Analysis of methods for maintaining the power constant mode for a switched reluctance motor of a mine electric locomotive

Abstract

The article discusses the choice of control parameters to ensure a constant power in the Switched Reluctance Motor of a mine electric locomotive with a capacity of 13 kW and a rotation speed of 562 min-1. The analysis of articles published during 2000-2018 in Ukraine and abroad on Switched Reluctance Motor for various drives in transport, where this mode is mandatory. The analysis showed that there is a great diversity in the choice of control parameters among different authors, and also the majority of authors do not have an analysis of transients when using the selected control parameters. The author of the article in previous works used two control methods: phase regulation over the entire range of rotation speed changes with constant power and only phase regulation at the beginning of the range and phase plus switching the connection of phase coils from serial to parallel at a certain speed. Using the first method leads to a significant increase in the ripple of the moment with increasing speed, the use of the second method leads to a sharp increase in the inverter current. It is proposed to increase the supply voltage by switching the connection of the batteries. Transients in the mode of constant power are considered when the load moment changes from the nominal to the moment at the maximum speed equal to three nominal. For analysis, we used the author's engine model for transients in the Simulink program of the Matlab software package. The control parameters were determined using mechanical calculated on the engine model for steady-state conditions. The proposed method allowed to reduce the ripple of the moment and the maximum current of the inverter. The results of the analysis can be used when developing a program for the microprocessor of the controller.