Abstract：The three-coil wireless power transfer (WPT) system possesses a greater energy transmission distance and higher system transmission efficiency, compared to the two-coil WPT system. Although the three-coil WPT system has an excellent performance on long distance power transmission, theoretical analyses show that its near-field energy transfer efficiency is very low. In this paper, an efficiency optimization of three-coil WPT system based on frequency-varied control is proposed, which uses the optimal operating frequency corresponding to the distance at different transmission distances to improve its near-field energy transfer efficiency. Firstly, we deduced the three-coil WPT system efficiency equation to prove the efficiency could be changed by varying frequency. Secondly, we verified that there is an optimal operating frequency, which varies with transmission distances. Lastly, the feasibility of the efficiency optimization of three-coil structure WPT system based on frequency-varied control was verified by experiments. The problem of low efficiency in near-field is solved, and the maximum improvement of efficiency is 15%.
陈飞彬, 麦瑞坤, 李勇, 何正友. 基于调频控制的三线圈结构无线电能传输系统效率优化研究[J]. 电工技术学报, 2018, 33(zk2): 313-320.
Chen Feibin, Mai Ruikun, Li Yong, He Zhengyou. Efficiency Optimization of Three-Coil Structure Wireless Power Transfer System Based on Frequency-Varied Control. Transactions of China Electrotechnical Society, 2018, 33(zk2): 313-320.
[1] 陈阳琦, 陈丽华, 罗博, 等. 一种电场耦合式无线电能传输系统无源谐振元件电压优化方法[J]. 电工技术学报, 2018, 33(10): 2237-2244. Chen Yangqi, Chen Lihua, Luo Bo, et al.Voltage optimization method of passive resonant elements in electric field coupled power transmission system[J]. Transactions of China Electrotechnical Society, 2018, 33(10): 2237-2244. [2] 麦瑞坤, 徐丹露, 杨鸣凯, 等. 基于最小电流比值的IPT系统频率跟踪的动态调谐方法[J]. 电工技术学报, 2018, 33(6): 1276-1284. Mai Ruikun, Xu Danlu, Yang Mingkai, et al.Dynamic tuning method of frequency tracking based on the minimum current ratio for IPT system[J]. Transactions of China Electrotechnical Society, 2018, 33(6): 1276-1284. [3] 林天仁, 李勇, 麦瑞坤. 基于LCL-S拓扑的感应电能传输系统的建模与控制方法[J]. 电工技术学报, 2018, 33(1): 104-111. Lin Tianren, Li Yong, Mai Ruikun.Modeling and control method of inductive power transfer system based on LCL-S topology[J]. Transactions of China Electrotechnical Society, 2018, 33(1): 104-111. [4] 罗博, 陈丽华, 李勇, 等. 基于滑模控制的感应耦合电能传输系统输出电压控制研究[J]. 电工技术学报, 2017, 32(23): 235-242. Luo Bo, Chen Lihua, Li Yong, et al.Investigation of output voltage control for the inductive power transfer system based on sliding mode control theory[J]. Transactions of China Electrotechnical Society, 2017, 32(23): 235-242. [5] 黄智慧, 王林, 邹积岩. 双中继和三中继线圈位置参数对无线电能传输功率的影响[J]. 电工技术学报, 2017, 32(5): 208-214. Huang Zhihui, Wang Lin, Zou Jiyan.The influence of coil location parameters to load power in wireless power transmission with two or three relay coils[J]. Transactions of China Electrotechnical Society, 2017, 32(5): 208-214. [6] Ahn D, Hong S.A study on magnetic field repeater in wireless power transfer[J]. IEEE Transactions on Industrial Electronics, 2013, 60(1): 360-371. [7] Chi K L, Zhong W X, Hui S Y R. Effects of magnetic coupling of nonadjacent resonators on wireless power domino-resonator systems[J]. IEEE Transactions on Power Electronics, 2012, 27(4): 1905-1916. [8] Lower T E, Fragar L, Depcynzksi J, et al.General analysis on the use of Tesla’s resonators in domino forms for wireless power transfer[J]. IEEE Transa- ctions on Industrial Electronics, 2012, 60(1): 261-270. [9] Moon S C, Kim B C, Cho S Y, et al.Analysis and design of a wireless power transfer system with an intermediate coil for high efficiency[J]. IEEE Transactions on Industrial Electronics, 2014, 61(11): 5861-5870. [10] Zhang Jian, Yuan Xinmei, Wang Chuang.Com- parative analysis of two-coil and three-coil structures for wireless power transfer[J]. IEEE Transactions on Power Electronics, 2017, 32(1): 341-352. [11] Zhong W X, Zhang C, Liu Xun, et al.A methodology for making a three-coil wireless power transfer system more energy efficient than a two-coil counter- part for extended transfer distance[J]. IEEE Transa- ctions on Power Electronics, 2014, 30(2): 933-942. [12] 姜燕, 黄禹, 李中启, 等. 三线圈磁谐振式无线输电系统传输效率的优化[J]. 电力电子技术, 2014, 48(12): 75-77. Jiang Yan, Huang Yu, Li Zhongqi, et al.Optimization of efficiency of the three coil magnetic resonance based wireless power transfer system[J]. Power Electronics, 2014, 48(12): 75-77. [13] 罗斌, 刘婉, 钟晨明, 等. 磁耦合谐振三线圈无线电能传输的交叉耦合效应及电抗补偿[J]. 电力系统自动化, 2015, 39(8): 105-112. Luo Bin, Liu Wan, Zhong Chenming, et al.Cross coupling effect and reactance compensation method for three-coil magnetic coupling resonant wireless power transmission system[J]. Automation of Electric Power Systems, 2015, 39(8): 105-112. [14] Li Yong, Mai Ruikun, Lu Liwen, et al.Active and reactive currents decomposition-based control of angle and magnitude of current for a parallel multiinverter IPT system[J]. IEEE Transactions on Power Electronics, 2016, 32(2): 1602-1614. [15] Wang Wei, Huang Xueliang, Guo Jinpeng, et al.Power stabilization based on efficiency optimization for WPT systems with single relay by frequency configuration and distribution design of receivers[J]. IEEE Transactions on Power Electronics, 2017, 32(9): 7011-7024.
2018, Vol. 33 
