THE CONTROL SYSTEM OF A WIRELESS CHARGING STATION FOR MINE ELECTRIC LOCOMOTIVE BATTERIES

The increase in safety and efficiency requirements in the mining industry drives the implementation of automated systems and the transition to unmanned technologies. This trend is also true for locomotive haulage with battery-powered mine electric locomotives. Wireless charging stations have already been developed for their charging and safety has been confirmed for use in gaseous-and-dusty mines. Wireless charging stations for mine electric locomotive batteries must be controllable. The article provides a brief classification of control approaches used in wireless power transfer, substantiates the choice of control on the transmitting side, and compares two closed loop control systems for load current: with frequency control and with pulse-width modulation control. It is proposed to use the equivalent circuit idealizing a high-frequency inverter and a rectifier at the output of the resonant circuit for the mathematical description of the wireless charging station, but for the processes study the dynamic model in MatLab Simulink detailed to the level of power semiconductor converters is used. Based on the modeling results, critical shortcomings of the considered options are noted and the control system is proposed combining frequency control and pulse-width modulation control.