Dispatchable capacity optimization strategy for battery swapping and charging station aggregators to participate in grid operations

• Published in: Energy reports 2023-11, Vol.10, p.734-743
• Main Authors: Zhang, Mingze, Yu, Samson S., Yu, Hanlin, Li, Ping, Li, Weidong, Muyeen, S.M.
• Format: Article
• Language: English
• Subjects: Battery swapping and charging station; Dispatchable capacity; Electric vehicle battery; Flexible demand-side resource; Load-side aggregator
• ISSN: 2352-4847; 2352-4847
• DOI: 10.1016/j.egyr.2023.07.022

Taking the aggregator as a unit, battery swapping and charging stations (BSCSs) for electric vehicles (EVs) can be aggregated and dispatched by grid operators, to realize the demand-side resource regulation. Considering the characteristics of an aggregator’s multilateral services, in this study, BSCSs need to ensure the quality of swapping service for EV users and participate in the demand-side regulation response. Firstly, we analyze the operation mechanism of a BSCS in the aggregation mode and propose a state transition model for EV batteries. On this basis, the EV demand uncertainty is incorporated by a distributed robust optimization (DRO) approach for multi-timescale inventories, and an optimization model to maximize the BSCSs’ income is established, which obtains the optimal load planning and dispatchable capacity scheduling for a BSCS aggregator. Extensive simulations and numerical results show that the BSCS aggregator with demand-side regulation capacity can increase its income by 59.05% and 36.78% on working and non-working days, respectively. Also, the aggregator does not worsen the original power load while meeting the EV swapping demand and can decrease the daily load fluctuations by 0.65% and 12.89%, reduce the peak–valley difference by 5.81% and 7.80%, and increase the load rate by 3.67% and 4.08% in working and non-working day situations through providing the dynamic dispatchable capacity for the grid. [Display omitted] •A novel operation mechanism is proposed for RBESS-BSCSs in the aggregation mode.•An optimization model is built to obtain dispatchable capacity of BSCS aggregators.•DRO method for multi-timescale inventories is used for EV demand uncertainties.•Maximum BSCSs income is achieved for swapping service and dispatchable capacity.•Grid load characteristic indexes are improved with the aggregated BSCSs operations.