基于小波滤波的快速阶跃响应全光纤电流互感器  

Fast Step Response All-Fiber Current Transformer Based on Wavelet Filtering

作　　者：丁晔[1] 刘东超[1] 赵森林[1] 须雷[1] 罗苏南[1] 阎嫦玲[1] 邓劲东 DING Ye;LIU Dongchao;ZHAO Senlin;XU Lei;LUO Sunan;YAN Changling;DENG Jindong(NR Electric Co.,Ltd.,Nanjing Jiangsu 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《湖北电力》2023年第6期60-65,共6页Hubei Electric Power

基　　金：国家电网公司科技项目(项目编号:520626160052)。

摘　　要：近些年随着全光纤电流互感器在直流行业的规模化应用,其精度问题日益引起研究者的关注。在光学系统与电路系统提升精度受限的情况下,通过算法提升精度是比较可行的选择方案。但是传统的滤波算法通常以牺牲时间换取精度为主,导致光纤电流互感器在满足精度的同时无法兼顾阶跃响应。针对上述问题,提出了一种在解调之前针对原始信号做小波滤波的方法。仿真发现,db4小波基对方波信号有较好的滤波效果。实验证明,在FPGA中对闭环方波信号做5层db4小波滤波,可以在提升测量精度的同时大幅压缩滤波时间。In recent years,with the large-scale application of all-fiber current transformer in DC industry,its accuracy has attracted increasing attention from researchers.In the case of limited increasing accuracy of optical system and circuit system,improving accuracy by algorithm is a feasible choice.However,traditional filtering algorithms usually sacrifice time in exchange for accuracy,which causes the fiber optic current transformer to fail considering the step response while meeting the accuracy.In order to solve the aforementioned problems,a method of wavelet filtering for the original signal before demodulation is proposed.Simulation finds that db4 wavelet base has a better filtering effect on square-wave signal.Experiments show that 5-layer db4 wavelet filtering on closed-loop square-wave signal in FPGA can greatly reduce the filtering time while improving the measure accuracy.

关 键 词：柔性直流输电 直流互感器 阶跃响应 全光纤电流互感器 小波滤波 

分 类 号：TM721.1[电气工程—电力系统及自动化]