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

Yuanyuan Sun, Peixin Li, Shurong Li and Linghan Zhang
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Yuanyuan Sun: Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education, Shandong University, Jinan 250061, China
Peixin Li: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Shurong Li: The School of Electrical Engineering, Shandong University, Jinan 250061, China
Linghan Zhang: The School of Electrical Engineering, Shandong University, Jinan 250061, China

Energies, 2017, vol. 10, issue 2, 1-17

Abstract: 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.

Keywords: power quality; unbalance contribution; multiple unbalanced sources; point of evaluation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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