Improvement of Damping on Multi-machine Power Systems by Thyristor Controlled Series Capacitor with Local Signal

Thyristor controlled series capacitor (TCSC) can improve power system damping This paper proposes a systematic design procedure based on modal analysis for tuning damping controllers of TCSC. The procedure makes it possible to improve damping in multi-machine power systems by using single input and single output TCSC. In this procedure, the influence to the control input signal caused by output of TCSC can be taken into account. This procedure is used to design TCSC controllers to improve power system damping in 3 machine system and its validity is demonstrated through digital simulations.