Damping controller design of TCSC based on wide-area monitoring and supplement torque components

In this paper, the effectiveness of a Thyristor Controlled Series Capacitor (TCSC) using wide-area measurements to damp oscillations is considered. Based on a small-signal stability analysis of a single-machine infinite bus system with TCSC, a detailed theoretical framework is developed to design a Power Oscillation Damping (POD) controller modulated by a remote input signal. Phasor Measurement Units (PMUs) are used to measure real-time remote signals and transfer them to the TCSC stability control loop. The optimal controller design of the TCSC based on the supplement torque components is determined. Test cases show the improvement of the small-signal stability by using a remote control signal instead of a local one. Furthermore, the results demonstrate the practical application capability of wide-area measurements for the improvement of power system stability.