Capacitor clamped multi-level matrix converter: Space vector modulation and capacitor balance

The matrix converter is an array of controlled bi-directional semi-conductor switches that allows direct AC-AC conversion without an intermediate DC link. This converter has several attractive features that have been investigated in the last two decades. Multi level converter technology has become increasingly popular in recent years due to high power quality, high-voltage capability, low switching losses, and low EMI issues. This paper is concerned with applying multi-level techniques to direct AC-AC power converters. The paper concentrates on developing the concepts of space vector modulation for a multi level matrix converter. Results from a small-scale experimental prototype are presented to validate the theoretical findings.