Design consideration on size of hybrid electric marine vessel's battery energy storage-Ferry Case Study

Abstract

This paper addresses design consideration on Battery Energy Storage System (BESS) sizing of Hybrid Electric Marine Vessel. Different size of BESS is simulated to assess fuel consumption of the vessel, charge/discharge peak power of the BESS, and equivalent life cycle of the BESS used. To determine power contribution between generators and BESS, a Power Management System (PMS) is designed based on load demand and battery remaining energy. In this paper, a ferry's load profile is used as the case study. From simulation results, there is not much reduction of fuel consumption when the BESS size is over 200kWh. However, the benefits of having larger BESS size are smaller required ratio of peak power to rated energy of the BESS and smaller equivalent life cycle used. Furthermore, the minimum BESS size is then determined whether the required ratio of peak power to rated energy can be met by commercially available battery. Different chemistries of lithium-ion based BESS technology are considered in this paper.