中国电机工程学报2024，Vol.44Issue(24)：9811-9819,中插25,10.DOI:10.13334/j.0258-8013.pcsee.231473
基于电压型整流器等效阻抗在线匹配取能方法研究
Research on Energy Harvesting Method of Online Matching Based on Voltage Source Rectifier Equivalent Impedance
摘要
Abstract
To solve the problems of current transformer(CT)inductive energy harvesting mode in transmission lines,such as difficulty in obtaining maximum power at low current,easy saturation of magnetic core at high current and unstable energy harvesting caused by current fluctuation of transmission line,this paper proposes an online energy harvesting method based on equivalent impedance matching of voltage source rectifier(VSR)was proposed.First,a VSR energy harvesting equivalent circuit model is constructed,and the relationship between the parameters of the circuit model and the output power of CT is deduced.Then,considering the characteristic of CT as a current source(the port voltage amplitude is determined by the transmission line current,excitation parameters and load characteristics),a control strategy of constant d-axis current,constant DC voltage outer loop and q-axis current inner loop is proposed.The amplitude and phase of VSR port voltage and current are controlled in real time,VSR is equivalent to the adjustable impedance to dynamically match with CT excitation impedance,and then the CT port voltage is indirectly controlled to a fixed value.With the aim of verifying the effectiveness of the method in this paper,simulation and experimental systems are built.The results show that the equivalent impedance of VSR is capacitive when the transmission line current is low,which can achieve the maximum power output of CT at low current of the transmission line,and the equivalent impedance of VSR is inductive when the transmission line current is high,which can inhibit the saturation of CT magnetic core.It can meet the power supply requirements of some low-power devices on transmission lines.关键词
感应取能/电压型整流器/等效阻抗/动态匹配Key words
inductive energy harvesting/voltage source rectifier/equivalent impedance/dynamic matching分类
信息技术与安全科学引用本文复制引用
唐欣,唐凯璇,李珍,肖超凡,李泽宇..基于电压型整流器等效阻抗在线匹配取能方法研究[J].中国电机工程学报,2024,44(24):9811-9819,中插25,10.基金项目
国家自然科学基金项目(52377167).Project Supported by National Natural Science Foundation of China(52377167). （52377167）
