Analyze of Real Switching Angle Limits in TCSC on Capacitor and Inductor Values and their Selection Factors

Thyristor-controlled series capacitor (TCSC) as one of the most important FACT devices can be used for various purposes such as reactive power compensation, voltage control, dynamic stability improvement and power oscillation damping in power systems. Practical aspects on sizing of TCSC elements must be considered to have the fast and reliable switching from capacitor to inductive region and vice versa which is described in this paper. The influencing factors on TCSC characteristic, the requirements of L and C, practical and exact limits of firing angle are presented by detailed analyzing and simulations. Also exact firing angle limitation and stable thyristor trigger angle are discussed for the first time.