To achieve efficient integration of renewable energy and economically viable supply of green hydrogen

this paper conducts an optimal configuration study on a weakly grid-connected "wind-solar-storage-hydrogen" system.Based on an analysis of the technical characteristics of various technologies

including wind power generation

photovoltaic power generation

electrochemical energy storage

water electrolysis for hydrogen production

and hydrogen storage

and taking into account the hydrogen supply load characteristic requirements of downstream chemical plants such as those producing sy nthetic ammonia

methanol

and aviation fuel

a systematic mathematical model is developed.This model defines the bidirectional power and hydrogen balance constraints

equipment operational constraints

and capacity constraints within the system

and establishes an optimization function aimed at minimizing the total system investment cost.The study proposes a system matching principle of "priority to wind and solar

hydrogen production as the mainstay

energy storage for regulation

and hydrogen as a buffer

" providing a theoretical basis and optimization method for the capacity planning and operation strategies of wind-solar-storage-hydrogen systems in green hydrogen-to-ammonia

-methanol

and-oil projects.This research offers guidance for promoting the large-scale

weakly grid-connected application of renewable-energy-based hydrogen production.