含金属异物的无线充电系统场域等效建模分析  

Field equivalent modeling analysis of wireless charging system with metal foreign objects

作　　者：苏文博 王维 吕晓飞 窦真兰 王劼忞 SU Wenbo;WANG Wei;LYU Xiaofei;DOU Zhenlan;WANG Jiemin(School of Electrical and Automation Engineering,Nanjing Normal University,Nanjing 210023,China;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;State Grid Shanghai Electric Power Company,Shanghai 200122,China)

机构地区：[1]南京师范大学电气与自动化工程学院,江苏南京210023 [2]南瑞集团(国网电力科学研究院)有限公司,江苏南京211106 [3]国网上海市电力公司,上海200122

出　　处：《电力工程技术》2023年第3期226-232,249,共8页Electric Power Engineering Technology

基　　金：国家电网有限公司总部科技项目“基于混合储能的电动船舶岸电与互动技术研究”(52094021N00R)。

摘　　要：无线充电系统中,电能传输遵循发射线圈和接收线圈之间的磁耦合关系。当发射线圈和接收线圈之间存在金属异物时,异物的涡流或聚磁效应将会影响无线充电系统的传输性能与运行稳定性,严重时还会危害充电安全。为了厘清不同材质金属异物对无线充电系统性能的影响机理,有效分析异物的影响规律,迫切需要一种精确的金属异物建模方法,提高金属异物的检测精度。为此,文中计及金属的材质、位置、等效面积等关键因素,提出一种金属异物场域等效建模方法,通过构造金属异物影响下的无线充电系统耦合方程,对比得到异物引入前后发射线圈电流和接收线圈电流间的相位差表达式。在此基础上,进一步提出了铁磁性金属与非铁磁性金属的等效线圈模型及其参数配置方法,可精确得到金属异物介入条件下的电流相位差值。最终通过仿真与实验验证了建模方法的准确性与有效性,为无线充电系统中引入金属异物的特性分析与在线检测提供了一种新思路。In the wireless charging system,the power transmission follows the magnetic coupling relationship between the transmitting coil and receiving coil.When there are metal foreign objects between the transmitting coil and receiving coil,the eddy current effect or magnetic focusing effect of the foreign objects will affect the transmission performance and operational stability of the wireless charging system,and in severe cases,it can also endanger charging safety.In order to clarify the influence mechanism of metal foreign objects with different materials on the performance of wireless charging system and effectively analyze the influence law of foreign objects,an accurate modeling method of metal foreignobjects is urgently needed to improve the detection accuracy of metal foreign objects.Therefore,an equivalent modeling method of metal foreign objects field is proposed,taking into account the key factors of metal material,location,equivalent area and so on.By constructing the coupling equation of wireless charging system under the influence of metal foreign objects,the expression of phase difference between the transmitting coil current and receiving coil current before and after the introduction of foreign objects is obtained.On this basis,the equivalent coil model of ferromagnetic metal and non-ferromagnetic metal and its parameter configuration method are further proposed,which can accurately obtain the current phase difference under the condition of metal foreign objects intervention.Finally,the accuracy and effectiveness of the modeling method are verified by simulation and experiment.This method provides a new idea for the characteristic analysis and online detection of metal foreign objects introduced in wireless charging system.

关 键 词：无线充电 异物检测 金属异物 数值计算 场域建模 相位分析 

分 类 号：TM724[电气工程—电力系统及自动化]