An Innovative Calibration Scheme for Interharmonic Analyzers in Power Systems under Asynchronous Sampling

Qiang Guo, Jing Wu, Haibin Jin and Cheng Peng
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Qiang Guo: Department of Electrical Engineering, Beihang University, Beijing 100191, China
Jing Wu: Department of Electrical Engineering, Beihang University, Beijing 100191, China
Haibin Jin: Department of Metrology, Beijing Orient Institute of Measurement and Test, Beijing 100086, China
Cheng Peng: Department of Metrology, Beijing Orient Institute of Measurement and Test, Beijing 100086, China

Energies, 2018, vol. 12, issue 1, 1-10

Abstract: Power-quality analyzers are commonly used in power systems to estimate waveform distortion, including the parameters of harmonics/interharmonics. In our study, a calibration scheme was developed and verified. This scheme is capable of calibrating the interharmonics specification of power-quality analyzers under asynchronous sampling. In our scheme, the hardware structure is composed of an interharmonic signal source, a wide-frequency resistive voltage divider, a broadband current shunt, and a data acquisition system. A new algorithm, based on discrete Fourier transform and interpolation, is presented. The procedure is implemented by LabVIEW software to process the sampling data and obtain the final interharmonic parameters. The test results of the amplitudes of the interharmonic current and voltage indicate that the calibration accuracy is 3.0‰ (16 Hz–6 kHz) and 6.8‰ (6 kHz–9 kHz) for the voltage signal, and 3.5‰ (16 Hz–6 kHz) and 6.5‰ (6 kHz–9 kHz) for the current signal. This index is higher than that acquired by the recommended methods in the International Electrotechnical Commission (IEC) standard.

Keywords: asynchronous sampling; interharmonic calibration; discrete Fourier transform; IEC standards; interpolation; measurement accuracy; power system (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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