Low-head hydro power

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Hydropower is a mature and cost-competitive renewable energy source and plays a central role in the European electricity system by providing flexibility, reserves, and grid stability. However, expanding hydropower generation capacity and operational capabilities is increasingly constrained by environmental regulations, competing water uses, and limited opportunities for new infrastructure development. This study explores the feasibility of deploying hydrokinetic turbines within tailrace channels downstream

Hydropower is undergoing technological innovation as future development increasingly targets low-head sites (

Understanding how platform surge motion influences wake dynamics, downstream power production, and structural loads of floating offshore wind turbines (FOWTs) is essential for improving array-level energy efficiency. This study performs high-fidelity large-eddy simulations coupled with a validated elastic actuator line model to investigate two tandem FOWTs, both subjected to surge motions, operating in an atmospheric boundary layer. Surge motions with two nondimensional amplitudes and three reduced frequenc

The Antarctic Wind Atlas provides a high-resolution assessment of wind resource statistics across Antarctica. As climate concerns and the logistic costs of fuel in Antarctica rise, many research stations are looking to expand their renewable energy portfolios. Wind energy is a particularly promising option, with tens of wind turbines already operating on the continent. However, identifying suitable locations for these projects remains difficult due to the lack of reliable wind statistics. Utilizing 15 years

Hydropower, historically a cornerstone of Switzerland’s energy infrastructure, plays a vital role in balancing the intermittency of renewable energy sources such as wind and solar. Situated at the nexus of Europe’s energy system, Switzerland’s hydro dams act as colossal batteries, ensuring energy stability and flexibility for both national and European grids. However, climate change introduces significant challenges, including altered precipitation patterns, glacier retreats, and shifts in natural inflow se

Multi-rotor wind turbines have shown a faster wake recovery than equivalent single-rotor turbines. In this work the potential benefit of a wind farm with multi-rotor turbines is assessed through the optimization of the turbine positions using the CEGA wind farm optimization algorithm, for different power densities. The EPFL analytical wake model is used to compute the power output at each turbine. The wake growth rate in this model depends on the incoming turbulence intensity. However, added turbulence inte

Pumps running as turbines are suitable hydraulic machines for micro hydropower applications. The selection of the proper pumps to install in a given site still remains a major challenge, as pump manufacturers do not provide the characteristic curves data i ...

Around 60% of Switzerland’s power production is provided by hydropower. Despite its numerous advantages, the high fluctuations in turbined discharges cause hydropeaking at downstream rivers. Due to the environmental impacts of hydropeaking on fauna and flora, the Swiss Federal Act on the Protection of Waters requires dam operators to put in place remediation measures for hydropeaking effects before the end of 2030. At the same time, the Energy Strategy 2050 and the decision on the progressive withdrawal fro

Hydropower plant units operating in off-design conditions are subject to cavitation flow instabilities, potentially inducing hydro-acoustic resonances under certain conditions. They can be predicted by using one-dimensional numerical models of hydropower p ...

Sediment management of alpine rivers is crucial to ensure sustainable hydropower production. Dams inhibit not only biological consistency but also drastically restrain natural sediment dynamics. Upstream of the dam, coarse material is accumulated, leading to a progressive sedimentation of the reservoir. This causes a reduction in the effective water head and can even lead to the blockage of lowerlying operation organs. Downstream of the dam, reduced flow velocities promote the settling of suspended sediment

The run-of-river hydro power plant of Lavey, situated in the Western part of Switzerland, is an important source of renewable energy for the city of Lausanne. With its annual production of roughly 400 GWh it covers approximately a third of its consumptions per year. Even given the relatively short distance of 4 km between its water intake and power plant, the total head of the hydroelectric development is still roughly 40 meters and with the design flow given at 200m3/s, the installed power is considerable.

Cavitating tip-leakage vortices appear in several hydrodynamic flows such as marine propellers or Kaplan turbines. Cavitating computations are a challenging topic since several keys issues are an ongoing work such as the definition of a universal mass sour ...

Full load pressure surge limits the operating range of hydro-electric generating units by causing significant power output swings and by compromising the safety of the plant. It appears during the off-design operation of hydraulic machines, which is increa ...

At part load conditions, Francis turbines experience the formation of a cavitation vortex rope at the runner outlet whose precession acts as a pressure excitation source for the hydraulic circuit. This can lead to hydro-acoustic resonances characterized by ...

Due to the massive penetration of alternative renewable energies, hydropower is a key energy conversion technology for stabilizing the electrical power network by using hydraulic machines at off design operating conditions. At full load, the axisymmetric c ...

Water supply networks in cities with sloping topography may have a considerable potential for the installation of micro hydropower plants. Since these water supply networks are complex systems with many constraints, the identification of the best locations for such micro hydropower installations is a difficult task. With her research project, Dr. Irene Samora made a significant contribution for answering the question how the available low-head hydropower can be recovered in an optimized way in such complex

Francis turbines are subject to various types of the cavitation flow depending on the operating condition s. In order to compensate for the stochastic nature of renewable energy sources, it is more and more required to extend the operating range of the gen ...

Rural electrification in Cameroon was in the past planned by the Government through the Ministry of Water and Energy. This issue was addressed through grid extension using three-phase medium voltage, a single wire earth return solution, or off-grid thermal plants for remote localities. Because the architecture of the electricity grid is radial isolated, this leads to many technical problems and a limited rate of electrification, especially in remote areas. The country learned a lot from failures and realize

Hydraulic machines operating in a wider range are subjected to cavitation developments inducing undesirable pressure pulsations which could lead to potential instability of the power plant. The occurrence of pulsating cavitation volumes in the runner and t ...

Hysteresis phenomena demonstrate the lag between the generation and the removal of some physical phenomena. This paper studies the hysteresis phenomena of the head-drop in a scaled model pump turbine using experiment test and CFD methods. These lag is indu ...

Low-head hydro power

Chat with Graph Search

Expanding Hydropower Capabilities Using Hydrokinetic Turbines in Tailrace Channels: Feasibility, Site Optimization, and System Implications

Full-scale validation gaps and opportunities for low-head hydropower: a review and perspective

Impact of surge motion on wake characteristics, power performance and fatigue loads of two tandem floating wind turbines

Antarctic Wind Atlas: Gradient-Boosting based Quantile Mapping on 15 years of Climatological Reanalysis

The Alpine Battery: Sustaining Europe’s Renewable Integration - Assessing and Optimizing Switzerland’s Hydropower Infrastructure for Future Challenges

Multi-rotor Wind Farm Layout Optimization

Hill chart modelling using the Hermite polynomial chaos expansion for the performance prediction of pumps running as turbines

Balancing hydropeaking mitigation and hydropower production

Prediction of hydro-acoustic resonances in hydropower plants by a new approach based on the concept of swirl number

Integrated sediment management of alpine rivers

Étude géotechnique des ouvrages souterrains de l'extension de la centrale hydroélectrique de Lavey

RANS computations of a confined cavitating tip-leakage vortex

Experimental Hydro-Mechanical Characterization of Full Load Pressure Surge in Francis Turbines

Dynamics of the precessing vortex rope and its interaction with the system at Francis turbines part load operating conditions

RANS computations for identification of 1-D cavitation model parameters: application to full load cavitation vortex rope

Optimization of low-head hydropower recovery in water supply networks

Numerical and experimental evidence of the inter-blade cavitation vortex development at deep part load operation of a Francis turbine

New Renewable Energy Promotion Approach for Rural Electrification in Cameroon

Experimental investigation of the local wave speed in a draft tube with cavitation vortex rope

Hysteresis phenomena in hydraulic measurement