基于CEEMDAN-ZCR的光纤电流互感器非线性误差识别  

Nonlinear error recognition of FOCT based on CEEMDAN-ZCR

作　　者：王立辉[1] 张文鹏 安义岩 WANG Lihui;ZHANG Wenpeng;AN Yiyan(School of Instrument Science and Engineering,Southeast University,Nanjing 210096,China;State Grid East Inner Mongolia Electric Power Research Institute,Hohhot 010020,China)

机构地区：[1]东南大学仪器科学与工程学院,江苏南京210096 [2]国网内蒙古东部电力有限公司电力科学研究院,内蒙古自治区呼和浩特010020

出　　处：《电力工程技术》2022年第4期199-204,共6页Electric Power Engineering Technology

基　　金：国家重点研发计划资助项目(2021YFB2501603);国家电网有限公司科技项目(5700-202018483A-0-0-00)。

摘　　要：针对光纤电流互感器(FOCT)漂移、变比波动等非线性误差难以识别的问题,文中提出一种基于自适应噪声完备集合经验模态分解(CEEMDAN)-过零率(ZCR)的FOCT误差识别方法。首先,利用CEEMDAN算法对FOCT输出电流信号进行分解,得到包含非线性误差特征的固有模态分量(IMF),构成原始误差向量数据集;然后,对比不同误差下的分量数量,利用ZCR算法计算不同误差下各个IMF的ZCR指标,用于将IMF分类;最后,根据ZCR指标将IMF信号分为3类,并叠加重组为3个分量,构建出分解结果数量稳定的IMF信号,根据不同分量的特征实现误差识别。实验结果表明:基于CEEMDAN-ZCR的误差识别方法能够有效识别2种误差,漂移误差特征主要集中在IMF中第三层(C3),变比误差主要集中在IMF中第二层(C2)。Focusing on the problem that it is difficult to distinguish the nonlinear errors such as drift error and ratio error of fiber optic current transformer(FOCT),an error recognition method based on complete ensemble empirical mode decomposition with adaptive noise(CEEMDAN)and zero-crossing rate(ZCR)is proposed.Firstly,the output signal of the FOCT is decomposed using CEEMDAN algorithm to obtain the intrinsic mode functions(IMF)containing nonlinear error characteristics,which constitutes the original error vector data set.Then,the number of components under different errors is compared.The ZCR index of each IMF component under different errors is calculated by ZCR algorithm.The results are used to classify the IMF.Finally,the IMF component signals are divided into three categories according to the ZCR index.IMF components are superimposed and reorganized into three components,and IMF component signals with stable number of decomposition results are constructed.Error identification is realized according to the expression forms of different components.Experiment results show that the CEEMDAN-ZCR based error recognition method can effectively identify the two kinds of errors.The drift error characteristics are mainly concentrated in the third layer of IMF(C3),and the variation ratio error is mainly concentrated in the second layer of IMF(C2).

关 键 词：光纤电流互感器(FOCT) 漂移误差 变比误差 自适应噪声完备集合经验模态分解(CEEMDAN) 过零率(ZCR) 误差识别 

分 类 号：TM452[电气工程—电器]