基于PEEC的WPT系统磁芯结构建模  

Modeling of WPT System Magnetic Core Structure Based on PEEC

作　　者：许肖颖 夏能弘 张帆[2] 李方深 XU Xiao-ying;XIA Neng-hong;ZHANG Fan;LI Fang-shen(Shanghai University of Electric Power,Shanghai 200090,China;不详)

机构地区：[1]上海电力大学,电气工程学院,上海200090 [2]国网安徽省电力公司,安徽合肥230000

出　　处：《电力电子技术》2024年第3期78-80,117,共4页Power Electronics

基　　金：国家自然科学基金(51607110)。

摘　　要：磁耦合机构作为无线电能传输的核心部分,直接决定系统的传输性能。目前广泛采用加装磁芯来提高耦合机构的传输性能。然而加入磁芯后,线圈与磁芯的融合建模及协同设计问题,目前多依赖于电磁仿真软件及二维分区建模,该方法无法量化磁芯参数对系统传输性能的作用。此处基于部分元等效电路(PEEC)对磁芯进行建模,根据磁性材料特性分别从涡流、磁化强度两方面构建磁芯二元模型,并引入退磁因子对磁化强度模型进行修正。基于电场积分方程构建了以磁芯涡流、节点电压和磁化强度为未知量的解决矩阵,实现了线圈与磁芯融合建模。在融合建模的基础上,基于矢量磁位提取了带芯线圈的自感系数,将建模结果与商用仿真软件及实验进行对比,其误差控制在5%以内,验证了建模结果的准确性。带芯线圈自感参数量化了磁芯对线圈的附加耦合作用,为磁芯结构设计提供理论支撑。The magnetic coupling mechanism,as the core part of the wireless power transmission,directly determines the transmission performance of the system.The addition of a magnetic core is widely used to improve the transmission performance of the coupling mechanism.However,the fusion modeling and co-design of coils and cores after the addition of magnetic cores are currently relying on electromagnetic simulation software and two-dimensional partition modeling,which can not quantify the effect of core parameters on the transmission performance of the system.The core is modeled based on partial element equivalent circuit(PEEC),and the binary model of the core is constructed from two perspectives of eddy current and magnetization strength respectively according to the magnetic material properties,and the demagnetization factor is introduced to correct the magnetization strength model.Based on the electric field integral equation,the solution matrix is written with the core eddy current,nodal voltage and magnetisation strength as unknown quantities to realise the fusion modeling of the coil and the core.Based on the fusion modeling,the self-inductance coefficient of the coil with core is extracted based on the vector magnetic potential.The modeling results are compared with commercial simulation software and experiments,and their errors are controlled within 5%,which verifies the accuracy of the modeling results.The self-inductance parameters of the coil with core quantify the additional coupling effect of the core on the coil and provide theoretical support for magnetic core structure design.

关 键 词：无线电能传输 部分元等效电路 自感系数 

分 类 号：TM724[电气工程—电力系统及自动化]