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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on mdpi.com as a courtesy and upon agreement with AVERE.
Open AccessArticle

Dynamic Wireless Power Transfer System for Electric Vehicle to Simplify Ground Facilities - Power Control Based on Vehicle-side Information -

The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba, Japan
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World Electr. Veh. J. 2015, 7(4), 558-569; https://doi.org/10.3390/wevj7040558
Published: 28 December 2015
PDF [664 KB, uploaded 18 May 2018]

Abstract

Electric vehicles (EVs) have environmental advantages and the capacity for advanced motion control. However, EVs need to be charged frequently due to their limited mileage per charge. A dynamic wireless power transfer (WPT) system for EVs can extend their cruising distance and reduce the size of their energy storage system. However, when being applied to rugged roadways over long distances, it is important to simplify ground facilities as much as possible. While it is practical for a static system to control both side using communication, a dynamic system for EVs should be controlled only on the vehicle-side. To implement a suitable control system, this paper focuses on vehicle-side control for achieving a required power and proposes a control method based on road-side voltage estimation using only vehicle-side information. Conventional methods have proposed voltage control using a DC-DC converter on the vehicle-side while road-side voltage is regulated to obtain a reference value. However, this causes ground facilities to become complicated due to a need for a feedback system. The proposed method estimates road-side voltage, therefore eliminating the need for its regulation. As a result, ground facilities can be simplified. The estimation equation is based on the equivalent circuit of a WPT system and expressed as a function of vehicle-side voltage and current. The reference value and the equilibrium point of the DC-DC converter can be obtained by the estimated road-side voltage. Therefore, the power control system with a voltage controller can be designed. The estimation equation and the power control are verified by experiments. These results suggest that the proposed method can achieve the required power without controlling the road-side or communicating between a vehicle and ground facilities.
Keywords: Wireless power transfer; Magnetic resonant coupling; Dynamic charging system; Primary voltage estimation; Power control Wireless power transfer; Magnetic resonant coupling; Dynamic charging system; Primary voltage estimation; Power control
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hata, K.; Imura, T.; Hori, Y. Dynamic Wireless Power Transfer System for Electric Vehicle to Simplify Ground Facilities - Power Control Based on Vehicle-side Information -. World Electr. Veh. J. 2015, 7, 558-569.

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