低压电流互感器校准回路电流谐波提取与叠加研究

Extraction and superposition research of current harmonics in low-voltage current mutual inductor calibration loop

刘清蝉 ¹李腾斌 ¹钟尧 ¹林聪 ¹常军超 ¹赵振刚²

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作者信息

1. 云南电网有限责任公司计量中心,云南昆明650217
2. 昆明理工大学信息工程与自动化学院,云南昆明650500
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摘要

为解决低压电流互感器在线校准中运行电流反向叠加受谐波干扰严重的问题,提出一种电流信号谐波提取与反向叠加方法来减小电流中的高次谐波.该方法首先采用快速傅里叶变换(FFT)来对电网信号进行分析处理,然后设计高通滤波器滤出电网电流谐波分量,最后进行反向后与电网电流信号叠加降低高次谐波分量.结果表明,仿真信号中高次谐波分量减少了99％,在实际信号中高次谐波分量较小的情况下,谐波分量减少了80％.

Abstract

In order to solve the problem of serious harmonic interference caused by the reverse superposition of operating current in the online calibration of low-voltage current transformers,a harmonic extraction and reverse superposition method of current signals is proposed to reduce high-order harmonics in the current.Firstly,this method uses fast Fourier transform(FFT)to analyze and process the grid signal.Then,a high-pass filter is designed to filter out the harmonic components of the grid current.Finally,reverses the direction and superimposes it with the grid current signal to reduce the high-order harmonic components.The results show that the high-order harmonic components in the simulated signal are reduced by 99％.When the high-order harmonic components in the actual signal are small,the harmonic components are reduced by 80％.

关键词

低压电流互感器/快速傅里叶变换/有限脉冲响应/电流反向叠加

Key words

low-voltage current mutual inductor/fast Fourier transform(FFT)/finite impulse response(FIR)/current reverse superposition

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出版年

2024

传感器与微系统

中国电子科技集团公司第四十九研究所

传感器与微系统

CSTPCD北大核心

影响因子：0.61

ISSN：1000-9787

参考文献量13

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