A FULLY SOFTWARE-CONTROLLED PWM RECTIFIER WITH CURRENT LINK

A fully software-controlled pulse-width modulated (PWM) rectifier with current link is presented. The PWM rectifier uses six switches to con nect the three-phase source to the load directly. Line power factor is controlled while maintaining dc current. The input filter of the PWM rectifier is analyzed and its analysis shows that unity power factor i s achieved by lagging of the input current of the PWM rectifier with r espect to the source voltage. The PWM technique is developed using a s pace vector modulation and its implementation is carried out with a mi nimal control hardware structure based on a 16-b single-chip microcomp uter. It is shown via experimental results that the proposed scheme gi ves good performance for the PWM rectifier with current link.