Control Parameter Analysis for an SRM Inverter for Range Extender Units with Integrated DC–DC Converter

Abstract

In modern electrical traction drives, a variable dc-link voltage can be applied to increase efficiency in partial load. A dc-dc converter can supply a variable dc-link voltage and transfer energy between the battery and the dc-link. Hybrid cars combine the advantages of long driving ranges with the partial zero-emission operation. In series-hybrid drive trains, a switched reluctance machine can be used as a generator for the range extender unit. This paper presents at first the mechanism of energy transfer between the battery and the dc-link. Further, a control parameter analysis of an inverter topology for a switched reluctance machine, which combines the dc-dc converter for the power transfer between the battery and the dc-link with the inverter for the generator, is investigated. For this analysis, the control parameters turn-on, freewheeling and turn-off angle are varied to test the controllability of the energy transfer between these two components. The simulation results of the presented analysis are finally validated with measurements on the test bench.