Operating principles of shunt STATCOM based on 3-level diode-clamped converters

This paper offers a novel topology for the implementation of a shunt STATCO M based on a grouping of four 3-level, diode-clamped converters, switching at line frequency and coupled to the sc system through wye/wye and wye/delt a phase-shifting transformers. Advantages include direct voltage control th rough the gating pattern and reduced size of de capacitor. The dominant har monic on the sc side is the 11(th) and on the de side the 12(th). The propo sed STATCOM call meet typical harmonic distortion requirements.