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Energies 2017, 10(2), 171; doi:10.3390/en10020171

Contribution Determination for Multiple Unbalanced Sources at the Point of Common Coupling

Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education, Shandong University, Jinan 250061, China
The School of Electrical Engineering, Shandong University, Jinan 250061, China
School of Electrical Engineering, Southeast University, Nanjing 210096, China
Author to whom correspondence should be addressed.
Academic Editor: Ying-Yi Hong
Received: 8 December 2016 / Revised: 20 January 2017 / Accepted: 20 January 2017 / Published: 4 February 2017
(This article belongs to the Special Issue Electric Power Systems Research 2017)
View Full-Text   |   Download PDF [1971 KB, uploaded 4 February 2017]   |  


Three-phase unbalance is an important power quality issue that can cause many negative effects to the power system. Effective mitigation and management of voltage unbalance will benefit from the knowledge of how the unbalanced sources contribute to the voltage asymmetry at the point of evaluation (POE). In this paper, a method is proposed to assess the overall unbalance contribution of the multiple unbalanced sources at the point of common coupling (PCC). Firstly, the equivalent circuit for analysis is established and the unbalance contribution indices are proposed. Then a method is proposed to determine whether the dominant unbalanced polluter is at the upstream or downstream of POE. If the main unbalanced source is identified to be downstream of POE, a procedure is further proposed to determine the individual contribution of the multiple unbalanced sources. Moreover, for the multiple unbalanced source condition, the current flowing in each feeder is proposed to be used for the contribution estimation instead of the current actually emitted by the unbalanced source. Finally, a method is proposed to estimate the equivalent negative sequence impedance of the aggregate loads. Simulation and field analysis results validate the effectiveness and accuracy of the method. View Full-Text
Keywords: power quality; unbalance contribution; multiple unbalanced sources; point of evaluation power quality; unbalance contribution; multiple unbalanced sources; point of evaluation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sun, Y.; Li, P.; Li, S.; Zhang, L. Contribution Determination for Multiple Unbalanced Sources at the Point of Common Coupling. Energies 2017, 10, 171.

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