A 6.6-kV transformerless cascade PWM STATCOM. Experimental verification by a three-phase 200-V, 10-kVa laboratory system.

This paper deals with a 6.6-kV transformerless STATCOM cascading multiple single-phase H-bridge PWM converters in each phase. The AC voltage of the STATCOM is almost sinusoidal, so that it requires no harmonic filter. Each converter is equipped with a capacitor and a voltage sensor on the DC side, which are electrically isolated from each other. The STATCOM has the capability of self-starting and voltage-balancing without any external power supply or equipment. Experiments using a three-phase 200-V, 10-kVA laboratory system, along with computer simulations, are carried out to confirm the viability and effectiveness of the STATCOM. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 170(1): 55–64, 2010; Published online in Wiley InterScience (<URL>www.interscience.wiley. com</URL>). DOI 10.1002/eej.20822 [ABSTRACT FROM AUTHOR]