无线电能传输磁耦合系统Litz线圈交流电阻精确评估方法  

Accurate Evaluation Method of Litz Coil AC Resistance in Wireless Power Transfer Magnetically-Coupled System

作　　者：陈庆彬[1] 范峰 汪金帅 陈为[1] 邓小龙 Chen Qingbin;Fan Feng;Wang Jinshuai;Chen Wei;Deng Xiaolong(College of Electrical Engineering and Automation Fuzhou University,Fuzhou 350108 China;Fuzhou Changle District Electric Power Supply Branch,Fuzhou 350200 China)

机构地区：[1]福州大学电气工程与自动化学院,福州350108 [2]国网福州市长乐区供电公司,福州350200

出　　处：《电工技术学报》2022年第24期6294-6305,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51407032);福建省自然科学基金(2019J01251)资助项目。

摘　　要：无线电能传输(WPT)磁耦合系统的绕组损耗是影响WPT系统效率的重要组成部分,但目前绕组损耗(尤其是Litz线的绕组损耗)缺乏有效的评估方法。该文提出一种绕组交流电阻评估新方法,该方法通过小信号测量仪器测量得到WPT磁耦合系统的电参数,同时通过磁心损耗计算(或有限元仿真)的方式提取测量激励信号下磁心附加损耗电阻,实现绕组交流电阻和磁心附加损耗电阻的分离。该方法不仅适用于WPT磁耦合系统,同时也适用于气隙电感绕组交流电阻的评估。基于三维气隙电感的绕组交流电阻有限元仿真结果与该文方法的评估结果误差小于5%,验证了该文方法的有效性和可行性。最后,搭建一台2kW的WPT系统样机,通过差值功率验证了所评估的Litz线圈交流电阻的正确性。The winding loss of the wireless power transfer(WPT)magnetically-coupled system is an important part that affects the efficiency of the WPT system.However,there needs to be an effective evaluation method for winding loss(especially the winding loss of the Litz wire).This paper proposed a new method for evaluating the winding AC resistance.In this method,the electrical parameters of the WPT magnetically-coupled system were measured by a small signal instrument.The separation of the winding AC resistance and the additional core loss resistance under the measurement excitation signal was realized by core loss model calculation or finite element analysis(FEA)simulation.This method was suitable for evaluating the winding AC resistance of the WPT magnetically-coupled system and the air-gap inductor.The error between the FEA simulation results based on the 3-D air-gap inductor and the evaluation results of this method was less than 5%,which verified the proposed method.Finally,a 2kW WPT system prototype was built,and the correctness of Litz coil AC resistance extraction was verified by differential power.

关 键 词：无线电能传输 Litz线圈 绕组交流电阻 磁心附加损耗电阻 小信号测量 

分 类 号：TM724[电气工程—电力系统及自动化]