基于电压源型PWM整流电路的输电线路测量与感应取电一体化互感器实现方法  

Implementation Method of Integrated Transformer for Transmission Line Measurement and Inductive Power Taking Based on Voltage Source PWM Rectifier

作　　者：王祎凡 任春光[1] 张佰富 杨宇 韩肖清[1] Wang Yifan;Ren Chunguang;Zhang Baifu;Yang Yu;Han Xiaoqing(Shanxi Provincial Key Laboratory of Power System Operation and Control Taiyuan University of Technology,Taiyuan 030024 China;State Grid Shanxi Electric Power Company Maintenance Branch,Taiyuan 030024 China)

机构地区：[1]太原理工大学电力系统运行与控制山西省重点实验室,太原030024 [2]国网山西省电力公司检修分公司,太原030024

出　　处：《电工技术学报》2023年第1期15-25,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51807130);山西省高等学校科技创新项目(2020L0065);山西省重点研发计划(202102060301012)资助。

摘　　要：输电线路在线监测技术是实现能源互联与输配电系统安全稳定运行的重要保障。传统的电流互感器(CT)为在线监测设备供电时,输电线电流的大范围波动,不仅会导致小电流时CT取能不足、大电流时CT磁心饱和的问题,而且会进一步影响输电线路电流实时监测的准确性。针对上述问题,该文提出一种基于电压源型PWM整流电路(VSR)的测量与感应取电一体化互感器的实现方法,根据CT一次电流的大小控制VSR工作在不同模式,实现CT二次侧阻抗从容性到感性的动态调节,保证取电CT在一次电流大范围变化时,维持稳定的输出电压。同时通过对二次侧等效阻抗及励磁电流进行等效建模及计算,从而实现对一次电流的精确测量。仿真与实验验证了该方案的有效性。The online monitoring technology of transmission lines is an important guarantee for realizing the safe and stable operation of energy interconnection and transmission and distribution systems.When the traditional current transformer(CT)supplies power to the online monitoring equipment,the large fluctuation of the current will lead to the problem of insufficient energy harvest of the CT at low current and saturation of the CT magnetic core at high current.In measurement,traditional CT has measurement error due to the excitation current and is susceptible to the influence of winding abnormal current.To address these issues,this paper proposes an implementation method of the integrated transformer based on voltage source PWM rectifier(VSR)for measurement and induction energy.This method controls the VSR to work in different modes according to the magnitude of the CT primary side current,thus achieving accurate measurement of the excitation current and primary side current.Firstly,a scheme of core selection and turn number design is presented,which can effectively reduce the volume and weight of CT.Secondly,control modes of VSR is described,which can be divided into four parts:full compensation,partial compensation,no compensation and demagnetization control.Thirdly,the discriminant criteria for VSR in each mode of operation and the applicable current range for each mode are introduced.Fourthly,the control strategy of each mode and its effect after control are introduced,which can output a continuously stable voltage and maintain the excitation impedance within a constant range for a long time.Finally,the measurement method of excitation current and the corresponding calculation method of primary side current in each mode are introduced,which can avoid the error caused by the nonlinear characteristics of the iron core and the change of the excitation current to accurately obtain the primary side current.In this integrated strategy,the VSR is dynamically adjusted according to the primary side current to output and st

关 键 词：感应取能 电流监测 稳定输出电压 电流互感器 

分 类 号：TM452[电气工程—电器]