基于线圈偏移的无线电能传输系统参数优化方法

磁耦合谐振无线电能传输系统在实际设计过程中，系统线圈的相对位置是系统传输性能主要影响因素之一，针对传统电能传输系统中线圈发生偏移时造成的效率亏损问题进行研究，提出一种基于萤火虫算法的参数设计方法，实现线圈在非同轴放置时的效率优化；首先对不同位置下的线圈互感系数进行分析，然后引入双边LCC拓扑结构对其传输性能进行分析，根据分析结果采用萤火虫算法进行参数优化，最后通过有限元仿真及实验平台验证方法的有效性，结果显示在偏移距离小于线圈半径时系统的传输效率可保持85%以上，与传统的SS拓扑结构下WPT系统进行比较，优化后的系统传输效率平均提升20%，负载的接收功率保持在20 W左右。

Coil Offset Based Wireless Power Transfer System Parameter Optimization

In a magnetic coupling resonant wireless power transmission system, the relative position of the system coil is one of the main factors affecting its transmission performance. This article focuses on the efficiency loss caused by the offset of the coil in the traditional power transmission system, and proposes a Firefly algorithm based parameter design method to optimize the efficiency of the coil when placed non-coaxially. Firstly, the analysis of the mutual inductance of the coil at different positions is carried out, and then the bilateral LCC topology is applied to examine its transmission performance. The parameters optimization is carried out using the firefly algorithm, and finally the effectiveness of the method is verified through a finite element simulation and experimental platform. The results show that when the offset distance is less than the radius of the coil, the transmission efficiency of the system can maintain more than 85%, which is similar to the traditional SS topology of WPT. In comparison, the transmission efficiency of the optimized system is increased by an average of 20%, and the received power of the load remains at about 20 W.