Robust transient stability control using thyristor-controlled series compensation

This paper presents an example of a thyristor-controlled series compensator (TCSC) application for transient stability enhancement of the Montana power system. TCSC capability characteristics are established based on the device current ratings and capacitor ohmic size, and next used in transient stability studies. A transient stability controller is designed to maximize the TCSC effectiveness for the first swing stability enhancement. The concepts of operating and restraint characteristics are presented, and a robust control law is proposed. Transient stability studies are performed for the Montana system, and the benefits of applying the TCSC for the stability enhancement are demonstrated. Design and performance of the TCSC-based transient stability controller are presented.