Under the goal of“dual carbon”

the high penetration of renewable energy generation brings about critical challenges such as integration difficulties and strong power fluctuations

which urgently require solutions. Electrolyzer loads with adjustable capacity can achieve bidirectional matching with renewable energy output. Meanwhile

off-grid hydrogen production yields green hydrogen with zero carbon emissions throughout its life

serving as a key driver for achieving the“dual carbon”strategy. Therefore

an optimal capacity configuration method for an off-grid wind-solar-storage hydrogen production system considering hybrid electrolyzers is proposed. First

modeling and analysis are conducted for key components on the power supply side and hydrogen production side of the system. Second

with the objective of minimizing hydrogen production costs

an optimization model for the off-grid wind-solar-storage hydrogen production system is constructed. Finally

a case study is performed based on wind and PV output data from a region in Northwest China. Simulation results demonstrate that the coordinated operation strategy of hybrid electrolyzers

compared to a single electrolyzer

can reduce hydrogen production costs

decrease the start-stop cycles of electrolyzers

and mitigate renewable energy curtailment

thereby verifying the feasibility and effectiveness of the proposed model and method.