磁耦合谐振式无线电能传输系统频率分裂抑制方法  

A Method of Preventing Frequency Splitting in Magnetic Coupling Resonant Wireless Power Transfer System

作　　者：李中启[1,2] 黄守道[2] 易吉良[1] 李军军[1] 

机构地区：[1]湖南工业大学交通工程学院,湖南省株洲市412008 [2]湖南大学电气与信息工程学院,湖南省长沙市410082

出　　处：《电力系统自动化》2017年第2期21-27,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(61104088);湖南省自然科学基金与常德市联合资助项目(13JJ9023)~~

摘　　要：磁耦合谐振式无线电能传输系统工作在过耦合状态时,会发生频率分裂,导致系统在原谐振频率处的效率变低。文中运用等效电路理论,推导出了效率、输入阻抗与频率的关系表达式,并以此为基础,分析了频率分裂现象,得到了影响系统频率分裂和效率的几个关键参数。随后提出了一种调节系统关键参数的方法,为了调节系统参数,提出了使用L型阻抗匹配网络来调节等效负载电阻的方法。使用所述方法可以有效抑制系统的频率分裂现象及提高系统效率。最后,设计开发了一套磁耦合谐振式无线电能传输系统装置,仿真和实验结果验证了该方法的有效性与正确性。When the wireless power transfer（WPT）system operates in an over-coupled state,the efficiency becomes low because frequency split phenomenon occurs.The expression for the relationship among the efficiency,the input impedance and the operating frequency is derived by the equivalent circuit theory（ECT）.Frequency splitting is analyzed and the effects of key parameters on frequency splitting and efficiency are obtained.Then a method of adjusting the parameters is proposed.The Ltype impedance matching network is used to adjust the equivalent load resistor.Frequency splitting phenomenon can be suppressed and the efficiency can be improved by the proposed method.Finally,a magnetic coupling resonant WPT system is designed and created.Simulation and experimental results have verified the validity of the theory.

关 键 词：频率分裂 参数匹配 无线电能传输 L型阻抗匹配网络 

分 类 号：TM724[电气工程—电力系统及自动化]