基于直流侧输入电流检测的无线充电系统负载估计  

Load Estimation of Wireless Charging System Based on Measurement of DC-side Input Current

作　　者：李树凡 王丽芳[1,3] 郭彦杰[1,3] 廖承林[1,3] 吉莉[1,2] 

机构地区：[1]中国科学院电力电子与电气驱动重点实验室(中国科学院电工研究所),北京市100190 [2]中国科学院大学,北京市100190 [3]北京电动车辆协同创新中心,北京市100081

出　　处：《电力系统自动化》2017年第7期88-92,共5页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA016202);国家自然科学基金资助项目(51507168);北京市科技计划资助项目(D15110900290000)~~

摘　　要：基于无线充电系统逆变器等效负载与直流侧输入电流之间的关系,提出了一种利用直流侧输入电流进行负载估计的方法。首先,建立模型分析了直流侧输入电流与逆变器输出电流的关系,并推导得到输入电流与负载之间的数学关系,从而实现了基于直流侧输入电流的负载估计。进而,通过仿真和实验验证了该负载估计方法。实验结果显示,该方法在10~100Ω的负载范围内估计误差小于10%,达到了较高的估计精度。最后,利用所提出的负载估计方法对系统进行了故障分析,结果表明该负载估计方法能够实现对系统故障状态的有效识别。Based on the relationship between the inverter equivalent load and the DC-side input current of the wireless charging system,a load estimating method using DC-side input current is proposed.Firstly,a model is developed to analyze the relationship between the DC-side input current and the inverter output current.Then,the mathematical relationship between the input current and the load is derived.Thus the load estimating based on the DC-side input current is accomplished.Furthermore,simulations and experiments have been conducted to verify the proposed load estimation method.Experimental results show that the estimation error is less than 10% within the load range of 10~100 Ω.Finally,the proposed load estimating method has been used to conduct system fault analysis.The results show that the load estimating method is able to achieve effective identification of system fault states.

关 键 词：无线充电 负载估计 直流侧电流 故障分析 

分 类 号：TM724[电气工程—电力系统及自动化]