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 ORCID: https://orcid.org/0000-0001-7928-3602 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:	03 Nov 2022 09:46
URI:	https://orca.cardiff.ac.uk/id/eprint/105943

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