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Theses

Etude et modélisation hydraulique d'un système de stockage d'énergie par pilotage dynamique d'un circuit pompes-turbines-vannes

Abstract : A new method of compressed air energy storage at sea developed by the company SEGULA technologies is presented. REMORA is a storage system based on the quasi isothermal compression of air carried out by liquid pistons in the compression chambers. The latter are supplied by reversible centrifugal pumps which also act as turbines. The global system consists of elements forming a reversible energy cascade that can store energy in the form of compressed air in the underwater reservoirs or to return energy in the form of electricity in the electricity grid. The operating principle of REMORA is to always work at the nominal operating point of the pumps. This is why pumps operate at variable speed to continuously approach its nominal operating point. To optimize the operating range, a low-pressure pump and a high-pressure pump will have to take turns to supply the compression chambers. In addition, hydraulic valves are present at the inlet of each compression chamber and are connected to each pump by pipes. These valves open and close successively over a very short time depending on the state of compression or expansion of the air in each chamber. These valve switching events occur at the same time as rapid accelerations and decelerations of pump rotation speed that can induce transient flow into the system. The ODySEA demonstrator of the REMORA project with a few kW average power was built. Its objective is to analyse and simulate the various functions of the circuit during transient period. The experimental results are analysed in order to observe transient phenomena related to the rapid dynamics of the system, to verify the reliability of the REMORA concept, to detect possible problems and to remove the technological barriers. CFD modelling of the low-pressure pump is performed using STAR ccm+ calculation code in order to analyse in details the fluid flow in both modes (pump and turbine). The CFD model makes it possible to set up an elaborate pump model taking into account the different losses in the pump intended for the bond graph model. Finally, a dynamic model of the operation of the ODySEA hydraulic system, using the Bond Graph code, is proposed. A partial model, built on a simplified hydraulic circuit with two pumps and two liquids pistons, was developed and validated using the experimental results.
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https://pastel.archives-ouvertes.fr/tel-03675225
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Submitted on : Monday, May 23, 2022 - 8:22:56 AM
Last modification on : Friday, August 5, 2022 - 2:54:01 PM

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  • HAL Id : tel-03675225, version 1

Citation

Naly Ratolojanahary. Etude et modélisation hydraulique d'un système de stockage d'énergie par pilotage dynamique d'un circuit pompes-turbines-vannes. Energie électrique. HESAM Université, 2022. Français. ⟨NNT : 2022HESAE013⟩. ⟨tel-03675225⟩

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