无线电能传输系统中有源阻抗匹配网络断续电流模式最大效率跟踪研究  

Maximum Efficiency Tracking Study of Active Impedance Matching Network Discontinous Current Mode in Wireless Power Transfer System

作　　者：赵进国 赵晋斌 张俊伟 毛玲 屈克庆 Zhao Jinguo;Zhao Jinbin;Zhang Junwei;Mao Ling;Qu Keqing(College of Electrical Engineering Shanghai University of Electric Power,Shanghai 200082 China)

机构地区：[1]上海电力大学电气工程学院,上海200082

出　　处：《电工技术学报》2022年第1期24-35,共12页Transactions of China Electrotechnical Society

基　　金：上海自然科学基金资助项目(21ZR1425300)。

摘　　要：针对无线电能传输系统(WPT)中传输效率对耦合系数、负载变化敏感的特点,该文提出一种基于断续电流模式(DCM)有源阻抗匹配网络的最大效率跟踪方法。首先,分析不同DCDC变换器输入阻抗表达式,证明了DCM模式Buck-Boost变换电路阻抗匹配的优越性。其次,给出了一种基于耦合系数辨识的最大效率跟踪控制策略,无需负载实时监测及进一步跟踪控制,即可在较大负载变化范围内使系统传输效率实现最大化并保持稳定;耦合系数变化时,系统也可根据发射接收侧电压电流信息实时辨识耦合系数并通过接收侧变换器占空比调节实现自适应最大效率跟踪。最后,利用实验验证了该方法的可行性和有效性,并且在动态响应、提高传输效率等方面有明显优势。Aiming at the characteristics that the transmission efficiency is sensitive to the coupling coefficient and load change in wireless power transfer(WPT)system,this paper proposes a maximum efficiency tracking method based on the intermittent current mode(DCM)active impedance matching network.First,We analyzed expressions of different DC-DC converter inputs impedance to demonstrate the superiority of impedance matching of the DCM mode Buck-Boost transform circuit.Secondly,a maximum efficiency tracking control strategy based on the coupling coefficient identification was given,which can maximize and stabilize the large load transmission efficiency without real-time load monitoring and further tracking control.When the coupling coefficient changes,the system could also identify the coupling coefficient in real time according to the transmit and receive side voltage and current information,and realize the adaptive maximum efficiency tracking through adjusting the receiver side converter duty cycle.Finally,the feasibility and effectiveness of the method are verified and has obvious advantages in dynamic response and improved transmission efficiency.

关 键 词：无线电能传输 最大效率跟踪 断续电流模式 阻抗匹配 

分 类 号：TM724[电气工程—电力系统及自动化]