Minimum-loss strategy for three-phase PWM rectifier

In this paper, the conduction and switching losses of a voltage-fed three-phase pulsewidth modulation (PWM) rectifier are analyzed for various PWM schemes. 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 ratio and 2) the absence of switching in the vicinity of peak input current, As a result, it is anticipated that switching loss of the rectifier is reduced by 46%, compared with continuous space-vector PWM rectifiers, and 20% compared with conventional discontinuous space-vector PWM rectifiers, Moreover, the proposed PWR I scheme can produce the highest available output voltage because it is based on the concept of voltage space vector. The effectiveness of the proposed PWM strategy is verified by experiments.