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
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.
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.
Copyright © 2016 Authors retain the copyright of this article.
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.
Huang ZC, Su XP, Li J (2015) Asymmetrical three-phase system harmonic detection and compensation method research. Power Electronic Technology 49 (3): 82-84 (in Chinese).
Xue H, Yang RG, (2002) High precision harmonic detection algorithm based on FFT. Proceedings of the CSEE 22 (12): 106-110 (in Chinese).
Li ZC, Ren MW, Zhu DH et al (2011). An adaptive detecting algorithm for harmonic current. Power Electronics 45 (7): 50-51.
Zhou L, Meng Q, Liu Q et al (2009). Detection method based on instantaneous reactive power theory of harmonic and reactive current. High Voltage Technique 30 (2): 385-392 (in Chinese).
Rao Y, Zheng JW (2006) A kind of fundamental wave extraction based on steepest descent algorithm of adaptive filter. Electric Power Automation Equipment 26 (8): 19-22 (in Chinese).
He YJ, Liu JJ, Wang ZA, Zou YP (2010) A digital harmonic detection based on instantaneous reactive power theory. Transactions of China Electrotechnical Society 25 (8): 185-192 (in Chinese).
Zhang XG, Xu D, Li WW (2009) A digital phase locking loop applying to unbalance situation of the grid. Electro technical Application 28 (6): 54-58.
Zhou HL, Wan JR, Li SC et al (2012) Voltage distortion and imbalance state without phase-locked loop UPQC offsets detection method. Electric Power Automation Equipment 32 (5): 50-56 (in Chinese).
Naidu SR, Mascarenhas AW, Fernandes DA (2004). A software phase-locked loop for unbalanced and distorted utility conditions. In: Proceedings of the 2004 IEEE International Conference on Power System Technology, Singapore, Nov 2004, 999-1004.
Zhou P, He YK (2010) Synchronization signal detection of fundamental voltage under harmonic distorted grid voltage conditions. Chinese Journal of Scientific Instrument 31 (1): 78-84. (in Chinese).
Rodriguez P, Pou J, Ergas J et al (2007) Decoupled double synch-ronous reference frame PLL for power converters control. IEEE Trans on Power Electronics 22 (2): 584-592.
Tian GZ, Tu ST, Lin BJ et al (2010) Design of phase locked loop based on double synchronous reference frame under unbalance grid voltage in wind power systems. Electric Drive 40 (7): 53-57.
Zhang XG, Xu DG, Li WW (2009) A kind of applicable to the power grid unbalance fault condition of digital phase-locked loop. Electrotechnical Application 28 (6): 54-58 (in Chinese).
Yuan ZC, Sung Q, Liu WH (2010) Improving the dynamic phase tracking and unbalanced voltage detection performance improvements soft phase locked loop algorithms. Power System Technology 34 (1): 31-35.
Ding XJ, Zhang HJ, Zhang XF (2010) A harmonics-detection method without PLL and based on average theory in three-phase ciruit. Electrical Measurement & Insrumentation 47 (553): 43-47 (in Chinese).
Xu Z (2009) The instantaneous reactive power theory and its application in electric power regulation. China Machine Press, Beijing (in Chinese).
Ma YC (2009) Harmonic detection method based on instantaneous reactive power research. Mechanical and electrical integration technology at home and abroad 1 (3): 50-52 (in Chinese).
Han S, Qiu GY, Peng XJ (2005) Effect of phase difference on Harmonic and Reactive Current Detection Analysis. Electrical Measurement & Instrumentation (4): 1-3 (in Chinese).
Zhou K, Luo A, Xia XY el at (2007) An Improved ip-iq Harmonic Detecting Method and Digital Low Pass Filter Optimized Design. Proceedings of the CSEE 27 (34): 96-101.
Zhang XL, Liu MG, Zhong HZ (2014) p-q harmonic detection algorithm and simulation analysis. Electrical Measurement & Instrumentation 17: 24-28 (in Chinese).
Ye HW (2011) The research of current predictive control of active power filter. Dissertation, University of Xi'an Jiaotong University (in Chinese).
Zhang YQ, Song WL, Gao JX (2010) Advanced low pass filter in the application of variable harmonic source load harmonic detection. Journal of Electric Power 25 (6): 475-479 (in Chinese).
Tang Z, Chen YW, Liao DF el at (2009) Optimized low-pass filter harmonic detection circuit parameters. Shanghai Electric Power Univercity Journal (4): 374-378 (in Chinese).
Hai-ya JIANG, Wen-juan LI, Jian-hua DU (2010) Comparative analysis of three fundamental active power filter extraction methods 29 (1): 97-100 (in Chinese).