Control of DC Microgrid for Electrical Vehicles(EV s) Wireless Charging

This paper introduces a demonstration of an islanded DC microgrid for electrical vehicles (EVs) wireless charging. The DC microgrid includes photovoltaic panels (PV), small wind turbine (WT), battery units (BUs) and a wireless charger. The planning, control strategy, laboratory system and the demonstration of the microgird are presented. Firstly, the system capacity, configuration and topology are designed and the voltage level is analyzed by using the energy balance and power balance method. Meanwhile, the electricity of the secondary system is planned and an uninterruptible power supply (UPS) is designed to supply them reliably. Secondly, the control methods of the DC microgrid composed of PV, WT, BU, UPS and wireless charger is investigated. The master-slave control strategy is used. The battery bidirectional DC/DC converter is responsible to stabilize DC bus voltage. The challenge is the fast response of the wireless charger as a power electronic loads in an islanded microgrid. Both PV and WT are controlled using maximum power point tracking (MPPT). Then wireless charger and electromagnetic shielding device is designed and the EV charging device is reformed. Lastly, the laboratory system and the demonstration results are shown. The system realizes the EVs wireless and fast charging with the renewable energy.