An integrated multi-port power converter with small capacitance requirement for switched reluctance machine

This paper presents an integrated multi-port converter(IMPC) for Switched Reluctance Machine (SRM). The conventional drive for SRM is based on asymmetrical H-bridge which needs a large capacitor on the dc bus to absorb the transient energy caused by turn-off process. The proposed topology is a multi-port converter which employs the capacitor as an extra port to the dc bus and is integrated based on switch multiplexing. With such converter, the capacitance can be reduced significantly by increasing the capacitor voltage ripple. In addition, the current commutation process can be accelerated with high voltage of capacitor based on such topology. The requirement of capacitance in asymmetrical H-bridge and the proposed topology is analyzed in detail and the corresponding control method for the proposed converter is introduced briefly as well. Simulation results in Matlab/Simulink verified the feasibility of the proposed topology and its superior performance compared with asymmetrical H-bridge structure.