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Journal of Zhejiang University SCIENCE C 2011 Vol.12 No.4 P.330-337

http://doi.org/10.1631/jzus.C1000145


High-precision time domain reactive power measurement in the presence of interharmonics


Author(s):  Bei Zhang, Guo Wei, Jin-wei Sun

Affiliation(s):  Department of Electrical and Computer Engineering, Auburn University, Auburn 36830, USA, School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Corresponding email(s):   bzz0004@auburn.edu

Key Words:  Cosine window, Interharmonics, Reactive power, Synchronization error, Windowed discrete Hilbert transform


Bei Zhang, Guo Wei, Jin-wei Sun. High-precision time domain reactive power measurement in the presence of interharmonics[J]. Journal of Zhejiang University Science C, 2011, 12(4): 330-337.

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author="Bei Zhang, Guo Wei, Jin-wei Sun",
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pages="330-337",
year="2011",
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doi="10.1631/jzus.C1000145"
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%T High-precision time domain reactive power measurement in the presence of interharmonics
%A Bei Zhang
%A Guo Wei
%A Jin-wei Sun
%J Journal of Zhejiang University SCIENCE C
%V 12
%N 4
%P 330-337
%@ 1869-1951
%D 2011
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.C1000145

TY - JOUR
T1 - High-precision time domain reactive power measurement in the presence of interharmonics
A1 - Bei Zhang
A1 - Guo Wei
A1 - Jin-wei Sun
J0 - Journal of Zhejiang University Science C
VL - 12
IS - 4
SP - 330
EP - 337
%@ 1869-1951
Y1 - 2011
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.C1000145


Abstract: 
When interharmonics exist in power system signals, large errors emerge in traditional time domain reactive power measurement. In this paper, we present a novel time domain integral method with good effect of restraining interharmonics, synchronization error, and white noise, as well as the principle of the selection of the sampling periods when employing this approach. The current signal and phase-shifted voltage signal are reconstructed after the harmonic components of signals are extracted, so that the interharmonics are filtered. The influence of the synchronization error on the measurement is reduced through removing the weight coefficients of the reactive components. In the simulation, we apply several cosine windows to the proposed method and analyze signals containing both harmonics and interharmonics. The results show that, in the presence of interharmonics, synchronization error, and white noise (with a fundamental signal-to-noise ratio of 40 dB) all together, the relative errors are within the magnitude of 10−4, which perfectly satisfies the practical requirement.

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Reference

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