Capacitor voltage balancing in multi-level voltage reinjection (MLVR) converters

In common with conventional multi-level conversion configurations, the multi-level voltage reinjection scheme uses multi-level clamping and dc series connected capacitors. The operation conditions that lead to capacitor voltage unbalance are analyzed and the use of adaptive adjustment of the clamping switches conducting periods is investigated. It is shown that in the MLVR configuration the capacitor voltage balancing problem can be eliminated without the need for extra balancing components.