摘要
为解决无线电能传输系统参数变化导致的频率失谐问题,建立电能传输的磁耦合等效模型,研究系统的频率跟踪控制原理,揭示耦合系数、负载等参数变化对系统电压增益和跨导增益的影响规律,得到开关管工作在零电压开关状态下的实现条件及开关频率的变化范围。在此基础上,提出基于数字信号处理技术的电流过零比较与动态时滞的数字锁相环和系统阻抗角调节的控制方法,实现电压电流的频率和相位跟踪,结合电压外环、电流内环的双闭环控制实现恒压或恒流输出。最后,搭建实验平台验证控制方法的可行性和有效性,结果表明:改变气隙距离能够快速实现电压电流频率和相位的跟踪控制,且当气隙距离大于一定值时,所提方法得到的传输效率比固定频率控制时提高4%以上,验证了控制方法的有效性。
To solve the problem of frequency detuning caused by the parameters variations of the wireless power transfer system,the magnetic coupling equivalent model of power transmission was established to study the system frequency tracking control principle,and to reveal the influence of coupling coefficient and load parameters on the system voltage gain and transconductance gain.The realization conditions of the switching tube working in the state of zero voltage switch and the variation range of the switching frequency were obtained.On this basis,the control method of digital phase-locked loop and system impedance angle adjustment based on the digital signal processing technology of current zero-crossing comparison and dynamic time delay was proposed to realize the frequency and phase tracking of voltage and current,which was combined with the double closed-loop control of voltage outer loop and current inner loop to realize constant voltage or constant current output.Finally,an experimental platform was built to verify the feasibility and effectiveness of the proposed control method.The experimental results show that the frequency and phase tracking control of the voltage and current can be realized by changing the air gap distance.When the air gap distance is greater than a certain value,the transmission efficiency of the proposed method is more than 4% higher than that of fixed frequency control method,which verifies the effectiveness of the control method.
作者
罗进
徐笑娟
陈兆权
冯德仁
沈浩
LUO Jin;XU Xiaojuan;CHEN Zhaoquan;FENG Deren;SHEN Hao(Key Laboratory of Power Electronics and Motion Control of Anhui Higher Education Institutions,Anhui University of Technology,Maanshan 243032,China)
出处
《安徽工业大学学报（自然科学版）》
CAS
2023年第2期181-190,共10页
Journal of Anhui University of Technology（Natural Science）
基金
国家自然科学基金项目(52177126)
教育部产学合作协同育人项目(202102266003,202102266018)
安徽省自然科学基金项目(2108085QE231)
电力电子与运动控制安徽普通高校重点实验室开放基金项目(PEMC2002)
安徽省教学研究重点项目(2021jyxm0173)
安徽省线下精品课程项目(2021xxkc013)。
关键词
无线电能传输
失谐
弱感性
数字锁相环
频率跟踪
动态时滞
wireless power transfer
detuning
weak inductance
digital phase locked loop
frequency tracking
dynamic time delay
