Journal
IEEE TRANSACTIONS ON SMART GRID
Volume 10, Issue 1, Pages 380-391Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSG.2017.2739999
Keywords
Active distribution network; distributed generator (DG); soft open point (SOP); unbalanced operation; semidefinite programming
Categories
Funding
- National Key Technology Research and Development Program of China [2016YFB0900105]
- National Natural Science Foundation of China [51261130473]
- Engineering and Physical Sciences Research Council [EP/K006274/1] Funding Source: researchfish
- EPSRC [EP/K006274/1] Funding Source: UKRI
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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.
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