A novel active clamping zero-voltage switching Grid-connected three-phase inverter

A novel active clamping zero voltage switching SVM controlled three-phase grid connected inverter is proposed in this paper. The inverter can realize zero voltage switching (ZVS) operation for all switching devices. In addition, the anti-parallel diode reverse recovery current of all switch devices is suppressed well. Space vector modulation can be realized with all the switching devices operating at the fixed switching frequency. And the switching voltage stress of all the power switch devices is equal to the DC link voltage, no additional voltage stresses is added on the power devices. The ZVS inverter can work both under Grid-connected condition and with independent loads. The soft switching condition of this inverter is analyzed. The operation principal and design guideline are described. A DSP controlled active clamping zero voltage switching three-phase inverter prototype is built to verify the theory.