基于有源整流的无线电能传输系统双边LCL零电压软开关控制策略  

Two-Sided LCL Zero Voltage Switching Control Strategy Based on Active Rectifier for Wireless Power Transfer System

作　　者：李争 于治昊 高世豪 唐明磊 孙鹤旭 Li Zheng;Yu Zhihao;Gao Shihao;Tang Minglei;Sun Hexu(School of Electrical Engineering Hebei University of Science and Technology,Shijiazhuang 050018 China;School of Electrical Engineering Yanshan University,Qinhuangdao 066004 China)

机构地区：[1]河北科技大学电气工程学院,石家庄050018 [2]燕山大学电气工程学院,秦皇岛066004

出　　处：《电工技术学报》2025年第8期2380-2392,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51877070,U20A20198);河北省自然科学基金(E2024208079,E2021208008)资助项目。

摘　　要：在无线电能传输(WPT)系统中,为了实现精确的电压调节和系统的高效率运行,同时避免增加额外的DC-DC变换电路和谐振元件,该文提出一种双边LCL移相控制策略。该策略通过调节逆变器和有源整流器(AR)的内外移相角,实现恒压输出和所有开关管的零电压开通。通过对系统的功率损耗进行分析,得出系统最大效率运行时变流器内移相角之间的约束条件。基于此约束条件,进一步确定了实现零电压软开关(ZVS)的最小外移相角,从而实现了系统的高效率运行。此外,引入功率角作为中间变量,利用压控振荡器(VCO)实现AR的频率同步,从而使系统控制更加简便,同时提高了控制精度。最后,搭建了一台50 W的实验样机,验证了理论的有效性;根据实验结果,在耦合系数k=0.31的情况下,系统的传输效率可达93.8%。In wireless power transfer(WPT)systems,achieving accurate voltage regulation and operation are critical.Current research achieves constant voltage output and zero voltage switch(ZVS)with additional DC-DC converters and variable resonant networks.However,these approaches increase system losses and costs.Therefore,this paper proposes a two-sided LCL phase-shifting control strategy.The internal phase shift angle of the inverter and active rectifier(AR)is used to achieve constant voltage output and maximum efficiency tracking,and the external phase shift angle between the two converters achieves ZVS of all switching tubes.By analyzing the power loss,the constraint condition between the internal phase shift angle is obtained.The minimum external phase shift angleδopt of ZVS is further determined,and the system’s high efficiency is realized.In addition,the power angleθpower is introduced as the intermediate variable,and the frequency synchronization of the primary and secondary sides is realized using the voltage-controlled oscillator(VCO).Firstly,utilizing the fundamental wave equivalent model,the constant voltage characteristics of the system and the constraint conditions of the inverter output voltage and AR input voltage pulse-width ratio D1 and D2 are analyzed.The results show that transmission efficiency peaks when the AC voltage ratioα=1.With load variations,achieving constant voltage output and maximum efficiency tracking is feasible by adjusting D1 and D2.Secondly,based on the time-domain harmonics model,the derivation and simplification of the time-domain expression of inductance current are conducted.The simplified model is then analyzed to determine the external phase shift angleδ.By comparingδof the inverter and AR,theδopt is obtained.Thirdly,the overall control strategy is introduced.The constant voltage output is achieved by adjusting D1 and D2.The introduction ofθpower as an intermediate variable establishes the relationship betweenδandθpower,enabling indirect control ofδthrough the regulati

关 键 词：无线电能传输 移相控制 有源整流 零电压软开关 

分 类 号：TM724[电气工程—电力系统及自动化]