An investigation of high efficiency operation conditions for a three-port energy source system using an indirect matrix converter

This paper describes an investigation of high efficiency operation conditions among three energy sources, which consists of two AC and one DC power supplies. The interface converter, which is the indirect matrix converter (IMC) is connected with a boost DC-DC converter at the DC link part of the IMC with an active snubber. In addition, the proposed converter can achieve a wide control range of output voltage by controlling the active snubber circuit. The efficiency of the interface converter depends on the power sharing ratio of each energy source. In order to determine the losses of the proposed circuit, a loss analysis method is established in the IMC. As a result, the high efficiency operation conditions and the validity of the proposed circuit are confirmed by the loss analysis. Furthermore, the experimental results confirmed that the input power factor is over 99% and the maximum efficiency is 95.4%. Finally, the switching device optimization is analyzed by the pareto frontier method to determine the cost and efficiency for IMC.