Design of Adaptive TCSC Damping Controller Based on Oscillation Energy Analysis

This paper proposes oscillation energy analysis of inter-area mode oscillations for the investigation of inter-area power oscillations and their effective suppression by the design of a TCSC damping controller. The oscillation energy function developed in this paper can interpret inter-area mode oscillations as a continuous process of conversion between oscillation kinetic energy and potential energy. Based on this interpretation, a scheme of consuming oscillation energy has been developed to design the TCSC damping controller to suppress inter-area mode oscillations. The advantage of this proposed control scheme is that no detailed information about data and configuration of the studied power system is required. To implement the control scheme, only active power flow along the tie line where the TCSC is installed is taken as feedback signal of the TCSC damping controller. It is proposed in the paper that in order to enhance the performance of the damping controller, the control gain is adjusted adaptively in real time according to the magnitude of system oscillations. Simulation results with and without the adjusted-gain adaptive TCSC damping controller in a large interconnected power system are presented in the paper to show the effectiveness and robustness of proposed scheme