Modelling and Start-up Coordinated Control Strategy for an Off-grid Photovoltaic/Hydrogen/Battery Hybrid System

In this paper, a start-up coordinated control strategy of an off-grid Photovoltaic/Hydrogen/Battery Hybrid System is presented. The hybrid system is applied to produce off-grid power for a proton exchange membrane electrolyzer (PEMEL) and customer’s load. The main energy source of the hybrid system is photovoltaic (PV), and energy storage is required to ensure that the PEMEL works at a good point of power, either the battery energy storage system (BESS) or the hydrogen energy storage system (HESS). These tasks need to be judged during the start-up process of the system and carried out by the energy management system. In this study, the system model is established based on the mathematical relationship of various devices in the hybrid system, and a start-up coordinated control strategy considering the optimal hydrogen production power of the system is proposed. The proposed method is verified in the simulation environment and reaches a good start-up effect and hydrogen production power.