In order to reduce the fluctuation of renewable energy power generation output and improve the utilization rate of renewable energy

this paper designs an on/off grid wind solar hybrid hydrogen synthesis ammonia system. Taking the maximum annual revenue of the system as the objective function

considering the operation constraints such as power balance

hydrogen balance and grid interaction

a capacity allocation scheduling optimization model is established. Taking the real output of the wind and solar energy in a certain area of Inner Mongolia as the input

through the analysis on wind and solar energy capacity ratio

this paper explores the technical and economic effect of the wind and solar energy capacity ratio on the system. The results show that

after the capacity configuration and scheduling optimization of the on/off grid wind solar complementary hydrogen and ammonia system

the system can reasonably switch the working state under different wind and solar output conditions

stabilize the wind and solar fluctuations

and realize the stable and efficient operation of ammonia equipment. The grid connected system is better than the off grid system. Through the analysis of the ratio of wind and solar capacity

in the case area

with the increase of wind capacity

the capacity of electrolyzer and hydrogen storage tank to be configured in the system shows a trend of first decreasing and then increasing.When the capacity of wind power generation and photovoltaic power generation is close to or equal

the economic efficiency of the system is high.