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A dual-mode AC-DC converter

AC-DC-AC frequency conversion is widely utilized in power supply system fed by wind turbine, gas or diesel engine or other suitable drive that typically has a variable frequency power output. The paper introduces a new concept of AC-DC conversion system to address the machine interface at multi-MW level. The proposed topology consists a full-power diode bridge and a reduced power active converter to obtain a design with higher efficiency and lower cost compared to the conventional back-to-back converter. The topology and method of the operation are presented. Performance estimation and simulation results with a special designed synchronous generator are also provided.