Design and operational optimization of a methanol-integrated wind-solar power generation system

摘要

Wind and solar energy are rapidly being merged into electricity grids in China. High penetration of variable renewable electricity drives the development of energy storage with low cost, high flexibility and utility-scale. To this end, a methanol-based energy storage system is proposed to meet regional power demand by combining a hybrid wind-solar source. This work studies capacity configuration and logistics scheduling at the hourly level with the minimum power generation cost. The round-trip efficiency reaches 41.5%, and the levelized cost of electricity is 0.148 $/kWh. The wind-solar hybrid system improves the system efficiency and economy compared with separated wind or solar systems. Taking methanol as the hydrogen carrier significantly reduces the storage scale of hydrogen. In terms of regions with larger fluctuation of renewable energy, methanol-based energy storage is more cost-effective than hydrogen energy storage.

关键词