Finite element modelling of an energy-geomembrane underground pumped hydroelectric energy storage system

Abstract

The increasing need for energy storage technology has led to a massive interest in novel energy storage methods. The energy geomembrane system is such a novel energy storage method. The concept of the system is briefly introduced, and a holistic numerical model of the system is presented. The model uses advanced finite-element techniques to model the energy storage system using fluid cavity elements. The developed geomembrane energy system is modelled with different constitutive models to represent the soil behaviour: a linear elastic model, a nonlinear Mohr-Coulomb model, and a hypoplastic constitutive model. The consequences of these different models on the results are studied. Hereby, the focus is the first inflation and deflation cycle of the system.

On the long-term behaviour of a deep underground gravity energy stor-age system: A numerical approach using the HCA model.

“…However, to achieve a remarkable energy storage capacity with this concept, large volume fluxes are required. Numerical investigations [6,9] in addition to large and small-scale laboratory tests [2,8] show that the resulting large deformations of the soil can cause a stability problem in the soil and can result in large energy losses and soil collapse. To overcome these drawbacks, the concept of a deep cavity was presented in [3], which is schematically shown in Figure 1.…”