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A High Step-Up Dual-Source Three-Phase Inverter Topology With Decoupled and Reliable Control Algorithm

In this article, a new structure for dual-input single-output three-phase inverters with a high voltage gain is presented. The proposed structure is based on the impedance source inverters, in which two independent input sources can share their power to supply a common load by replacing the high-frequency transformers with some inductors. The proposed structure is also a voltage booster and is suitable for applications such as connecting to hybrid renewable energy systems. In the proposed structure, to improve the efficiency and to reduce the cost and structure weight, only one power conversion stage is used. In addition, the number of used semiconductors is lower than previous structures in the literature. As renewable energy sources such as wind and solar have the nature of intermittency, the supply of load in the systems which use them as inputs may be marred by some reliability problems. To this end, supplementary sources and also a fast control algorithm could be used to overcome the reliability problem. The proposed switching method controls the ratio of the power absorbed from the input sources and the dc-link voltage through the control of two independent variables. The reliability of the load supply is improved since the controller computes the parameters very fast. The experimental results on a 310-W prototype confirm the theoretical analysis and the performance of the proposed inverter.