电测与仪表2025，Vol.62Issue(10)：106-114,9.DOI:10.19753/j.issn1001-1390.2025.10.012
基于SPWM的双闭环控制下低压电流互感器全量程升流技术研究
Research on full-range current-raising technology of low-voltage current transformer under SPWM-based double closed-loop control
摘要
Abstract
Focusing on the application of an optimized current injection control system for low-voltage type current transformer banding measurement,this paper aims to achieve accurate autonomous modulation of industrial frequen-cy current under dynamic working conditions.A charged circuit modulation system based on sinusoidal pulse width modulation(SPWM)technology is constructed,which generates an AC signal through an inverter circuit and works in concert with the transformer to quickly and accurately inject current into the measured circuit.For the delay problem,the effects of filter circuit and actuator response are analyzed,and double closed-loop control strategy are adopted to effectively reduce the filtering pressure and decrease the hysteresis delay.The system stability is verified using the root trajectory method,and the proportional-integral(PI)control parameters are optimized by the frequen-cy domain analysis method.Simulink simulation results show that the injected current control system realizes auton-omous modulation of the industrial frequency current in the range of 1％to 120％of the rated current.Finally,the full-range regulation of the test loop current under charged conditions is successfully achieved,providing a reliable solution for high-precision current measurement in power system.关键词
电流调控/SPWM技术/双闭环控制系统Key words
current regulation/SPWM technology/double closed-loop control system分类
信息技术与安全科学引用本文复制引用
尹文庆,王永超,李宁..基于SPWM的双闭环控制下低压电流互感器全量程升流技术研究[J].电测与仪表,2025,62(10):106-114,9.基金项目
国网新疆电力公司科技项目(5230YX240002) （5230YX240002）
