A Design Methodology for EV-WPT Systems to Resonate at Arbitrary Given Bands

Yong Yin, Yuhua Xiao, Chengliang Wang, Qingsheng Yang, Yahui Jia and Zhijuan Liao
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Yong Yin: State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210024, China
Yuhua Xiao: State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210024, China
Chengliang Wang: Jiangsu Fangtian Electric Power Technology Co., Ltd., Nanjing 210024, China
Qingsheng Yang: Jiangsu Fangtian Electric Power Technology Co., Ltd., Nanjing 210024, China
Yahui Jia: School of Automation, Chongqing University, Chongqing 400044, China
Zhijuan Liao: School of Automation, Chongqing University, Chongqing 400044, China

Energies, 2021, vol. 15, issue 1, 1-17

Abstract: Due to the effects of splitting frequency and cross coupling, the resonant frequency of the WPT system usually deviates from the given frequency band, and the system operating at the given frequency band suffers a very low output power. Ensuring that electric vehicle wireless power transfer (EV-WPT) systems operate at a resonant state is the prerequisite for efficient energy transfer. For this purpose, a novel design method by manipulating the eigenstate parameters is proposed in this paper. The proposed system can make a EV-WPT system with arbitrary coil successfully to resonate at any given bands, not just a single band. Therefore, the method designed in this article cannot only eliminate the problem of low power caused by frequency deviation, but also realize the application requirements of multiple frequency bands. Firstly, this article establishes an accurate state space model of an n-coil fully coupled EV-WPT system, and after that, the analytical current response on each circuit is derived. Based on that, a detailed frequency spectrum analysis is presented, along with several essential spectrum parameters’ derivations, including center frequencies and bandwidths. Then, with the center frequency and bandwidth as the design indexes, a novel methodology of designing to make EV-WPT systems achieve resonant-state at arbitrary given bands is derived. Finally, simulation and experimental verification are carried out. Simulation and experimental results show that whether it is a single-band or multi-band system, the accuracy of the value under designed resonant frequency is less than 0.01, which can effectively eliminate the frequency deviation phenomenon and obtain the maximum power output at the given frequency band.

Keywords: EV-WPT; magnetic coupling; multi-band; system design; frequency splitting (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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