The AFC4Hydro project addresses the development of a novel Active Flow Control (AFC) system for improving off-design operation of hydraulic turbines by mitigating deleterious flow phenomena during steady and transient operation including ramping of produced load. The main effect being increased reliability and flexibility, and reduced wear and tear. More specifically, this innovative and affordable AFC solution, allowing efficient utilization of existing hydraulic turbines, is planned to be validated at small scale in a model turbine and at large scale in two prototype turbines. A combination of technologies will be used to reduce the pressure and load fluctuations exerted on the machine induced by the draft tube flow using: (1) injection of pulsating momentum (IPM) with a specific frequency, amplitude and phase by means of actuators; (2) injection of continuous momentum (ICM) in the form of water jets with controlled speed and orientation directed against the swirling flow. A structural health monitoring (SHM) system will be developed to evaluate the effects of the injection systems in the structural response of the rotor, generator and bearings. These measurements will be used to optimise the machine performance. For that, a Controller will be programmed and tuned to reduce pressure fluctuations, structural loads and induced vibrations in real-time operation by continuously adjusting the injection systems. The final AFC system will also be tested against demanding transients like ramp up and ramp down. Special attention will be given to mitigate the powerful and dangerous flow instability provoked by the vortex rope breakdown. The success of the proposal will permit to extend the operating range of already existing turbines beyond the stablished safety limits, to increase their efficiency at off-design operation, to be able to face more frequent transients and to reduce the maintenance and operating costs.

Cost of energy (COE) is the most important single factor in deployment of renewables in the energy system. Reduction of COE is, among other things, directly related to operational control of Wind Power Plants (WPP) as a whole and the individual wind turbines (WT) within them. In the Total Control project the COE reduction will be pursued by developing and validating advanced integrated WPP/WT control schemes, where all essential interactions between the WPP WT’s are accounted for including both production and load aspects. Optimal WPP control is traditionally formulated as a one-parameter optimization problem focusing on the WPP production only. However, ultimately the optimal WPP performance should result from a multi objective optimization problem, where the optimal economic performance of a WPP is pursued over the WPP life time, conditioned on external grid demands. This is what Total Control is about. The suggested integrated WPP/WT control approach seeks the optimal economical WPP revenue – i.e. the optimal economic balance between WPP power production and WPP operational costs. This is done by developing hierarchically coupled WPP and WT control schemes conditioned on a set of superior grid operator demands. In the WPP control design phase information is only fed from the WPP controller to the individual WT controllers, whereas in on-line operational control available WT and WPP flow field information will be assimilated into the WPP control for optimal system performance. Furthermore, the WPP controller will also make use of current market information (e.g. energy price, demand for ancillary services etc.) as well as information about the state of individual turbines (e.g. current operational state, maintenance requirements and component lifetime consumption) to allow COE objectives to be optimised dynamically.

The overarching aim of STORE2HYDRO is to introduce a new mindset for storage of electricity in connection with existing hydropower. Relatively small adjustments to existing hydropower facilities by retrofitting reversible pump turbine technology would allow the European electricity storage capacity to increase by 22TWh/y or more. The aim will be achieved by: i) Validated innovative mechanical solutions to TRL4-5 for larger-scale pumped, longer-duration storage of electricity in existing high head Reservoir-to-Reservoir (RtR) and low head Run-of-River (RoR) hydropower facilities. ii) Mapping untapped hydropower sources for long term electricity storage in Europe increasing the availability, robustness and safety of energy storage solutions. The novel technologies will enable the operators to run hydropower stations in a more efficient, cost effective and flexible manner than today also adapting to the energy system. This is without changing the regulating heights or volume of the reservoir/river reaches following the European Green Deal priorities. Also, turbine manufacturers can introduce new components for cost-effective retrofitting of pumped storage. The technology will be validated with detailed LCA and by consideration of CAPEX and OPEX of potential future plant. The 1st innovation is based on unique design solutions for a retrofittable reversible pump turbine technology enabling a cost-effective solution free of cavitation, enhanced flexibility, and reduced losses. The 2nd innovation is enabled by digital twins including hydraulic and sediment dynamics for pumped-storage. These tools give detailed information about the status of the current storage increasing the availability and robustness of the mechanical storage of electricity in existing RoR and RtR systems adapting to, for example, predictions of generation of intermittent electricity from wind and solar. Practically this will imply new storage of electricity in existing reservoirs and river stretches.

The H-HOPE project addresses the development and demonstration of innovative and sustainable energy harvesting systems capable of recovering hidden hydro energy from existing piping systems, open streams and open channels. This new technology is based on both the use of piezoelectric materials attached to submerged bodies with deforming walls and of electromagnetic regulators absorbing the transverse motion of oscillating bodies inside flows. The power density of the proposed energy harvesters will be significantly improved thanks to the multi-physics design approach and to the innovative adaptive power take-off (PTO) allowing to tune the resonance frequency of the coupled fluid-structure-electrical system and thus increase the flow induced vibrations under lock-in conditions. Eight (8) different case studies representative of actual industrial water facilities and free-flowing streams located across Europe will be used to experimentally test and validate the effectiveness of the technology in adequate and real operating conditions reproduced in laboratories. In parallel, numerical models will be developed and included in a multi-physics design strategy so as to optimize their design whereas an adaptive PTO will be developed and customize on the energy harvesting system so as to maximize the performance even in variable operating conditions. The assessment of the environmental and socio-economic impacts will be used to demonstrate the value of the selected case studies and the sustainability of the proposed technology aimed also at increasing the resilience of the water facilities. In order to extend this knowledge and promote the applications of the H-HOPE technologies to potential prosumers, an open-access and open-source do-it-yourself platform will be set up. As a result, the H-HOPE platform will certainly contribute to reduce the negative effects of the climate change and to reduce the CO2 emissions while increasing the energy independence of the EU.