S. Kassaee, A. Abu-Heiba, M. Starke, M. Chinthavali, A. Momen
Oak Ridge National Laboratory (ORNL),
Keywords: GLIDES, Energy Storage, Power Characterization, Compressed Air Energy Storage, Pumped Storage Hydropower
Summary:Grid modernization is vital to the nation’s safety, economy, and modern way of life. Grid modernization can reduce the societal cost of power outage by more than 10%, decrease the cost of reserve margins by 33%, and reduce the cost of wind and solar integration by 50%, providing more than $7 billion in annual benefits for the US economy [Grid Modernization Initiative, 2015]. One of the key steps towards grid modernization is to economically increase electric energy storage capacity. Ground-Level Integrated Diverse Energy Storage (GLIDES), invented at Oak Ridge National Laboratory (ORNL), is a simple, low-cost, and efficient energy storage technology. GLIDES stores energy by gas compression using a liquid piston inside pressure vessel and can achieve roundtrip efficiency of 70-82%. The relation between the state of charge of the system and its power output is critical to building the storage system. GLIDES power generation profile depends on the gas pressure in the storage vessel. In this paper we present a physics-based model to characterize the power output of GLIDES during a complete discharge cycle. We also present the validation of the model by experimental measurements.