基于S-G滤波的电流互感器饱和检测  

Current transformer saturation detection based on Savitzky-Golay filter

作　　者：王凌云 李开成 肖厦颖 田肇光 孟庆旭 蔡德龙 Wang Lingyun;Li Kaicheng;Xiao Xiaying;Tian Zhaoguang;Meng Qinxu;Cai Delong(School of Electrical and Electronic Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《电测与仪表》2018年第6期76-81,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51277080)

摘　　要：针对目前传统基于差分方程的电流互感器饱和检测方法易受噪声影响的问题,提出了一种基于SavitzkyGolay(S-G)滤波器的电流互感器饱和检测新方法。该方法将传统的差分方程和S-G滤波器相结合,可在信噪比较低的情况下准确检测出电流互感器的入饱和点。在电流互感器入饱和点准确检测的基础上,电流积分法可用于检测电流互感器的出饱和点。推导了差分方程结合S-G滤波器后的相关阈值,并使用PSCAD/EMTDC对新方法进行了仿真测试。仿真结果表明:基于S-G滤波的电流互感器饱和检测方法具有算法简单、检测精度高、抗噪声干扰能力强等优点。new method of current transformer saturation detection based on Savitzky-Golay(S-G)filter is proposed.The method combines the traditional difference equation and the S-G filter,can accurately detect the saturation point of the current transformer in the condition of low signal noise ratio.On the basis of current transformer saturation start time,the current integration method can be used to accurately detect the end of current transformer saturation.The threshold value of the differential equation method combined with the S-G filter is derived,and the new method is simulated by PSCAD/EMTDC.The simulation results show that the current transformer saturation detection method based on S-G filter has the advantages of simple algorithm,high detection precision,strong anti-interference ability and so on.

关 键 词：电流互感器饱和 S-G滤波器 差分方程 PSCAD仿真 

分 类 号：TM75[电气工程—电力系统及自动化]