On high precision distributed series compensator control in static reference frame

High precision DSSC control in D-FACTS is discussed in the paper. A triple-loop control method is proposed with Proportion-Resonance AC output voltage controller aimed to gain high precision compensation voltage. In order to provide a clear control object to the DC voltage controller design, a DC voltage control idea is proposed, which transformed the DC voltage control to AC output voltage reference generation. With the proposed triple-loop control, high accuracy DSSC control is obtained and verified with both simulation and experiment. Compensation polarity switching is also investigated, the system can track such command and operate stably after short settling time.