基于副边解耦极板的电容式无线电能传输系统拾取端失谐评估  

Detuning Estimation of Pickup Loop in Capacitive Wireless Power Transfer System Based on Secondary-side Decoupled Capacitive Coupler

作　　者：周玮 郑宇锋 陈泽林 李志强 易云天 麦瑞坤[1] ZHOU Wei;ZHENG Yufeng;CHEN Zelin;LI Zhiqiang;YI Yuntian;MAI Ruikun(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市611756

出　　处：《电力系统自动化》2024年第3期142-149,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金联合基金重点项目(U22A20222A);四川省科技计划资助项目(2021YFH0039);四川省自然科学基金重大项目(2023NSFSC0001)。

摘　　要：对于电容式无线电能传输(CWPT)系统,准确评估拾取端回路的失谐程度是维持系统谐振稳定的前提。然而,由于系统拾取端的感应电压无法被直接观测,难以通过测量感应电压和回路电流间的相位差来评估拾取端回路的失谐程度。文中提出一种能够间接测量拾取端感应电压相位信息,评估拾取端回路失谐程度的CWPT系统。基于Z参数建立三端口CWPT系统的数学模型和等效电路,并依托该模型提出一种基于副边解耦极板的耦合机构。分析在感应电压测量和失谐程度评估过程中存在的误差,提出拾取端回路失谐程度的评估校正方法。搭建了带有副边解耦极板的CWPT系统原理样机,实验结果表明,拾取端谐振时的失谐程度评估误差不超过1Ω,拾取端感性/容性失谐时的失谐程度评估误差分别小于2%和5%。For the capacitive wireless power transfer(CWPT)system,the accurate estimation of the pickup detuning degree is the premise for the system to maintain resonance.However,because the induced voltage at the pickup loop of the system cannot be directly observed,it is difficult to estimate the detuning degree of the pickup loop by measuring the phase difference between the induced voltage and the loop current.A CWPT system for indirectly measuring the phase information of the induced voltage at the pickup loop is presented and the detuning degree of the pickup loop is evaluated.Based on the Z parameters,the mathematical model and equivalent circuit of the three-port CWPT system are established.Based on the model,a secondary-side decoupled capacitive coupler is proposed.The errors in the measurement of induced voltage and the estimation of detuning degree are analyzed,and the correction method for the detuning degree of the pickup loop is proposed.A prototype of the proposed CWPT system with secondary-side decoupled coupler is constructed.Experimental results indicate that the estimation error of the detuning degree shall not exceed 1Ωwhen the pickup fully tunes,and the estimation error of the detuning degree under the inductive detuning and capacitive detuning conditions shall be less than 2%and 5%,respectively.

关 键 词：无线电能传输 极板 副边解耦 失谐程度评估 相位检测 

分 类 号：TM724[电气工程—电力系统及自动化]