Control performance of single‐phase STATCOM and BTB by three‐level inverters

The so‐called three‐level inverters have been widely used for industry applications because of high‐voltage output ability and low harmonic contents. These applications are mainly suitable for AC motor drives. Recent attention has been paid to larger‐capacity inverters applicable to power system control. This paper describes their applications to power systems. First, harmonic analysis of a three‐level inverter is achieved under the condition that its two DC capacitor voltage are unbalanced. Second, a control method for balancing the two DC capacitor voltages is described. Finally, applications of single‐phase three‐level inverters to STATCOM and BTB are introduced. Their control performance is confirmed by computer simulation. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 157(1): 54–62, 2006; Published online in Wiley InterScience ( http://www.interscience.wiley.com ). DOI 10.1002/eej.20306