Research on the synchronous voltage reversal control model of TCSC

The IEEE first benchmark system with a combination of fixed series compensation and Thyristor controlled series compensation (TCSC) are utilized in this paper to propose a synchronous voltage reversal (SVR) control model of TCSC. Then the paper adopts time domain simulation and frequency scanning method to analysis three different control methodologies, namely: SVR control, open-loop control, closed-loop control (including constant impedance, constant current, constant power). Impacts of these three control methods on subsynchronous resonance (SSR) are compared and results are given in detail. The simulation results show that with the same compensation level as the fixed series compensation, TCSC with closed-loop control can observably reduce the resonance amplitude to weaken SSR, where the use of SVR on TCSC can avoid the high-intensity non-linear between firing angle and capacitor voltage, thus make the control methodology implement easily. At low boost factor, SVR controlled TCSC can provide much better damping than conventional control scheme that controls the firing angle directly.