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Commutation Method for a Three-Phase Current-Sourced High-Frequency AC-link Inverter

This paper presents the results of recent work on developing a three-phase current-sourced high-frequency (HF) ac-link inverter. Two significant contributions are presented: first, the basic operation principles of the topology are analyzed, and second, a new commutation method for a three-phase current-sourced HF link is introduced. The HF ac-link inverter includes neither a large size line frequency transformer nor dc-link capacitors, so the size of the inverter can be reduced, and the reliability of the inverter can be improved. However, modulation methods for a voltage-sourced HF ac-link inverter are not suitable for a three-phase current-sourced HF ac-link inverter. Therefore, based on the analysis of the operations of a three-phase current-sourced HF ac-link inverter and the specific requirements for current commutations, this paper develops a new commutation method for a three-phase current-sourced HF ac-link inverter. MATLAB/Simulink simulations verify the new commutation method.