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In the conventional inverter, the switching power losses cause the inverter efficiency to decrease at high switching frequencies. In this study, a new structure of a single-phase voltage-source inverter with low switching losses is proposed, for application in islanded AC grids. This converter is composed of two single-phase series inverters, with different switching frequencies. The main feature of the proposed converter is that, the total losses of the proposed converter are fewer than the total losses of a conventional single-phase inverter, at high switching frequencies. The proposed converter is designed by the appropriate power transistors in the market. By providing a suitable method for calculating the transistor power losses, the switching and conduction losses of the proposed converter are calculated, and compared with losses of a conventional singlephase inverter. The mathematical model of the proposed converter is derived and used along with root-locus and frequencyresponse analysis, for designing the controllers. The performance of the proposed converter has been assessed using the simulation studies in MATLAB/SIMULINK software environment.

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