储能可解决新型电力系统中调峰能力不足、频率不稳定、惯性不足等难题，与新能源一道有着广阔的发展前景。除去考虑技术因素外，储能的长远发展还需要考虑经济性因素，明晰其在系统中的各类价值并与其投资成本相比较。为解决过去文献中储能价值定义不清、核算方式粗糙的问题，提出了一种改进的储能替代性价值测算方法。文章创新性地提出了一种储能替代性价值测算框架，借鉴VCG(vickery clark aloves)机制计算储能的引入对全系统综合成本的降低幅度。在测算综合成本时，运用规划-运行两阶段联合优化模型，考虑源网荷储的优化互动，实现更为准确合理的经济性分析。文章基于IEEE 5节点算例演示了所提方法的效果，并发现储能具有替代发输电投资、降低需求侧响应和备用费用等多元价值。
英文摘要:
Energy storages can solve the problems of insufficient peak-shaving ability, unstable frequency and insufficient inertia in novel power system, and have a broad development prospect together with renewables. In addition to technical factors, the long-term development of energy storages also needs to consider the economic factors, clarify various values in multiple system, and compare with their investment costs. In order to solve the problems of unclear definition and rough accounting of energy storage values in previous literatures, this paper proposes an improved measurement method of energy storage alternative values. By referring to the vickery clark aloves (VCG) mechanism, this paper proposes a framework to measure the alternative value of energy storages, and calculate the contribution of energy storages to the system overall cost reduction. When measuring the overall costs, this paper uses the planning-operation two-stage joint optimization model. This model considers the inter-action of generation, network, load and storages, which can realize more accurate and reasonable economic analysis. The effectiveness of the proposed model is demonstrated based on an IEEE 5-bus system. It is found that energy storages have multiple values, such as replacing generation and transmission investments, reducing demand response and reserve costs.