The power quality problems are more and more serious in the power system. The harmonics and the three-phase imbalance have a greater impact on the line loss of power grid. We focus on the power losses in cables and transformers with unbalanced load in current harmonics basing on the equivalent resistance method. The impact caused by the skin effect is illustrated in order to enhance the accuracy of the theoretical calculation. For this purpose, a mathematical development that takes in account the presence of current harmonic components and unbalanced load in the losses calculation is presented. The reliability of the method is verified in a simulation model. According to the comparative analysis between the simulation and the proposed method, we can conclude that the harmonic resistance calculation method considering skin effect is more accurate than the traditional method. The results show that the additional loss caused by the harmonics has a nonlinear relation with the harmonic currents. At the same time, the additional loss of distribution network under compound disturbance with unbalanced load in current harmonics is studied. Compared with the cases that two phase load are heavy and one phase load is light or one phase load is heavy and other two phase load are light, when one phase load is heavy, one phase load is light and one phase load is the average value of the others, the additional loss of the system is the least one. The additional loss for the case with that two phase load are heavy and one phase load is light is the biggest one.
| Published in | Journal of Electrical and Electronic Engineering (Volume 9, Issue 3) |
| DOI | 10.11648/j.jeee.20210903.13 |
| Page(s) | 78-86 |
| 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), 2021. Published by Science Publishing Group |
Power Losses, Skin Effect, Harmonics, Unbalanced Load
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APA Style
Yunxia Dong, Yuefeng Shi. (2021). Analysis of Losses in Cables and Transformers with Unbalanced Load and Current Harmonics. Journal of Electrical and Electronic Engineering, 9(3), 78-86. https://doi.org/10.11648/j.jeee.20210903.13
ACS Style
Yunxia Dong; Yuefeng Shi. Analysis of Losses in Cables and Transformers with Unbalanced Load and Current Harmonics. J. Electr. Electron. Eng. 2021, 9(3), 78-86. doi: 10.11648/j.jeee.20210903.13
AMA Style
Yunxia Dong, Yuefeng Shi. Analysis of Losses in Cables and Transformers with Unbalanced Load and Current Harmonics. J Electr Electron Eng. 2021;9(3):78-86. doi: 10.11648/j.jeee.20210903.13
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Download@article{10.11648/j.jeee.20210903.13,
author = {Yunxia Dong and Yuefeng Shi},
title = {Analysis of Losses in Cables and Transformers with Unbalanced Load and Current Harmonics},
journal = {Journal of Electrical and Electronic Engineering},
volume = {9},
number = {3},
pages = {78-86},
doi = {10.11648/j.jeee.20210903.13},
url = {https://doi.org/10.11648/j.jeee.20210903.13},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20210903.13},
abstract = {The power quality problems are more and more serious in the power system. The harmonics and the three-phase imbalance have a greater impact on the line loss of power grid. We focus on the power losses in cables and transformers with unbalanced load in current harmonics basing on the equivalent resistance method. The impact caused by the skin effect is illustrated in order to enhance the accuracy of the theoretical calculation. For this purpose, a mathematical development that takes in account the presence of current harmonic components and unbalanced load in the losses calculation is presented. The reliability of the method is verified in a simulation model. According to the comparative analysis between the simulation and the proposed method, we can conclude that the harmonic resistance calculation method considering skin effect is more accurate than the traditional method. The results show that the additional loss caused by the harmonics has a nonlinear relation with the harmonic currents. At the same time, the additional loss of distribution network under compound disturbance with unbalanced load in current harmonics is studied. Compared with the cases that two phase load are heavy and one phase load is light or one phase load is heavy and other two phase load are light, when one phase load is heavy, one phase load is light and one phase load is the average value of the others, the additional loss of the system is the least one. The additional loss for the case with that two phase load are heavy and one phase load is light is the biggest one.},
year = {2021}
}
TY - JOUR T1 - Analysis of Losses in Cables and Transformers with Unbalanced Load and Current Harmonics AU - Yunxia Dong AU - Yuefeng Shi Y1 - 2021/06/04 PY - 2021 N1 - https://doi.org/10.11648/j.jeee.20210903.13 DO - 10.11648/j.jeee.20210903.13 T2 - Journal of Electrical and Electronic Engineering JF - Journal of Electrical and Electronic Engineering JO - Journal of Electrical and Electronic Engineering SP - 78 EP - 86 PB - Science Publishing Group SN - 2329-1605 UR - https://doi.org/10.11648/j.jeee.20210903.13 AB - The power quality problems are more and more serious in the power system. The harmonics and the three-phase imbalance have a greater impact on the line loss of power grid. We focus on the power losses in cables and transformers with unbalanced load in current harmonics basing on the equivalent resistance method. The impact caused by the skin effect is illustrated in order to enhance the accuracy of the theoretical calculation. For this purpose, a mathematical development that takes in account the presence of current harmonic components and unbalanced load in the losses calculation is presented. The reliability of the method is verified in a simulation model. According to the comparative analysis between the simulation and the proposed method, we can conclude that the harmonic resistance calculation method considering skin effect is more accurate than the traditional method. The results show that the additional loss caused by the harmonics has a nonlinear relation with the harmonic currents. At the same time, the additional loss of distribution network under compound disturbance with unbalanced load in current harmonics is studied. Compared with the cases that two phase load are heavy and one phase load is light or one phase load is heavy and other two phase load are light, when one phase load is heavy, one phase load is light and one phase load is the average value of the others, the additional loss of the system is the least one. The additional loss for the case with that two phase load are heavy and one phase load is light is the biggest one. VL - 9 IS - 3 ER -
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