Abstract

Abstract In this paper an innovative UPFC damping control strategy based on time-domain analysis of the system transient energy function (TEF) is proposed to damp low frequency electromechanical power oscillations. Comprehensive computer simulations are carried out to verify the proposed control scheme. The control effectiveness of using a combination of different control modes in the UPFC system with respect to different input signals to improve the transient performance of power systems is investigated and discussed. Simulation results show that the proposed damping control strategy is extremely effective and the UPFC is able to provide flexible control functions required for the real-time power flow regulation and fast transient control of power systems.

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