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Appl. Sci. 2017, 7(10), 1057; doi:10.3390/app7101057

Island Partition of Distribution System with Distributed Generators Considering Protection of Vulnerable Nodes

1
School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
2
Beijing Key Laboratory of Distribution Transformer Energy-Saving Technology, China Electric Power Research Institute, Beijing 100192, China
*
Authors to whom correspondence should be addressed.
Received: 5 September 2017 / Accepted: 12 October 2017 / Published: 16 October 2017
(This article belongs to the Special Issue Distribution Power Systems)
View Full-Text   |   Download PDF [2841 KB, uploaded 17 October 2017]   |  

Abstract

To improve the reliability of power supply in the case of the fault of distribution system with multiple distributed generators (DGs) and reduce the influence of node voltage fluctuation on the stability of distribution system operation in power restoration, this paper proposes an island partition strategy of the distribution system considering the protection of vulnerable nodes. First of all, the electrical coupling coefficient of neighboring nodes is put forward according to distribution system topology and equivalent electrical impedance, and the power-dependence relationship between neighboring nodes is calculated based on the direction and level of the power flow between nodes. Then, the bidirectional transmission of the coupling features of neighboring nodes is realized through the modified PageRank algorithm, thus identifying the vulnerable nodes that have a large influence on the stability of distribution system operation. Next, combining the index of node vulnerability, an island partition model is constructed with the restoration of important loads as the primary goal. In addition, the mutually exclusive firefly algorithm (MEFA) is also proposed to realize the interaction of learning and competition among fireflies, thus enhancing the globally optimal solution search ability of the algorithm proposed. The proposed island partition method is verified with a Pacific Gas and Electric Company (PG and E) 60-node test system. Comparison with other methods demonstrates that the new method is feasible for the distribution system with multiple types of distributed generations and valid to enhance the stability and safety of the grid with a relatively power restoration ratio. View Full-Text
Keywords: distributed generator; distribution system; island partition; vulnerable node; mutually exclusive firefly distributed generator; distribution system; island partition; vulnerable node; mutually exclusive firefly
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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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Xu, G.; Wu, S.; Tan, Y. Island Partition of Distribution System with Distributed Generators Considering Protection of Vulnerable Nodes. Appl. Sci. 2017, 7, 1057.

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