Transformerless high voltage grid-connected inverter based on carrier phase-shifted control

As far as the problem of high voltage transformation in wind power concerned, a module of transformerless high voltage grid-connected converter based on carrier phased-shift control strategy is proposed. The working condition of cascaded power modules is elaborated, and the analysis of four operating states is introduced as well in this paper. Furthermore, with the technology of unipolar dual-frequency Carrier Phase shift PWM modulation (CPS-SPWM), the corresponding simulation and experiments for three units cascaded converter confirm the control method´s effects.