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Research on Loss in Power Grid Induced by Three-Phase Imbalance

Received: 30 June 2020     Published: 10 August 2020
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Abstract

The power quality problems in the power grid have some direct impact on the distribution network such as to increase the system's active power loss. There are many single-phase power users in the power distribution network which will inevitably cause the power quality problems such as three-phase imbalance. Three phase imbalance is widespread across the power grid and causes additional loss in the transformer and the transmission line. Therefore, the loss of the low-voltage distribution network is also increased rapidly, so it is of great significance to consider the loss of low-voltage distribution network under the disturbance of such a power quality problem. In this paper, the calculation method of the additional losses of the transmission line and the transformer in three-phase imbalance is derived theoretically. The accuracy of theoretical formula is verified in MATLAB/SIMULINK simulation platform. Secondly, the simulation data of the additional loss generated in the transformer and the transmission line when the three-phase imbalance exists is comprehensively analyzed. Several cases of different unbalanced loads are considered in the paper. The additional value of the power loss relative to the balanced case which is caused by the three phase imbalance is the largest one for the case in which phase A and B have heavy load and phase C is light load and the absolute value of the power loss in this case is also the largest in three cases. The additional loss is not proportional to the total loss both for the transformer and the line. We verify that the additional loss caused by three-phase imbalance is dependent on the unbalanced degree. As the unbalanced degree is increasing, both the absolute value of the additional loss and the increment ratio of loss for the transformer and the line are enhanced simultaneously.

Published in Journal of Electrical and Electronic Engineering (Volume 8, Issue 3)
DOI 10.11648/j.jeee.20200803.14
Page(s) 103-108
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2020. Published by Science Publishing Group

Keywords

Three-Phase Imbalance, Transmission Line, Transformer, MATLAB/SIMULINK Simulation, Additional Loss

References
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[3] Sun Yan, Lin Shenghong, Liu Mingbo. Analysis of optimal power supply capacity of medium voltage distribution network [J]. Southern Power System Technology, 2014, 8 (1): 80-84.
[4] M. Jawad Ghorbani, Hossein Mokhtari. Impact of Harmonics on Power Quality and Losses in Power Distribution Systems [J]. International Journal of Electrical and Computer Engineering, 2015, 7 (1): 166-174.
[5] Congling Li, Peng Wang. Yucheng Li, Research and Application of Unbalanced Three-phase Load Control Scheme for Distribution Network [J]. Editorial Department of Journal of Shangluo University, 2018, 2: 74-78.
[6] Feng Cheng, Xu Changbao. Analysis of influence of three-phase current imbalance and harmonics on power grid loss [J]. Power Quality, 2016, (7): 47-51.
[7] Yanliang Wang, Zhishun Yue, Jinquan Wang, Zhang Qi. Analysis of harmonic additional loss and energy saving for reducing loss [J]. Power electronics, 2009 (2): 15-16.
[8] IEEE. IEEE recommended practice for establishing transformer capability when supplying nonsinusoided load currents. Standard ANSI/IEEE C57. 110-1986.
[9] Zhang An-hong. Research of Loss and Design for Transformer [D]. Changsha: Hunan University, 2005.
[10] Mabel Ebenezer, Rajkumar Mattacaud Ramachandralal, Chandramohanan Nair Padmanabha Pillai Sarasamma. Study and Analysis of the Effect of Harmonics on the Hot Spot Temperature of a Distribution Transformer Using Finite-Volume Method [J]. Electric Power Components and Systems Electric Power Components and Systems, 2015: 2251-2261.
[11] Yang Xiao-ming. Influence Analysis on 10kV Distribution Transformer's Los s [J]. Hunan Water Conservancy and Electric Power, 2001, (3): 33-34.
[12] Ruan Quan-rong, Wang Liang, Shi Wei. A Kind of Transformer's Nonlinear Model Considering Loss [J]. Transaction of Xi'an Jiaotong University, 2006, 40 (10).
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[15] Wang Yanliang, Yue Zhishun, Wang Jingquan, et al. Analyzing the addition loss of harmonic and how to reducing it for energy saving [J]. Electrical Engineering, 2009, 2 (3): 15-19.
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  • APA Style

    Yunxia Dong. (2020). Research on Loss in Power Grid Induced by Three-Phase Imbalance. Journal of Electrical and Electronic Engineering, 8(3), 103-108. https://doi.org/10.11648/j.jeee.20200803.14

