Dynamic EV Charging WPT System Control Based on Modulated Variable Laplace Transform

The paper deals with the control of an LCL-compensated WPT system (WPTS) for the dynamic charging of electric vehicles (EVs). As it is well-known, the high working frequency of the WPTSs prevents their instantaneous control because of the fast processing that would be required for the controlled quantities, well beyond the capabilities of the modern microcomputers. Therefore, the control of the WPTSs is carried out by acting on the envelopes of the controlled quantities on account of the fact that they have a sinusoidal waveform. In this paper, the controlled quantities selected for the considered WPTS are the transmitting coil current and the DC-bus voltage at the receiving stage, and the input quantity is the supply inverter voltage. The transfer functions (TFs) between their envelopes are at first computed by means of the Modulated Variable Laplace Transform method. Then, the controllers of the WPTS control system are designed by help of the computed TFs. At last, the performance of the arranged control system is tested by simulation.