电力系统自动化2017，Vol.41Issue(20)：151-156,6.DOI:10.7500/AEPS20170301012
直流光纤电流互感器宽频测量特性
Wide-frequency Measurement Characteristics of DC Fiber-optic Current Transformer
摘要
Abstract
In order to satisfy the demands for the wide-frequency current measurement of the DC current measuring device for HVDC transmission systems,by referring to the requirements of the national standard,the frequency response characteristics and step response characteristics and performance improvement method of the DC fiber-optic current transformer (FOCT) are investigated.Meanwhile,considering the effect of feedback delay,two-order frequency response characteristic of the phase modulation circuit and moving average output filter,the high-order mathematical model in the discrete domain of the DC FOCT is developed.It is ascertained by the simulation analysis of the frequency response characteristic and step response characteristics of the DC FOCT that the forward gain of the closed-loop signal-detecting system and the order of output filter are both crucial factors affecting the wide-frequency current measurement accuracy.The overshoot can be suppressed,and the wide frequency current measurement accuracy and bandwidth of the DC FOCT can be improved by the optimization of the forward gain and order of the output filter.The test device for the frequency response of the DC FOCT is built,and the equivalent test method of the step response is also presented.It is shown by experimental results that the wide frequency measurement performance of DC FOCT can meet the requirements specified in GB/T 26216.1-2010.关键词
直流光纤电流互感器/宽频电流测量/频率响应/阶跃响应/前向增益Key words
DC fiber optic current transformer/wide-frequency current measurement/frequency response/step response/forward gain引用本文复制引用
李传生,邵海明,赵伟,王家福..直流光纤电流互感器宽频测量特性[J].电力系统自动化,2017,41(20):151-156,6.基金项目
国家重点研发计划资助项目(2016YFF0102401).This work is supported by National Key Research and Development Program of China (No.2016YFF0102401). （2016YFF0102401）
