(489f) Elucidating the Capabilities and Limitations of Long-Duration Energy Storage Modeling Approaches

The deployment of energy storage technologies, including short-duration, long-duration, and seasonal storage, could facilitate the integration of large shares of variable renewable energy such as wind and solar photovoltaics (PV) in power systems. However, despite recent advances on the techno-economic modeling of energy storage (particularly for short-duration applications), the operation and economics of long-duration storage still lack complete and accurate representation in many modeling platforms. For instance, existing modeling approaches for long-duration are often based either on an oversimplified representation of power system operations or limited representation of storage technologies (evaluation of a single application or assuming coupling of charging and discharging power capacities). This study presents an overview of the challenges of modeling long-duration energy storage technologies as well as a discussion regarding the capabilities and limitations of existing approaches. We will also examine various modeling methodologies to assess the value and dispatch of long-duration storage in two test systems to further elucidate the differences between the modeling methodologies and assess scalability. Moreover, we discuss future research directions towards more comprehensive modeling of long-duration energy storage in view of high renewable power systems.