Optimal dispatch schedule for a fast EV charging station with account to supplementary battery health degradation

TL;DR

This paper develops an optimized dispatch scheduling model for fast EV charging stations that incorporates battery health degradation, demonstrating that accounting for degradation prolongs battery life without significantly sacrificing revenue.

Contribution

It introduces a novel scheduling approach that integrates battery degradation costs into energy arbitrage, improving battery longevity and operational efficiency.

Findings

Including degradation penalties reduces small charge/discharge cycles.

Battery lifetime is extended while maintaining near-optimal revenue.

Scheduling strategies can balance cost and battery health effectively.

Abstract

This paper investigates the usage of battery storage systems in a fast charging station (FCS) for participation in energy markets and charging electrical vehicles (EVs) simultaneously. In particular, we focus on optimizing the scheduling strategies to reduce the overall operational cost of the system over its lifetime by combining the model of battery degradation and energy arbitrage. We implement the battery degradation as a penalty term within an energy arbitrage model and show that the battery degradation plays an important role in the optimal energy dispatch scheduling of the FCS system. In this case study, with different penalty coefficients for the battery degradation penalty term, it is found that including the penalty of battery usage in the scheduling model will reduce the number of small charging/discharging cycles, thereby prolonging the battery lifetime, while maintaining near optimal revenue from grid services.