A Bidirectional Inductive Power Interface for Electric Vehicles in V2G Systems

Abstract

Demand for supplying contactless or wireless power for various applications, ranging from low-power biomedical implants to high-power battery charging systems, is on the rise. Inductive power transfer (IPT) is a well recognized technique through which power can be transferred from one system to another with no physical contacts. This paper presents a novel bidirectional IPT system, which is particularly suitable for applications such as plug-in electric vehicles (EVs) and vehicle-to-grid (V2G) systems, where two-way power transfer is advantageous. The proposed IPT system facilitates simultaneous and controlled charging or discharging of multiple EVs through loose magnetic coupling and without any physical connections. A mathematical model is presented to show that both the amount and direction of power flow between EVs or multiple systems can be controlled through either phase or/and magnitude modulation of voltages generated by converters of each system. The validity of the concept is verified by theoretical analysis, simulations, and experimental results of a 1.5-kW prototype bidirectional IPT system with a 4-cm air gap. Results indicate that the proposed system is an ideal power interface for efficient and contactless integration of multiple hybrid or EVs into typical power networks.

Analysis and Design of a Wireless Power Transfer System with Dual Active Bridges

“…According to (19), the value of V 1 can be obtained by sampling DC voltage V in . Thus, the main task of additional reactance estimation is to detect θ.…”

“…More information of the implementation techniques will be elaborated in the following three parts. According to (19), the value of V1 can be obtained by sampling DC voltage Vin. Thus, the main task of additional reactance estimation is to detect θ.…”

Topology of a Bidirectional Converter for Energy Interaction between Electric Vehicles and the Grid

“…These topologies offer more flexibility and convenience in charging/discharging operations. Figure 6 depicts a two-stage contactless topology that is composed of a single-phase PWM converter, an inductive power transfer (IPT) high-frequency isolated DC-DC converter [66]. LCL parallel resonant circuits are used to achieve ZVS turning-on of the eight switches in the DC-DC part of this topology.…”

Research of Charging(Discharging) Orderly and Optimizing Load Curve for Electric Vehicles Based on Dynamic Electric Price and V2G

“…According to analysis, by 2020 the number of electric vehicle ownership in china will exceed 5 million [1]. Nowadays, many scholars are applying themselves to researching on the subject of large scale of electric vehicles connecting to the power grid [2][3][4][5].…”