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Energies 2016, 9(10), 811; doi:10.3390/en9100811

Power Stabilization Strategy of Random Access Loads in Electric Vehicles Wireless Charging System at Traffic Lights

1
Department of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China
2
Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Zhenjiang 212009, China
3
State Grid Wuxi Power Supply Company, No. 12 Liangxi Road, Wuxi 214000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Gerard Pecht
Received: 24 August 2016 / Revised: 29 September 2016 / Accepted: 9 October 2016 / Published: 11 October 2016
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Abstract

An opportunity wireless charging system for electric vehicles when they stop and wait at traffic lights is proposed in this paper. In order to solve the serious power fluctuation caused by random access loads, this study presents a power stabilization strategy based on counting the number of electric vehicles in a designated area, including counting method, power source voltage adjustment strategy and choice of counting points. Firstly, the circuit model of a wireless power system with multi-loads is built and the equation of each load is obtained. Secondly, after the counting method of electric vehicles is stated, the voltage adjustment strategy, based on the number of electric vehicles when the system is at a steady state, is set out. Then, the counting points are chosen according to power curves when the voltage adjustment strategy is adopted. Finally, an experimental prototype is implemented to verify the power stabilization strategy. The experimental results show that, with the application of this strategy, the charging power is stabilized with the fluctuation of no more than 5% when loads access randomly. View Full-Text
Keywords: opportunity wireless charging system; electric vehicles; power stabilization strategy opportunity wireless charging system; electric vehicles; power stabilization strategy
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MDPI and ACS Style

Tan, L.; Liu, H.; Liu, Z.; Guo, J.; Yan, C.; Wang, W.; Huang, X. Power Stabilization Strategy of Random Access Loads in Electric Vehicles Wireless Charging System at Traffic Lights. Energies 2016, 9, 811.

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