Thyristor-Controlled Series Capacitors (TCSC): Impact on Subsynchronous Resonance (SSR) Bifurcation in Power Systems

This paper aims to investigate the impact of Thyristor-Controlled Series Capacitors (TCSC) on subsynchronous resonance (SSR) bifurcations in power systems. Subsynchronous resonance refers to oscillations in power systems with frequencies below the system frequency, which can cause mechanical vibrations and potential damage to equipment. Therefore, studying methods to eliminate or mitigate SSR constitutes an important research direction in the power system field. The study introduces the fundamental principles of TCSC technology and examines its influence on SSR bifurcations in power systems. Through simulation tools like MATLAB/Simulink, we will evaluate TCSC performance by implementing control algorithms that regulate thyristor firing angles to dynamically adjust series capacitive reactance. Key functions include real-time impedance modulation and damping controller design using phase-locked loops (PLL) for synchronization. The implementation typically involves mathematical modeling of TCSC dynamics using differential equations and state-space representations, with bifurcation analysis algorithms tracking system stability boundaries. The prospects for TCSC applications in power systems will be discussed, focusing on their capability to suppress SSR through adaptive impedance control and stability enhancement mechanisms.