A Wireless Bidirectional Power Supply Topology Suitable for Vehicle-to-Grid Technology

Abstract

Vehicle-to-grid (V2G) technology facilitates bidirectional energy exchange between electric vehicle batteries and an electric power grid. This is an important component of smart grid technology, which not only can alleviate the problem of power grid fluctuations owing to the use of intermittent energy sources like wind and solar power, but also can benefit users of electric vehicles. In recent years, the development of wireless power transmission has provided a new route for electric vehicle charging and discharging. The absence of physical contact offers numerous advantages such as flexible mobility and safety, and is therefore more suitable for application to V2G technology. This paper proposes a bidirectional wireless energy transmission topology appropriate for V2G based on the characteristics of wireless energy transmission, and discusses the feasibility of applying wireless power transmission to V2G charging and discharging energy interactive systems. A power flow control strategy is also given according to the constant current source characteristics of this topology. Finally, the effectiveness of this topology and related control strategy is verified by simulation.