A Fully Decentralized Optimal Dispatch Scheme for an AC–DC Hybrid Distribution Network Formed by Flexible Interconnected Distribution Station Areas

Xu Tang, Jingwen Zheng, Zhichun Yang, Xiangling He, Huaidong Min, Sihan Zhou, Kaipei Liu and Liang Qin ()
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Xu Tang: Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy, Wuhan 430072, China
Jingwen Zheng: Electric Power Research Institute, State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Zhichun Yang: Electric Power Research Institute, State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Xiangling He: Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy, Wuhan 430072, China
Huaidong Min: Electric Power Research Institute, State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Sihan Zhou: Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy, Wuhan 430072, China
Kaipei Liu: Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy, Wuhan 430072, China
Liang Qin: Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy, Wuhan 430072, China

Sustainability, 2023, vol. 15, issue 14, 1-21

Abstract: Due to unbalanced load growth among different regions and the increasing integration of distributed generators (DGs), distribution station areas (DSAs) currently face issues such as voltage violations, curtailment of renewable energy generation, and imbalanced load rates among DSAs. Interconnecting DSAs to form an AC–DC hybrid distribution network (DN) can not only address the aforementioned problems but also provides more efficient interfaces for DC devices. In order to coordinate the controllable devices within the flexible interconnected DSAs and achieve an optimal operational state, centralized optimal dispatch strategies are mainly used, which requires the deployment of an additional central controller and entails heavy communication and computation burdens. To overcome the drawbacks of centralized dispatch, a fully decentralized optimal dispatch scheme based on the alternating direction method of multipliers (ADMM) is proposed. Based on the network partitioning results, the introduction of auxiliary variables that replicate the coupling variables between areas further eliminates the need for a coordinating center in the standard ADMM, achieving a fully decentralized optimal dispatch. Additionally, two network partitioning methods are proposed for implementing decentralized dispatch. Both partitioning methods can achieve the goals of load rate balance and voltage profile improvement when implementing decentralized dispatch. Their key distinction lies in their effectiveness in improving the voltage profiles on the DC side. The partitioning method that treats the entire DC side as a separate area, resulting in higher investment, achieves better results in improving the DC voltage profiles than the other one. The choice of partitioning method can be based on practical engineering requirements.

Keywords: AC–DC hybrid distribution network; alternating direction method of multipliers (ADMM); decentralized control; distribution station area (DSA); flexible interconnection; load rate imbalance; voltage control (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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