Minimum-loss strategy for three-phase PWM rectifier

In this paper, the conduction and switching losses of a voltage-fed three-p hase pulsewidth modulation (PWM) rectifier are analyzed for various PWM sch emes. On the basis of this result, a novel PWM strategy which minimizes the loss of a three-phase PWM rectifier is developed. This minimization result is derived from the following two factors: 1) less switching frequency rat io and 2) the absence of switching in the vicinity of peak input current, A s a result, it is anticipated that switching loss of the rectifier is reduc ed by 46%, compared with continuous space-vector PWM rectifiers, and 20% co mpared with conventional discontinuous space-vector PWM rectifiers, Moreove r, the proposed PWR I scheme can produce the highest available output volta ge because it is based on the concept of voltage space vector. The effectiv eness of the proposed PWM strategy is verified by experiments.