The integration of high shares of variable renewable energy raises challenges for the reliability and cost-effectiveness of power systems. The value of long-duration energy storage, which helps address variability in renewable energy supply across days and seasons, is poised to grow significantly as power systems shift to larger shares of variable generation such as wind and solar. This study explores the system-level services and associated benefits of long-duration energy storage on the 2050 Western Interconnection (WI). The operation of the future WI system with 85% renewable penetration is simulated using a two-stage production cost model. The impact of long duration energy storage on systemwide operations is examined for the 2050 WI system, using a range of round-trip efficiencies corresponding to four different energy storage technologies. The analysis projects the energy storage dispatch profile, system-wide production cost savings (from both diurnal and seasonal operation), and impacts on generation mix, and change in renewable generation curtailment.

高份额的可变可再生能源的集成给电力系统的可靠性和成本效益提出了挑战。随着电力系统转向风能和太阳能等更大比例的可变容量发电，长期储能的价值有望显着增长，这有助于解决可再生能源在不同天数和不同季节的变化。这项研究探索了2050 Western Interconnection（WI）上的系统级服务以及长期储能的相关好处。使用两阶段生产成本模型模拟了具有85％可再生渗透率的未来WI系统的运行。使用与四种不同能量存储技术相对应的一系列往返效率，研究了2050 WI系统的长期能量存储对全系统运行的影响。