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Front. Inform. Technol. Electron. Eng.  2011, Vol. 12 Issue (4): 330-337    DOI: 10.1631/jzus.C1000145
    
High-precision time domain reactive power measurement in the presence of interharmonics
Bei Zhang*,1, Guo Wei2, Jin-wei Sun2
1 Department of Electrical and Computer Engineering, Auburn University, Auburn 36830, USA 2 School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
High-precision time domain reactive power measurement in the presence of interharmonics
Bei Zhang*,1, Guo Wei2, Jin-wei Sun2
1 Department of Electrical and Computer Engineering, Auburn University, Auburn 36830, USA 2 School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
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摘要： 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.
关键词： Cosine window;  Interharmonics;  Reactive power;  Synchronization error;  Windowed discrete Hilbert transform    
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.
Key words: Cosine window    Interharmonics    Reactive power    Synchronization error    Windowed discrete Hilbert transform
收稿日期: 2010-05-12 出版日期: 2011-04-11
CLC:  TM933  
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Bei Zhang
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Bei Zhang, Guo Wei, Jin-wei Sun. High-precision time domain reactive power measurement in the presence of interharmonics. Front. Inform. Technol. Electron. Eng., 2011, 12(4): 330-337.

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http://www.zjujournals.com/xueshu/fitee/CN/10.1631/jzus.C1000145    或    http://www.zjujournals.com/xueshu/fitee/CN/Y2011/V12/I4/330

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