Improvement of transient stability of power systems by using UPFC.

Abstract

The aim of this paper is to use an Unified Power Flow Controller (UPFC) for improvement of transient stability margin. Determination of the suitable damping strategy is based on Lyapunov energy function of the power system. The injection model is used for UPFC. A complementary control strategy is proposed to calculate the series injected voltage. The simulation results by using Electromagnetic Transient Program (ATP-EMTP) show that the suggesteld UPFC control strategy improves transient stability of the power system.