Feed-forward control of STATCOM with harmonic voltage in power grid

YANG Cheng-shang， CHEN Hui-ming， WANG Zheng-shi
（College of Electrical Engineering， Zhejiang University， Hangzhou 310027，China）

Abstract：Aiming at the harmonic voltage in power grid influencing on the performance of static synchronous compensator（STATCOM），such as，the distortion of compensation current，the fluctuation of voltage across DC capacitor caused by energy alternation between STATCOM and grid，the shortcomings of the control based on PI close loop was analyzed，and bad capacity of resisting disturbance accompany with large error of current tracking was illustrated. Based on those problems，a novel feed-forward control method importing the voltage of PCC to STASCOM was proposed，restraining the impact of harmonic voltage in the power grid. The results indicate that the proposed control strategy enhances the feature of the STATCOM，making the out current be sine-wave，and reducing DC voltage' ripple. And the system has good steady-state and dynamic performance.
Key words： static synchronous compensator （STATCOM）；harmonic voltage；PI control；feed-forward control