基于EMD滤波改进的直流电流互感器现场测试研究  

DC Current Transformer Field Test System Based on EMD Filtering

作　　者：杨朋威 万全 刘春晖 陈更 许才 YANG Pengwei;WAN Quan;LIU Chunhui;CHEN Geng;XU Cai(Electric Power Research Institute,State Grid East Inner Mongolia Electric Power Company Limited,Hohhot 010000,Nei Moggol,China)

机构地区：[1]国网内蒙古东部电力有限公司电力科学研究院,内蒙古呼和浩特010000

出　　处：《电气传动》2021年第13期8-13,共6页Electric Drive

摘　　要：直流电流互感器是高压直流输电系统的核心设备,其现场测试系统设计的合理性、准确性对直流输电系统尤为重要。对当前直流电流互感器现场测试系统存在误差的原因进行分析,提出了改进的直流电流互感器现场闭环测试方法。该方法通过高精度同步模块实现标准源模拟量和被测数字量的同步采集,解决了延时造成的误差;通过18位高精度A/D采集并引入EMD算法对电流直流分量进行提取,滤除了大量谐波,提高了测试系统的测量精度;设计了用于直流电流互感器暂态阶跃响应测试的阶跃源系统,并通过实验证明了该系统的可行性。提出的改进的直流电流互感器闭环测试系统由于解决了延时误差,减小了谐波误差,可提高测试系统的测量精度,并且由于EMD算法计算简单可靠,有较高的工程应用性。The DC current transformer is the core equipment of the HVDC transmission system.The rationality and accuracy of the field test system design are especially important for the DC transmission system.The causes of the error of the DC current transformer field test system were analyzed,and an improved on-site closed-loop test method for DC current transformer was proposed.The synchronous acquisition of the standard source analog quantity and the measured digital quantity was realized through the high-precision synchronization module,and the error caused by the delay was solved by this method.The current DC component was also extracted through the 18-bit high-precision A/D acquisition and the EMD algorithm,and a large number of harmonics was filtered,and the measurement accuracy of the test system was improved.The step source system for transient step response test of DC current transformer was designed,and the feasibility of the system was proved by experiments.The proposed improved DC current transformer closed-loop test system solves the delay error and reduces the harmonic error,which can improve the measurement accuracy of the test system.And as the EMD algorithm is simple and reliable,it has high engineering applicability.

关 键 词：直流电流互感器 同步测试 绝对延时 经验模态分解 阶跃特性 

分 类 号：TM28[一般工业技术—材料科学与工程]