直流光纤电流互感器宽频测量特性

LI Chuansheng

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直流光纤电流互感器宽频测量特性

更新时间：2025-08-13

- 直流光纤电流互感器宽频测量特性
- Automation of Electric Power Systems Vol. 41, Issue 20, Pages: 151-156(2017)
- 作者机构：
  
  中国计量科学研究院,北京市,100029
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2017
- 稿件说明：
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LI Chuansheng. [J]. Automation of electric power systems, 2017, 41(20): 151-156.
DOI：

LI Chuansheng. [J]. Automation of electric power systems, 2017, 41(20): 151-156. DOI：

摘要

针对高压直流输电系统直流电流测量装置宽频测量的实际需求，结合国家标准要求，研究了直流光纤电流互感器的频率响应和阶跃响应特性及性能改善方法。考虑反馈延时、调制器驱动电路二阶频响特性及滑动平均输出滤波器的影响，建立了直流光纤电流互感器高阶离散域数学模型，分析了互感器的频率响应和阶跃响应特性，确定了闭环信号检测系统的前向增益和输出滤波器的阶数是影响互感器宽频测量性能的关键因素。通过仿真计算，优化配置前向增益和滤波器阶数，可在抑制超调的同时，提高互感器的宽频电流测量准确度及带宽。搭建了直流光纤电流互感器频率响应测试平台，提出了阶跃响应等效测试方法。实验结果表明样机的宽频测量性能可满足GB/T 26216.1—2010的要求。

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.

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