Abstract
STATCOMs have attracted attention as var compensators on electric power distribution systems. In this study, a star-connected modular multilevel converter (MMC) was applied to STATCOM. The voltage across the strings of the star-connected MMC was 1/√3 times that of a delta-connected MMC. MMCs can be interconnected without a transformer because they have high equivalent carrier frequency through phase-shifted pulse-width modulation. The dc capacitor voltage control of a star-connected MMC is relatively complex compared with delta connected MMCs, which have a circulation current as a control parameter. Relevant literature suggests that conventional dc capacitor voltage controls of MMCs for STATCOMs might be difficult to operate when the output reactive power is zero var. This paper presents a new dc capacitor voltage control method using symmetrical components. The overall control block mainly consists of two parts: average dc and dc capacitor voltage controls. The proposed dc capacitor voltage control and reactive power control were verified through experiments.
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