Capacitor Capacity Decomposition into TCSC and FSC Components

To better suppress resonance phenomena in power systems, we decomposed the capacitor capacity into two components – TCSC (Thyristor Controlled Series Capacitor) and FSC (Fixed Series Capacitor) – and established a TCSC+FSC simulation model for subsynchronous resonance (SSR) suppression characteristics. The simulation study implemented a modular approach using power system blockset components, where TCSC control logic was programmed with variable firing angle algorithms while FSC provided fixed capacitive compensation. Through simulations conducted with different parameter configurations, we investigated both the effectiveness of TCSC+FSC in suppressing various SSR modes and its characteristics under different firing angles. These simulations employed eigenvalue analysis and time-domain simulation methods to assess system stability. The research yielded significant conclusions, such as identifying specific firing angles that provide optimal suppression effects under certain conditions. These findings offer valuable guidance for power system design and optimization, and we hope this research contributes to enhanced stability and efficient development of power systems through implementable control strategies.