One-Cycle Control Based Vienna Rectifiers with Input Power Factor Regulation

In this paper, a crucial technique for incorporating reactive power compensation functionality into Vienna rectifiers is discussed and a modified one-cycle-control (MOCC) scheme is proposed for regulating three-phase Vienna rectifiers operating under leading, lagging or unity power factor with sinusoidal input current. The operating principle of the conventional OCC (COCC) strategy is reviewed simply at first, then the MOCC scheme with input current phase-shift control is discussed in detail. To mitigate input current distortion caused by the current phase-shift, a method by injecting some components to the current command signals is further presented. The implementation of the proposed MOCC scheme is as simple as that of the COCC scheme. In addition, all other advantages exhibited by the COCC scheme, such as no phase-locked loop, no frame transformation and constant switching frequency are also retained by MOCC scheme. The theoretical analysis of the proposed MOCC schemes is fully verified by simulations. (paper)