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通过从极低频磁力仪获得的PLHR分析进行电网频率测量。

Grid Frequency Measurement through a PLHR Analysis Obtained from an ELF Magnetometer.

作者信息

Portillo Francisco, Alcayde Alfredo, García Rosa M, Novas Nuria, Gázquez José Antonio, Férnadez-Ros Manuel

机构信息

Department of Engineering, University of Almeria, ceiA3, 04120 Almeria, Spain.

出版信息

Sensors (Basel). 2022 Apr 12;22(8):2954. doi: 10.3390/s22082954.

DOI:10.3390/s22082954
PMID:35458936
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9028975/
Abstract

The stability of the power grid's frequency is crucial for industrial, commercial, and domestic applications. The standard frequency in Europe's grid is 50 Hz and it must be as stable as possible; therefore, reliable measurement is essential to ensure that the frequency is within the limits defined in the standard EN 50160:2010. In this article, a method has been introduced for the measurement of the grid frequency through a power line harmonics radiation analysis. An extremely low-frequency magnetometer was developed with the specific purpose of monitoring, in real time, the electromagnetic field produced by electrical installations in the range from 0 to 2.2 kHz. Zero-crossing and Fast Fourier transform algorithms were applied to the output signal to calculate the grid frequency as a non-invasive method. As a final step, data for a complete month (May 2021) were compared with a commercial power quality analyzer connected to the main line to validate the results. The zero-crossing algorithm gave the best result on 3 May 2021, with a coefficient of determination (R) of 0.9801. Therefore, the indirect measurement of the grid frequency obtained through this analysis satisfactorily fits the grid frequency.

摘要

电网频率的稳定性对于工业、商业和家庭应用至关重要。欧洲电网的标准频率为50Hz，且必须尽可能稳定；因此，可靠的测量对于确保频率在标准EN 50160:2010规定的范围内至关重要。本文介绍了一种通过电力线谐波辐射分析来测量电网频率的方法。开发了一种极低频磁力计，专门用于实时监测电气装置在0至2.2kHz范围内产生的电磁场。将过零算法和快速傅里叶变换算法应用于输出信号，以作为一种非侵入性方法来计算电网频率。作为最后一步，将完整一个月（2021年5月）的数据与连接到主线的商用电能质量分析仪进行比较，以验证结果。过零算法在2021年5月3日给出了最佳结果，决定系数（R）为0.9801。因此，通过该分析获得的电网频率间接测量结果与电网频率拟合良好。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9586/9028975/c8dba3a9dc33/sensors-22-02954-g012.jpg
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