ESS Capacity Calculation Method in Hydrogen Linked System

Hydrogen fuel, which is frequently used among new and renewable energy sources, requires preheating time when converting it into electric power through combustion. Therefore, a system using hydrogen fuel as reserve power needs resources to fill the surplus or insufficient power in the system during this preheating time. As a device to assist with these charging and discharging, an ESS installed inside an electric vehicle charging station is recommended. At this time, it is important to properly select the capacity of the ESS, and this paper will introduce the methodology for estimating the capacity of the ESS that will assist hydrogen facilities in an independent system. First, the minimum capacity value that can guarantee short-term stability is found by calculating the surplus power in the system, and then the capacity that guarantees long-term stability will be formulated using the Monte Carlo technique.