Abstract
The aim of this study is to predict the electromagnetic interference (EMI) effect produced by a dynamic wireless power transfer (DWPT) system on a buried multiconductor signal cable. The short-track DWPT system architecture is here considered with an operating frequency of 85 kHz and maximum power transferred to an EV equal to 10 kW. The EMI source is the DWPT transmitting coil which is activated when a vehicle passes over it. The electric and magnetic fields in the earth produced by the DWPT coil currents are calculated numerically using the finite elements method (FEM). These fields are then used to derive the voltage and current sources that appear in the field-excited multiconductor transmission line (MTL) model, used for the buried shielded cable. The MTL is analyzed considering the first ten harmonics of the current. The currents and voltages at the terminal ends are calculated considering the wireless charging of a single electric vehicle (EV) first, and then the simultaneous charging of 10 EVs which absorb a total power of 100 kW. The preliminary results reveal possible EMI problems in underground cables.
Highlights
The development of dynamic wireless charging for electric vehicles (EVs) is a key aspect for the future of autonomous transportation systems
We present a method based on the multiconductor transmission line (MTL) theory to evaluate the induced currents and voltages produced by a dynamic wireless power transfer (DWPT) system in an underground signal cable such as those used for traffic lights
A DWPT system is considered assuming the operational frequency equal to 85 kHz and the maximum power transferred to an EV equal to 10 kW
Summary
The development of dynamic wireless charging for electric vehicles (EVs) is a key aspect for the future of autonomous transportation systems. The EVs are recharged when the vehicle is stationary, e.g., parked in a garage at home or in a charging station located along the road, and the electricity is transferred from the electric grid to EVs mainly using a plug-in connection. The main limitation of EVs is the limited energy that can be stored in the battery This results in a limited range for EVs compared to traditional petrol-fueled vehicles. Another disadvantage is the long time required to significantly recharge the battery when connected to a charging station (either wired or wireless). A stationary wireless power transfer (WPT) system is a viable alternative to the current plug-in solution, offers the advantage of increased safety and allows you to fully automate the charging process without the need for any human interaction. Even the stationary WPT does not solve the problems of autonomy and charging time
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