Transient performance improvement of static series compensator by double vector control

This paper presents the principle and verification of the double vector control (DVC) algorithm, which improves the transient performance of the static series compensator (SSC). Both current and voltage controllers are incorporated by the DVC, with an inner current control loop and outer voltage control loop. The loop gains are determined according to the system stability analysis, carried out on the closed loop system. Also a review of the reported control techniques that have been implemented to control the injected voltage by the SSC is presented. A 10 kV SSC experimental setup is exploited to carry out experiments with different load types: static linear; dynamic linear and nonlinear loads. Experiments have proved that the proposed algorithm is able to improve the transient response of the SSC compared to like using phasors of the sequence components, RMS calculations and even vector controlled SSC without an inner current loop.