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直流光纤电流互感器谐波测量误差机理及改善

Harmonic Measurement Error Mechanism and Performance Improvement of Direct-Current Fiber-Optic Current Transformer

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摘要

研究了直流光纤电流互感器(DC FOCT)谐波测量误差的产生机理及性能改善方法, 建立了互感器闭环信号检测系统和滑动平均输出滤波器的离散域数学模型, 对互感器的频率响应特性进行了仿真分析。研究表明, 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谐波电流测量准确度的主要因素; 在闭环稳定的前提下增大前向增益, 同时降低输出滤波器的阶数, 可有效减小谐波电流的测量误差。搭建了DC FOCT谐波电流测量误差测试平台, 实验结果表明, 在50~1200 Hz范围内, 样机测量误差不超过0.5%, 带宽大于10 kHz。

Abstract

The harmonic measurement error mechanism and performance improvement method of the direct-current fiber-optic current transformer (DC FOCT) are investigated. The mathematical models in the discrete domain of the closed-loop signal-detecting system and the moving average output filter are established. The simulation analysis is carried out on the frequency response characteristic of the transformer. The study results show that the forward gain of the closed-loop detection system and the order of the output filter are both crucial factors affecting the harmonic current measurement accuracy. The harmonic current measurement error can be effectively decreased by increasing the forward gain under the condition of the stabilization of the closed-loop system and simultaneously by reducing the order of the output filter. The test platform for the harmonic current measurement error of the DC FOCT is built. The experimental results show that, in the range of 50-1200 Hz, the measurement error of the model machine is less than 0.5% and the bandwidth is more than 10 kHz.

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中图分类号:O436

DOI:10.3788/cjl201744.0910002

所属栏目:遥感与传感器

基金项目:国家重点研发计划重大科学仪器设备开发专项(2016YFF0102401)

收稿日期:2017-02-20

修改稿日期:2017-05-12

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李传生:中国计量科学研究院电磁计量科学技术研究所, 北京 100029
赵伟:中国计量科学研究院电磁计量科学技术研究所, 北京 100029
王家福:中国计量科学研究院电磁计量科学技术研究所, 北京 100029
邵海明:中国计量科学研究院电磁计量科学技术研究所, 北京 100029

联系人作者:李传生(lichsh@nim.ac.cn)

备注:李传生(1984-), 男, 博士后, 主要从事光纤电流传感技术、宽带大电流计量技术方面的研究。

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引用该论文

Li Chuansheng,Zhao Wei,Wang Jiafu,Shao Haiming. Harmonic Measurement Error Mechanism and Performance Improvement of Direct-Current Fiber-Optic Current Transformer[J]. Chinese Journal of Lasers, 2017, 44(9): 0910002

李传生,赵伟,王家福,邵海明. 直流光纤电流互感器谐波测量误差机理及改善[J]. 中国激光, 2017, 44(9): 0910002

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