Distributed AC-DC Optimal Power Dispatch of VSC-Based Energy Routers in Smart Microgrids
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AbstractThis paper presents a novel model of voltage source converter based energy routers in microgrids. The proposed model explicitly describes the circuit laws within the ERs and captures the coupling of control variables among the AC/DC, DC/DC, DC/AC links. By incorporating such a model into the AC-DC optimal power flow formulation, we not only optimize the power flows between the AC and DC sides of ERs, but also strategically schedule the flexible resources. To solve the ERs based AC-DC optimal power flow in a distributed fashion, we propose a hierarchical distributed optimization method that decouples the power grids into a master region and several sub-regions. In the master region, we propose a sequence of strong relaxations to transform the problem into a semidefinite program. We further show that this SDP relaxation is exact. For the sub-regions, we utilize sequential quadratic programming to solve multiple small-scale subproblems with non-convex constraints in parallel. Case studies on the IEEE benchmark system show that fuel costs and power losses are reduced dramatically by utilizing ERs in microgrids. In addition, the proposed distributed algorithm can converge faster than alternating direction method of multipliers (ADMM).
Acceptance Date04/02/2021
All Author(s) ListTong Wu, Changhong Zhao, Ying-Jun Angela Zhang
Journal nameIEEE Transactions on Power Systems
Year2021
Month9
Volume Number36
Issue Number5
PublisherIEEE
Pages4457 - 4470
ISSN0885-8950
eISSN1558-0679
LanguagesEnglish-United States
