１．Introduction

　The new energy source DSG system such as solar energy generation will be common use in home and factory level because it is small scale and can be set up anywhere. Therefore, the power conversion system used them have been required strongly EMI noise reduction, down sizing and so on. Moreover, It is necessary to pay careful attention to influences for household electric appliances and information communication apparatus set up near them. So, we think that the high-frequency AC link power conversion system with soft-switching operation is the best matching for DSG system. At present, the hybrid system including the power storage system also has been implemented the study in order to operate the DSG system more effective. From this reason, the high-frequency AC link power conversion system acted as an interface of the system, load, and new energy sources are required an ability of the power flow between both side. So, we proposed the novel high-frequency AC link DC-AC converter, which is capable of realization mentioned above. In this paper, we will perform the study about the high-frequency AC link single-phase DC-AC converter applied for the household DSG system and the UPS. First, we will describe the high-frequency AC link single-phase DC-AC converter and the conventional control scheme, the symmetrical control scheme, and will point out that features and problems. And then, we will indicate the operating principle and simulating result of the high frequency AC link single-phase DC-AC converter with new control strategy for it, the secondary phase-shifted PWM control scheme. Moreover, we will perform the comparison and the study between proposed scheme and conventional scheme, and will present the features and effectiveness of proposed converter, the high-frequency AC link single-phase DC-AC converter employing the secondary phase-shifted PWM control scheme.

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