Review and comparative study of control techniques for three-phase PWM rectifiers

Control techniques for PWM rectifiers in ac adjustable speed drives are presented. In particular, the so-called virtual flux-oriented control (VFOC) and virtual flux-based direct power control (VF-DPC) schemes are described and compared with their voltage-based counterparts, that is, the voltage-oriented control (VOC) and voltage-based direct power control (V-DPC) techniques. Theoretical background is provided, and results of computer simulations and laboratory experiments are given, documenting advantages and disadvantages of the individual control strategies.