Optimizing Battery Energy Storage Integration with Fast EV Chargers for Grid Ancillary Services: A Case Study in East-Denmark

As the world transitions towards variable renewable energy sources such as wind and solar, the demand for flexibility in the power system is increasing. Additionally, the electrification of transportation is driving up electricity demand. To address these challenges, electricity storage has emerged as a crucial solution. This study focuses on integrating battery electricity storage systems (BESS) in fast electric vehicle charging stations (EVCS) to provide ancillary services to the grid. The objective is to develop day-ahead bidding and scheduling algorithms tailored for infrastructure owners considering market and technical requirements specific to frequency regulation services in East-Denmark (DK2). A seasonal auto-regressive integrated moving average (SARIMA) model is also implemented to forecast ancillary service prices. Through a month-long test period, the developed method is compared to the optimal solution using perfect price information. Our findings offer insights into the benefit of multi-market strategies and ancillary service provision for fast EVCS and BESS owners, contributing to the understanding of sustainable energy integration and grid stability.