Capacity Optimization of Wind-Storage Combined Power Generation System in Cold Region Based on Gravity Energy Storage

How to plan the capacity of wind farm and gravity energy storage reasonably is the premise to ensure the reliability and economy of wind-storage combined power generation system in cold areas. This paper presents a capacity optimization model of grid connected wind-storage combined power generation system with the minimum total cost as the objective function, taking into account both vertical and slope forms of gravity energy storage. Takes the evaluation indexes such as wind-load complementarity, power loss rate and contribution rate of wind-storage combined power generation system as constraints, uses the genetic algorithm with education strategy to solve the problem. Takes a high latitude cold region in China as an example, comparisons the optimization results of different energy storage forms such as gravity energy storage, battery energy storage and compressed air, proves the superiority of gravity energy storage in high latitude cold region from a long-term perspective.