Enhancing stochastic multi-microgrid operational flexibility with mobile energy storage system and power transaction

• Published in: Sustainable cities and society 2021-08, Vol.71, p.102962, Article 102962
• Main Authors: Qu, Z.L., Chen, J.J., Peng, K., Zhao, Y.L., Rong, Z.K., Zhang, M.Y.
• Format: Article
• Language: English
• Subjects: Aumann–Shapley; Flexibility; Mobile energy storage system; Multi-microgrid; Power transaction
• ISSN: 2210-6707; 2210-6715
• DOI: 10.1016/j.scs.2021.102962

With the increased uncertainty and variability of net load induced from high penetrations of renewable energy, independent operation of single microgrid (MG) is facing great operational problems such as high operation cost, low self-consumption of local renewable energy and exacerbating peak and valley load. In this paper, a mobile energy storage system (MESS) and power transaction-based flexibility enhancement strategy is proposed for interconnecting multi-microgrid (MMG) considering uncertain renewable generation. The MESS can move between different microgrids by a truck, and we use this temporal–spatial flexibility to provide charging/discharging service for MMG. Then, the Aumann–Shapley is developed for expenses allocating in MMG system with MESS and power transaction due to ensuring the fairness and reasonableness is of the utmost important in collaborative operation. After that, the expected power not served (EPNS) and expected power curtailment (EPC) are derived as the risk measure to evaluate the uncertain renewable energy from the perspective of risk aversion. Numerical studies show that MESS for MMG operation enables the reduction in total operational cost of diesel generator by 23.58%, the improvement in total grid connection volumes of wind and solar by 7.17%, and the improvement in smoothness of the total load curve by 0.92%. Besides, interconnected system for MMG operation enables the improvement in total grid connection volumes of wind and solar by 6.69%, and the improvement in smoothness of the total load curve by 1.50% in comparison with the unconnected system. •Mobile energy storage system and power transaction-based flexibility enhancement strategy is proposed for multi-microgrid system.•Expected power not served and expected power curtailment-based risk aversion is devised for uncertain wind and solar power.•The value of Aumann–Shapley is used for allocating economic cost of multi-microgrid system.•The effectiveness of the proposed model is verified by evolutionary predator and prey strategy algorithm.