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Optimal operation of soft open points in active distribution networks under three-phase unbalanced conditions

Li, Peng, Ji, Haoran, Wang, Chengshan, Zhao, Jinli, Song, Guanyu, Ding, Fei and Wu, Jianzhong 2019. Optimal operation of soft open points in active distribution networks under three-phase unbalanced conditions. IEEE Transactions on Smart Grid 10 (1) , pp. 380-391. 10.1109/TSG.2017.2739999

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Abstract

The asymmetric integration of distributed generators (DGs) exacerbates the three-phase unbalanced condition in distribution systems. The serious unbalanced operation causes inefficient utilization of network assets and security risks in the system. Soft open point (SOP) is a flexible power electronic device which can achieve accurate active and reactive power flow control to balance the power flow among phases. This paper proposes an SOPs-based operation strategy for unbalanced active distribution networks. By regulating the operation of SOPs, the strategy can reduce power losses and simultaneously mitigate the three-phase unbalance of the upper-level grid. Semidefinite programming (SDP) relaxation is advocated to convert the original non-convex, nonlinear optimization model into an SDP formulation, which can be efficiently solved to meet the requirement of rapid adjustment. Case studies are conducted on the modified IEEE 33-node and IEEE 123-node distribution system to verify the effectiveness and efficiency of the proposed strategy.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: Institute of Electrical and Electronics Engineers
ISSN: 1949-3053
Date of Acceptance: 9 August 2017
Last Modified: 24 Apr 2019 10:25
URI: http://orca.cf.ac.uk/id/eprint/105943

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