A Three Phases Z-Source Inverter Topology

Now Z-Source inverter is replacing traditional inverter and becoming a research focus. But traditional Z-source inverters bring high voltage stress both in DC input and the Z-source network, which restricts its wide application. In order to solve this problem, a new type Z-source structure with third harmonic injection control strategy is proposed in this paper. The principle and operation models are analyzed. Compared with traditional boost-type Z-Source topologies, the proposed topology offers lower voltage stress, what's more, soft-start strategy can be implemented to suppress the inrush surge arising in the start process. Finally, simulation results demonstrate the good performance of the proposed inverter.