无线电能传输系统接收端多参数联合辨识  

Joint Identification of Multiple Parameters in the Secondary Side of Wireless Power Transfer Systems

作　　者：郭彦杰 张玉旺[2] 王丽芳[2] 李勇[3] 刘伟龙 GUO Yanjie;ZHANG Yuwang;WANG Lifang;LI Yong;LIU Weilong(State Key Laboratory of Reliability and Intelligence of Electrical Equipment(Hebei University of Technology),Beichen District,Tianjin 300401,China;Key Laboratory of Power Electronics and Electric Drive(Institute of Electrical Engineering,Chinese Academy of Sciences),Haidian District,Beijing 100190,China;School of Mechanical Engineering,University of Science and Technology Beijing,Haidian District,Beijing 100083,China;Beijing Institute of Mechanical Equipment,Haidian District,Beijing 100854,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津市北辰区300401 [2]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),北京市海淀区100190 [3]北京科技大学机械工程学院,北京市海淀区100083 [4]北京机械设备研究所,北京市海淀区100854

出　　处：《中国电机工程学报》2022年第20期7403-7414,共12页Proceedings of the CSEE

基　　金：国家重点研发计划政府间国际科技创新合作重点专项(2019YFE0100200);广东省基础与应用基础区域联合基金项目(2020A1515111010)。

摘　　要：在无线电能传输(wireless power transfer,WPT)系统中引入参数辨识技术,能够在不使用无线通讯和传感器的情况下,获得WPT接收端负载等参数,从而有助于实现系统控制与状态监测。文中提出一种WPT接收端多参数联合辨识方法,在不需要预先知道线圈耦合状态的前提下,仅采用WPT发射端的一个测量电压,就能够实现电池电压、充电电流、整流桥等效输入阻抗及接收端电压电流等多个重要参数的联合辨识。首先,建立WPT等效电路模型,以发射端并联补偿电容上的电压为例,利用定义系数推导发射端测量电压与接收端阻抗之间的关系,得到不依赖于线圈互感的参数辨识表达式。然后,通过整流桥等效输入阻抗分段线性化并忽略接收端补偿电容杂散电阻,在保证精度的同时实现辨识算法的简化。进而,推导WPT测量变量与接收端待辨识参数之间的量化关系,并阐述具体辨识流程和步骤。最后,搭建WPT实验台架,实验结果表明:在变负载和不同线圈耦合情况下,电池电压、充电电流、整流桥等效输入电阻、等效输入电抗、接收端并联补偿电容电压和接收线圈电流的最大辨识误差分别为5.5%、5.2%、6.4%、6.5%、7.9%和6.9%,从而证明了提出的方法具有较高的精度,能够适用于变负载变耦合的WPT运行工况。Applying parameter identification technology,the secondary side parameters of wireless power transfer(WPT)systems,such as the load parameters,can be obtained without the wireless communication and sensors.It will benefit the WPT control and condition monitoring.This article presented a WPT multiple parameter joint identification method.Through this method,joint identification of the battery voltage,charging current,rectifier equivalent input impedance,secondary side voltages and currents was achieved,based on only one primary side measured voltage without knowing the coil coupling state in advance.First,an equivalent circuit model of WPT system was established to get the independent relationship between the voltage across the primary side parallel compensation capacitor and the secondary side impedances.Then,piecewise linearization of the rectifier equivalent input impedance was adopted,and the stray resistances of the WPT secondary side compensation capacitors were ignored.These methods can simplify the identification algorithm while ensuring the accuracy.Furthermore,the quantitative relationships between the WPT measured variables and identified parameters were deduced.Meanwhile,the specific identification process and steps were described.Finally,an experimental platform was developed and the experimental results indicate that under the conditions of the varied load and different coil coupling,the maximum identification errors of the battery voltage,charging current,rectifier equivalent input resistance,reactance,secondary side voltage and current are 5.5%,5.2%,6.4%,6.5%,7.9%,and 6.9%,respectively.Therefore,the proposed method can achieve relatively high accuracy,and it is suitable for the WPT working conditions of varied load and varied coupling.

关 键 词：无线电能传输 参数辨识 变负载变耦合 整流桥等效输入阻抗 双边LCC补偿 

分 类 号：TM72[电气工程—电力系统及自动化] TM15