面向低碳电力系统的长期储能优化规划与成本效益分析

Optimal Planning and Cost-benefit Analysis of Long-duration Energy Storage forLow-carbon Electric Power System

长期储能(long-duration energy storage,LDES)技术的不断发展成熟为解决新型电力系统季节性供需不平衡问题提供了有效途径。现有研究对LDES技术经济参数的发展情况和不同组合对LDES配置需求和成本效益的影响尚缺乏精细化分析,难以准确探究LDES的灵活性潜力。为此,该文分析考虑技术经济性的LDES规划特性,面向新型电力系统建立内嵌年度8760h全景时序运行模拟的多时间尺度储能协调优化规划模型。算例基于我国西北某区域实际数据,评估LDES技术经济参数的不同组合与LDES成本效益水平、优化配置结构和对短期储能替代作用的关系。结果表明,LDES的成本效益受储能容量成本和放电效率的影响最大,在低碳转型发展背景下引入LDES最多可以降低电力系统40%左右的总成本。

The continuous development of long-duration energy storage(LDES)technology provides an effective way to solve the seasonal imbalance between supply and demand in novel power systems.Existing research still lacks detailed analysis on the impact of the development of technical and economic parameters of LDES and their different combinations on the deployment demand and cost-effectiveness of LDES,making it difficult to accurately explore the flexibility potential of LDES.Therefore,this paper first analyzes the characteristics of LDES planning considering technical economy,and then establishes a multi-time scale energy storage coordination and optimization planning model embedded in the annual panoramic operation simulation of 8760h in chronologic sequence for novel power systems.Based on the actual data of a certain region in Northwest China,the example evaluates the relationship between different combinations of the technical and economic parameters of the LDES and its cost-effectiveness,optimized deployment structure,and the substitution for short-term energy storage.The results show that the cost-effectiveness of LDES is most affected by energy storage capacity cost and discharge efficiency,and in the development context of low-carbon transition the application of LDES can reduce the total cost of power system by about 40%.