCSC and SVC provides very good damping to inter-area oscillations. In this paper, a current injection model of TCSC is introduced and included in the transmission system model. By using equivalent injected currents at terminal buses to simulate a TCSC no modification of the bus admittance matrix is required at each iteration