Abstract

The analysis of a multi-cell topology implemented with single-phase non-regenerative cells under an unbalanced ac mains is presented. The study shows that the topology naturally compensates the voltage unbalances; for instance, for a 100% voltage unbalance in the ac mains, just a 32% reaches the load. Additionally, in order to compensate the remaining unbalance at the load side, a feed-forward control technique is used. The strategy reduces near to zero the load fundamental voltage unbalance while the input current unbalance and distortion are improved as well. Simulated results confirm the theoretical considerations. ©2005 IEEE.