The power fluctuation problem has been a key issue in dynamic wireless power transfer (WPT) systems. In the past research studies, the power fluctuation problem at low-transmission distance has been solved, but existing solutions often involve complex control strategies and cannot realise power stabilisation for dynamic WPT systems under high-transmission distance. As a remedy, the spatial rotating coil design scheme is proposed based on magnetic field aggregation to solve the power fluctuation problem without control strategy for high distance dynamic WPT system. Firstly, the crucial parameters affecting power fluctuations are analysed. Then the relative optimisation backgrounds are introduced. Afterwards, the mechanism of power sag is analysed based on magnetic field analysis. Subsequently, the spatial rotating double D (DD) coil design is proposed inspired by omnidirectional WPT coil, and various different DD coil schemes are optimised utilising magnetic field aggregation method to acquire the optimal scheme. Compared with the original coil scheme, the proposed design scheme improves fluctuation of system mutual inductance without complicated control strategies according to simulation results. Finally, a physical coil system consistent with the simulation system is constructed, which verifies the improvement effect of the proposed scheme and effectively confirm feasibility of the optimal scheme.

中文翻译：

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基于磁场聚集的空间旋转线圈功率稳定方案设计

功率波动问题一直是动态无线电力传输（WPT）系统中的关键问题。在过去的研究中，已经解决了低传输距离下的功率波动问题，但是现有解决方案通常涉及复杂的控制策略，并且无法在高传输距离下实现动态WPT系统的功率稳定。作为一种补救措施，提出了一种基于磁场聚集的空间旋转线圈设计方案，以解决高距离动态WPT系统无控制策略的功率波动问题。首先，分析了影响功率波动的关键参数。然后介绍了相关的优化背景。然后，基于磁场分析来分析下陷的机理。后来，在全方位WPT线圈的启发下，提出了空间旋转双D（DD）线圈设计，并利用磁场聚集法对各种不同的DD线圈方案进行了优化，得到了最优方案。与原来的线圈方案相比，所提出的设计方案根据仿真结果，无需复杂的控制策略即可改善系统互感的波动。最后，构建了与仿真系统相符的物理线圈系统，验证了所提方案的改进效果，有效地确定了最优方案的可行性。根据仿真结果，该设计方案无需复杂的控制策略即可改善系统互感的波动。最后，构建了与仿真系统相符的物理线圈系统，验证了所提方案的改进效果，有效地确定了最优方案的可行性。根据仿真结果，该设计方案无需复杂的控制策略即可改善系统互感的波动。最后，构建了与仿真系统相符的物理线圈系统，验证了所提方案的改进效果，有效地确定了最优方案的可行性。