Research on the Smooth Switching Strategy of Switched Reluctance Starter/ Generator for More Electric Aircraft

Abstract

In order to prevent the overcurrent phenomenon of the phase windings of the switched reluctance machines (SRMs) during mode switching from starting to generating, the proposed smooth mode switching strategy reduces the peak phase current during the mode switching process by optimizing the excitation angle of the SRM control during this period. Firstly, the system dynamic simulation is performed to find the appropriate excitation angle during the mode switching process for each initial phase current at different motor speeds, thus the excitation angle-current off-line data tables can be built. Then, the initial phase current of the mode switching phase is detected at the switching moment, and the most suitable excitation angle for this initial phase current is found with LUT to control the peak phase current during the mode switching process and complete the smooth switching of SRM starting/generating mode. Finally, a simulation model of the smooth switching of the SRM starting/generating mode is built, and the simulation results prove the feasibility of the proposed smooth switching strategy in this paper.