Capacity Optimization and Economic Analysis of Off-grid Wind-solar Hydrogen Storage System

To enhance the economic efficiency and operational stability of off-grid wind-solar hydrogen production systems, a novel capacity configuration method is proposed. This method optimizes system equipment capacity in an integrated wind-solar-hydrogen system with the objective of maximizing system revenue. A case study is conducted using data from a wind-solar hydrogen production project in a specific region, where three schemeswind energy, hydrogen production, wind-battery hydrogen production, and wind-solar-battery hydrogen production-are designed and compared. The analysis reveals that, under the given wind and solar conditions, the system achieves maximum benefit when the wind power to photovoltaic installation ratio is 2.75:1. Additionally, energy storage effectively mitigates fluctuations in new energy output. The study also examines the cost composition of the wind-solar hydrogen storage system and the impact of equipment costs on the unit hydrogen production cost. The findings show that the cost of wind turbine equipment significantly influences the unit hydrogen production cost. A 50% reduction in wind turbine costs corresponds to a $4.9 \mathrm{CNY} / \mathrm{kg}$ increase in hydrogen price.