Publication

The ALPHEUS project will play an important role in renewable energy, especially in augmenting grid stability through low head pumped hydro energy utilization and storage.

Find below all the publications related to the project.

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Low-Head Pumped Hydro Storage: A Review on Civil Structure Designs, Legal and Environmental Aspects to Make its Realization Feasible in Seawater
The energy transition requires large-scale storage to provide long-term supply and short-term grid stability. Though pumped hydro storage is widely used for this purpose, regions without natural topography do not have the potential for traditional high-head pumped hydro storage. To address this, multiple projects for low-head and seawater pumped hydro storage have been proposed, though few have been implemented. Here, we review the state of the art of the components of low-head seawater pumped hydro storage projects, for construction in shallow seas or integrated into coastal defenses.

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A Head Loss Pressure Boundary Condition for Hydraulic Systems
Despite the increase in computational power of HPC clusters, it is in most cases not possible to include the entire hydraulic system when doing detailed numerical studies of the flow in one of the components in the system. The numerical models are still most often constrained to a small part of the system and the boundary conditions may in many cases be difficult to specify. The main effects of the system are well captured by the head Loss Pressure boundary condition. It is thus a useful and trustworthy boundary condition for incompressible flow simulations of components in a hydraulic system.

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Drivetrain Architectures for a Mechanically Decoupled Contra-Rotating Reversible Pump-Turbine
With the rise of renewable energy production in the pan-European grid, the need for flexible energy storage is experiencing a rapid increase. Pumped hydropower storage has proven viability due to its long lifespan and cost-effectiveness. The ALPHEUS project will implement pumped hydropower storage for flat topographies to augment grid stability in adjacent regions. To ensure optimal efficiency and fast switching times in these low head applications, a contra-rotating axial Reversible Pump-Turbine (RPT) is designed.

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Numerical Analysis of an Initial Design of a Counter-Rotating Pump-Turbine
The paper presented at the IAHR conferences ‘Numerical Analysis of an Initial Design of a Counter-Rotating Pump-Turbine’ has been published by IOPscience. The ALPHEUS Horizon 2020 EU project has the aim to develop a low-head hydraulic pump-turbine which can work as a grid stabilising unit. This work presents numerical results of an initial hub-driven counter-rotating pump-turbine design within ALPHEUS. Computational fluid dynamics simulations are carried out in both prototype and model scale, for pump and turbine modes, and under steady-state and unsteady conditions.

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Flow Characteristics of Preliminary Shutdown and Startup Sequences for a Model Counter-Rotating Pump-Turbine
Pumped Hydropower Storage (PHS) is the maturest and most economically viable technology for storing energy and regulating the electrical grid on a large scale. Due to the growing amount of intermittent renewable energy sources, the necessity of maintaining grid stability increases. Most PHS facilities today require a geographical topology with large differences in elevation. The ALPHEUS H2020 EU project has the aim to develop PHS for flat geographical topologies.

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The Contribution of Low head Pumped Hydro Storage to a successful Energy Transition
The ALPHEUS project will introduce a low-head PHS for a relatively flat topography. In this paper, a grid-forming controlled inverter coupled with low-head PHS that can contribute to the grid stability is introduced, emphasising its ability to provide different AS, especially frequency control, through the provision of synthetic system inertia, as well as fast Frequency Containment Reserves (fFCR).

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