PEREC Configurations realizing bi-directional power flow through double-sided PWM converters AC U Source bo VI Source Load 本本本 平平 Voltage-source type Current-source type 7AC Load AC Source U V W a b c Source Load Power Electron cs i Configurations realizing bi Configurations realizing bi -directional power directional power flow through double flow through double -sided PWM converters sided PWM converters Voltage Voltage -source type source type Current Current-source type source type 7