Research on the Anti-Offset Characteristics of WPT System Based on New Heterogeneous Coils and Multi-Objective Optimization
Cheng Jiangzhou1,2, Cheng Xinru1, Liu Songkai1,2, Xiao Lisha1, Wang Yixin1
1. School of Electrical Engineering and New Energy China Three Gorges University Yichang 443002 China; 2. Hubei Provincial Engineering Technology Research Center for Microgrid Yichang 443002 China
Abstract：When the UAV lands on the wireless charging platform, the coupling mechanism may shift due to external environmental factors or insufficient landing accuracy. This offset will weaken the coupling strength of the system, resulting in unstable charging process and poor transmission performance. In view of the above problems, the existing research mainly proposes improvements from the aspects of coupling mechanism design, compensation topology optimization, and control strategy improvement, but there are usually problems such as limited adaptability, poor performance for specific offset types (especially angle offset), and lack of systematic solutions. In order to improve the anti-offset ability of the wireless power transmission system under the premise of avoiding complex control, it is necessary to study the high anti-offset coupling mechanism and optimize the parameters. Firstly, a triangular hexagon coil is designed by using hexagon coil as the research object. Combined with the characteristics of strong external magnetic induction intensity and weak center of the tightly wound coil and the characteristics of weak external magnetic induction intensity and strong center of the loosely wound coil, the spatial distribution of magnetic flux density of the tightly wound coil, the loosely wound coil, the double-coil combined wound coil and the ‘loose-tight-loose' wound coil is compared and analyzed. A ‘loose-tight-loose'(LTL) triangular hexagonal heterogeneous coil (LTL-HexTri) is proposed. This structure helps to expand the range of flux decoupling and slow down the decrease of coupling coefficient caused by coil offset, thus significantly enhancing the anti-offset performance of the system. On this basis, the mutual inductance and self inductance parameters are analyzed, and the equivalent circuit model is established. Secondly, in view of the problems of poor initial solution quality and slow convergence speed of non-dominated sorting genetic algorithm in optimizing the parameters of magnetically coupled wireless power transmission coils, the algorithm is improved according to the characteristics of the model. By introducing the genetic circuit search strategy to ensure that the solution set satisfies the complex physical constraints, and integrating the adaptive idea to dynamically adjust the genetic parameters, the optimization efficiency and the quality of the Pareto front are significantly improved. The simulation and experimental results show that: (1) When the transmission distance varies from 1 cm to 5 cm, the proposed coupling mechanism forms a more concentrated and efficient charging region in the central region, and the output power transmission range is about 300 W. (2) The offset along the x-axis and y-axis is scanned and measured. The comprehensive performance of the compact-loose combined winding is between that of the LTL and the single winding method. The mutual inductance value of the LTL winding is higher than that of the other three methods as a whole, and it has stronger anti-offset performance. The coupling mechanism can maintain an output power of 300 W with a longitudinal offset range of ±60 mm and a lateral offset range of ±40 mm, and the transmission efficiency is always higher than 80%. When the offset angle changes, the output power of the system is always not less than 350 W, and the transmission efficiency is always not less than 85%. (3)The optimization method based on adaptive genetic loop non-dominated sorting genetic algorithm ( AGA-GC-NSGA-Ⅱ ) effectively improves the output power and transmission efficiency of the wireless power transmission system. The optimized system can maintain efficient power transmission performance under different offset conditions.
程江洲, 程芯如, 刘颂凯, 肖丽莎, 王奕昕. 基于新型异构线圈与多目标优化的无线电能传输系统抗偏移特性研究[J]. 电工技术学报, 2026, 41(17): 5740-5754.
Cheng Jiangzhou, Cheng Xinru, Liu Songkai, Xiao Lisha, Wang Yixin. Research on the Anti-Offset Characteristics of WPT System Based on New Heterogeneous Coils and Multi-Objective Optimization. Transactions of China Electrotechnical Society, 2026, 41(17): 5740-5754.
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2026, Vol. 41 
