A Method Based on Combination Operation of Detecting Harmonic in Unbalanced Power System
Science Journal of Energy Engineering
Volume 4, Issue 3, June 2016, Pages: 23-29
Received: Aug. 17, 2016; Accepted: Aug. 26, 2016; Published: Sep. 13, 2016
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Junli Wan, College of Electrical Engineering & New Energy, China Three Gorges University, Yi Chang, China
Hao Liu, College of Electrical Engineering & New Energy, China Three Gorges University, Yi Chang, China
Linjuan Wu, College of Electrical Engineering & New Energy, China Three Gorges University, Yi Chang, China
Shirun Cheng, College of Electrical Engineering & New Energy, China Three Gorges University, Yi Chang, China
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Aiming at defects of traditional harmonic detection in three-phase unbalanced condition, an improved ip-iq detecting method is proposed based on instantaneous reactive power theory. When power grid voltage unbalanced or voltage distortion, through coordinate transformation, trigonometric transforming and combination operation of the three-phase voltage, the fundamental positive sequence voltage is extracted, and the average filter string into the low pass filter (LPF) to reduce the ripples in fundamental positive sequence current. The improved method is more accurate and quick than traditional ip-iq detecting method when extracting positive sequence fundamental voltage, detecting the negative sequence current of power grid and harmonic reactive current, significantly to reduce THD of fundamental positive sequence current and the detection error caused by unbalance and distortion voltage. Simulative results verify the correctness and validity of theoretical analysis.
Instantaneous Reactive Power, Unbalanced Power Grid, Fundamental, Positive Sequence Voltage Extracting, Average Filter, Harmonic Detection
To cite this article
Junli Wan, Hao Liu, Linjuan Wu, Shirun Cheng, A Method Based on Combination Operation of Detecting Harmonic in Unbalanced Power System, Science Journal of Energy Engineering. Vol. 4, No. 3, 2016, pp. 23-29. doi: 10.11648/j.sjee.20160403.11
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This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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