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    ACS Style

    Yunxia Dong. Research on Loss in Power Grid Induced by Three-Phase Imbalance. J. Electr. Electron. Eng. 2020, 8(3), 103-108. doi: 10.11648/j.jeee.20200803.14

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    AMA Style

    Yunxia Dong. Research on Loss in Power Grid Induced by Three-Phase Imbalance. J Electr Electron Eng. 2020;8(3):103-108. doi: 10.11648/j.jeee.20200803.14

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  • @article{10.11648/j.jeee.20200803.14,
      author = {Yunxia Dong},
      title = {Research on Loss in Power Grid Induced by Three-Phase Imbalance},
      journal = {Journal of Electrical and Electronic Engineering},
      volume = {8},
      number = {3},
      pages = {103-108},
      doi = {10.11648/j.jeee.20200803.14},
      url = {https://doi.org/10.11648/j.jeee.20200803.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20200803.14},
      abstract = {The power quality problems in the power grid have some direct impact on the distribution network such as to increase the system's active power loss. There are many single-phase power users in the power distribution network which will inevitably cause the power quality problems such as three-phase imbalance. Three phase imbalance is widespread across the power grid and causes additional loss in the transformer and the transmission line. Therefore, the loss of the low-voltage distribution network is also increased rapidly, so it is of great significance to consider the loss of low-voltage distribution network under the disturbance of such a power quality problem. In this paper, the calculation method of the additional losses of the transmission line and the transformer in three-phase imbalance is derived theoretically. The accuracy of theoretical formula is verified in MATLAB/SIMULINK simulation platform. Secondly, the simulation data of the additional loss generated in the transformer and the transmission line when the three-phase imbalance exists is comprehensively analyzed. Several cases of different unbalanced loads are considered in the paper. The additional value of the power loss relative to the balanced case which is caused by the three phase imbalance is the largest one for the case in which phase A and B have heavy load and phase C is light load and the absolute value of the power loss in this case is also the largest in three cases. The additional loss is not proportional to the total loss both for the transformer and the line. We verify that the additional loss caused by three-phase imbalance is dependent on the unbalanced degree. As the unbalanced degree is increasing, both the absolute value of the additional loss and the increment ratio of loss for the transformer and the line are enhanced simultaneously.},
     year = {2020}
    }
    

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  • TY  - JOUR
    T1  - Research on Loss in Power Grid Induced by Three-Phase Imbalance
    AU  - Yunxia Dong
    Y1  - 2020/08/10
    PY  - 2020
    N1  - https://doi.org/10.11648/j.jeee.20200803.14
    DO  - 10.11648/j.jeee.20200803.14
    T2  - Journal of Electrical and Electronic Engineering
    JF  - Journal of Electrical and Electronic Engineering
    JO  - Journal of Electrical and Electronic Engineering
    SP  - 103
    EP  - 108
    PB  - Science Publishing Group
    SN  - 2329-1605
    UR  - https://doi.org/10.11648/j.jeee.20200803.14
    AB  - The power quality problems in the power grid have some direct impact on the distribution network such as to increase the system's active power loss. There are many single-phase power users in the power distribution network which will inevitably cause the power quality problems such as three-phase imbalance. Three phase imbalance is widespread across the power grid and causes additional loss in the transformer and the transmission line. Therefore, the loss of the low-voltage distribution network is also increased rapidly, so it is of great significance to consider the loss of low-voltage distribution network under the disturbance of such a power quality problem. In this paper, the calculation method of the additional losses of the transmission line and the transformer in three-phase imbalance is derived theoretically. The accuracy of theoretical formula is verified in MATLAB/SIMULINK simulation platform. Secondly, the simulation data of the additional loss generated in the transformer and the transmission line when the three-phase imbalance exists is comprehensively analyzed. Several cases of different unbalanced loads are considered in the paper. The additional value of the power loss relative to the balanced case which is caused by the three phase imbalance is the largest one for the case in which phase A and B have heavy load and phase C is light load and the absolute value of the power loss in this case is also the largest in three cases. The additional loss is not proportional to the total loss both for the transformer and the line. We verify that the additional loss caused by three-phase imbalance is dependent on the unbalanced degree. As the unbalanced degree is increasing, both the absolute value of the additional loss and the increment ratio of loss for the transformer and the line are enhanced simultaneously.
    VL  - 8
    IS  - 3
    ER  - 

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Author Information
  • School of Electrical and Electronic Engineering, North China Electrical Power University, Beijing, China

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