基于阻抗控制的电流互感器取能控制策略研究  

Current Transformer Energy Harvesting Control Strategy Based on Impedance Control

作　　者：宁杰 王磊[1] 张佰富 任春光[1] 杨宇[2] 韩肖清[1] NING Jie;WANG Lei;ZHANG Baifu;REN Chunguang;YANG Yu;HAN Xiaoqing(Shanxi Key Laboratory of Power System Operation and Control(Taiyuan University of Technology),Taiyuan 030024,China;UHV Transmission Branch,State Grid Shanxi Electric Power Company,Taiyuan 030024,China)

机构地区：[1]电力系统运行与控制山西省重点实验室(太原理工大学),太原030024 [2]国网山西省电力公司超高压输电分公司,太原030024

出　　处：《电力系统及其自动化学报》2024年第3期39-47,共9页Proceedings of the CSU-EPSA

基　　金：山西省科学技术厅重大科技专项项目(202102060301012);山西省基础研究计划青年科学研究资助项目(202203021212288)。

摘　　要：针对电流互感器取能电源在输电线路小电流时存在供能死区、大电流时CT铁芯深度饱和导致异常运行状态的问题,提出一种阻抗控制式电流互感器取能控制方法。首先,建立取能CT等效电路模型,运用负载阻抗分析方法,对取能系统励磁特性问题展开研究;其次,给出阻抗控制式取能电路拓扑结构,并考虑不同原边电流工况的影响,对取能电流互感器提出阻抗调节控制策略;最后,搭建电流互感器取能综合实验平台进行实验验证,实验结果表明,容性阻抗运行特性的调节,显著提升了小电流工况下的系统取电功率,而在大电流工况下,感性阻抗运行特性使得铁芯的饱和状态得到抑制,可向负载提供稳定的电压和功率。The current transformer(CT)energy harvesting power supply has an energy supply dead zone when there is a small current in transmission lines,while the CT core is deeply saturated in the case of a large current,which will result in an abnormal operation state.Aimed at this problem,a CT energy harvesting control method based on impedance control is proposed.First,an equivalent circuit model for the energy harvesting CT is established,and the load impedance analysis method is applied to study the excitation characteristics of the energy harvesting system.Second,the topology of the impedance controlled energy harvesting circuit is given,and an impedance regulation control strategy for the energy harvesting CT is proposed considering the influence of different primary current conditions.Finally,a comprehensive experimental platform for CT energy harvesting was built for validation.Experimental results show that the regulation of capacitive impedance operating characteristics significantly improves the system power harvesting under small current conditions.In comparison,the inductive impedance operating characteristics suppress the core’s saturation state under large current conditions,thereby providing stable voltage and power to the load.

关 键 词：电流互感器 阻抗控制 动态调节 抑制饱和 稳定输出功率 

分 类 号：TM452[电气工程—电器]