Voltage balance control of non-regenerative three-level boost rectifier using carrier-based pulse width modulation

In this paper, a novel voltage balance control scheme with carrier-based implementation is proposed for the non-regenerative three-level boost (or Vienna type) rectifier. The dc-link voltage balance mechanism for the non-regenerative three-level boost rectifier is first studied from the space vector standpoint and then an optimal zero sequence component is found to guarantee zero neutral point current injection. Based on this analysis the voltage balance control is designed with the combination of a feed forward component and a feedback loop, which can be easily incorporated into the conventional multi-loop d-q controller and then implemented by carrier-based modulation. The impact of the optimal zero sequence on the feasible modulation index is also analyzed. The proposed approach features great simplicity and good dc link voltage balance regulation. Both simulations and experiments are carried out and the results verify the feasibility of this proposed control algorithm.