A novel DC/3AC-converter topology with reduced component effort

Abstract

A novel topology is proposed that interfaces between one or multiple DC sources and a three-phase machine. The DCside converter consists of two half-bridges that form a specialized converter. The half-bridges operate at a reduced voltage which reduces inductor effort and switching losses. The resulting four DC-link levels power two three-phase bridges that can drive open-winding machines. The circuit is analyzed and compared to the common three-phase-bridge with DC converter by means of component stress and thus component effort. Finally, closed loop control is examined, synthesized and confirmed by simulation results.