Improved Quasi-Z Source Inverter for Renewable Energy

To further improve the performance of inverter in renewable energy power generation system, an improved Quasi-Z source inverter topology with double inputs and redundancy is designed in this paper. Through the analysis of the working principle of the inverter and the embodiment form of the redundancy ability, the operation performance parameters such as the boost ability and the device stress are deduced. The proposed inverter inherits all the advantages of SL-QZSI, but also has higher boost ability. Meanwhile, the inverter has certain redundancy in structure, the dual-input structure can save the converter cost and ensure the inverter to continue to run after power failure. The correctness of the theoretical analysis and the feasibility of the inverter are verified by simulation and experiment.