Is underground energy storage system a resilience enhancement method?
As an important support technology of renewables, energy storage system is of great significance in improving the resilience of the power system. In this paper, a resilience enhancement method for power systems with high penetration of renewable energy based on underground energy storage systems (UESS) is proposed.
Why do energy storage systems need underground space?
First, underground space can provide a stable and ample operation space for the energy storage system, protecting the devices from the impacts of extreme weather like rainstorms, typhoons, and blizzards (Zhang et al., ).
What are the benefits of underground energy storage?
These systems provide numerous benefits, including increased utilization of renewable energy, enhanced grid stability and reliability, ensured energy security, balanced supply and demand, and reduced carbon emissions and environmental impact [9, 10]. Fig. 1. Comparison of surface and underground energy storage.
Why is the underground a good place to store thermal energy?
The underground is suitable for thermal energy storage because it has high thermal inertia, i.e. if undisturbed below 10-15 m depth, the ground temperature is weakly affected by local above ground climate variations and maintains a stable temperature [76, 77, 78].
What factors should be considered when considering underground energy storage?
The hydrological characteristics of host rocks, the ground water distribution and chemistry are important criteria to be taken into account when considering underground energy storage.
Can energy storage system be charged and discharged at the same time?
Energy storage system can only be in one of the three states of charging, discharging, and not charging and discharging at each moment. The initial electricity storage and the last electricity storage should be equal to ensure that the energy storage system has the same control performance in the new dispatching cycle.
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