Project

Wavepiston has developed a unique, groundbreaking wave energy technology that can deliver both energy and desalinated water, but costs are still not competitive. The consortium of Wavepiston, Technical University of Denmark and Aalborg University, together with key suppliers in the value chain, will redesign key subcomponents of the Wavepiston technology to reduce weight and increase durability to reduce CAPEX and OPEX, and increase efficiency of the energy conversion for higher annual energy production. This will ensure a competitive LCOE right after the finalization of the project.

A strong Indonesian grid over a large geographic area is required in order to integrate wind, solar or other RES. HVDC links would allow transmitting carbon-neutral power from islands where its generation is more efficient and viable to those with high consumption. Consequently, the number of CFPP reduces, the percentage of electricity generated via RES increases and grid reliability improves by increasing the level of interconnection. Besides a strong contribution to reduce the Indonesian carbon footprint from electricity generation and improve the security of supply, other big prospects arise from having HVDC links:

Submarine cables between the main islands would lay in the vicinity of small islands, offshore oil platforms and offshore areas with high wind. The taping of these lower power areas to the main link would allow eliminating fossil generation at the small islands, as well as to ease the construction of offshore RES by reducing costs.
A modular approach through the years is possible, allowing a higher adaptability and a better business case from a step-by-step expansion
Boost economy growth outside Java, via RES power-plants, new/enhanced infrastructures, which lead to new local business opportunities
The results can be replicated not only for other island areas (e.g. Philippines), but also onshore in regions with high RES potential and weak grids, as Africa;
To have HVDC-VSC technology in Indonesia is a crucial backbone for a S.E. Asia electrical grid. The project will not address this, but its outcome is key for further development of electrical interconnection between S.E. Asia countries and/or to interface Indonesia with the Australia-ASEAN Power Link.

The purpose of the project is to analyze and develop models for describing the interaction of wind turbines and wind farms with other electricity production units and to analyze their properties with a view to power and frequency control and co-responsibility for system stability. Furthermore, the project will create a basis for assessing the limit for the share of wind energy in the Danish electricity system. The models will thus be able to analyze electricity systems with wind turbines, central power plants, combined heat and power units and energy storage, including the use of compensation units, etc. The project focuses on preparing the models from the transmission level, where in particular the expansion with large wind farms (onshore or offshore) and the problem of how the energy is to be transported to land from offshore farms (AC or DC transmission) are of interest. Through the project, models of the transmission network (AC and DC) with associated central combined heat and power units and loads and where the production from the decentralized combined heat and power plants is viewed from the transmission level will be built and implemented. Models of larger wind farms with different control strategies will be connected to this model. The models include and implement protection equipment and strategies for stability analysis. Wind farms with different generator/converter topologies are modeled and control strategies for power participation or frequency regulation on the grid are compared and optimized for production capability and/or stability conditions. The project is funded as a PSO project from Elkraft System and is being prepared by Birgitte Bak-Jensen, Zhe Chen and Hans Nielsen, Department of Energy Engineering, Aalborg University, Anca Hansen and Poul Sørensen, Risø, and Jesper Hjerrild, Elsam Engineering. In connection with the project, a Ph.D project is also being prepared by Akarin Suwannarat with the title Integration and control of wind farms in the Danish electricity system (see this).

An experimental study of float design is carried out with scale 1:40 models. Through tests in a wave laboratory, horizontal and vertical wave forces are measured under different influences for a wide range of float types. Initially, the effect of the float geometry is measured for a restrained float. Subsequently, the effect of the float's anchoring system is described where movements of the float under wave influence are possible.

AquaBuoy is a buoy that can convert energy in ocean waves into electricity. AquaBuOY consists of a 9m high float with a diameter of 6m, under which is fixed a 25m long vertical tube with an inner diameter of 4m. AquaBuOY is designed to have large vertical movements in relatively small buoys. By mounting a special hose pump inside the long vertical tube, the wave energy can be extracted by utilizing the differential movements between the vertical tube and the water column inside the tube. The project primarily deals with the design and dimensioning of the anchoring system. AquaBuOY is being developed in collaboration with AquaEnergy Group, USA and Rambøll. (Morten Kramer, Thomas Lykke Andersen, Peter Frigaard, Anders Augustesen.)

An CETPartnership project with the aim to enhance shared mooring system design for floating offshore wind farms.

Abstract:
The worldwide climate change is caused by the increased greenhouse gas (GHG) concentration in the atmosphere. To achevie the Paris Agreements 1.5 °C pathway the GHG carbon dioixde (CO2) must be reduced. Therefore according to the UN’s Climate Panel IPCC, a crucial tool to achieving the Paris Agreement is Carbon Capture, Utilisation and Storage (CCUS) which would be challenging to achieve without. CCUS is a technology where the CO2 emissions are reduced by capturing the CO2 and storing it in a geological site or utilising it for green fuel production. However, the CO2 cannot be stored or utilised if there is no connection between the capture site and the storage or utilisation site. Three primary forms of transportation are by trucks, ships or through pipelines. Pipeline transportation is the main way of transporting CO2. However, impurities like H2O, H2S, NOx, and SOx can compromise the transportation and cause corrosion or scaling, leading to huge economic costs, underlining the need for proper pipeline material selection and monitoring of these impurities. Furthermore, it is desired to limit the need for purification of the CO2 without having the risk of corrosion, becoming a cost balance between material and purification cost.
This PhD project will study the material integrity of the Carbon Capture Storage transportation infrastructure, focusing on the impurities and their negative impacts on the transportation infrastructure. Additionally, measure corrosion and monitor the impurities inside the CO2 transport pipeline.

Methods for predicting stochastic wave load responses in ships and offshore structures are developed. The methods
take into account the dynamic behaviour of the structures and at least some of the non-linearities in the wave induced
loadings. Numerical results obtained for actual structures are presented with special emphasis on their usefulness in
design procedures covering both extreme responses and fatigue damage predictions.

OLAMUR will demonstrate and promote multi-use low trophic aquaculture (MU-LTA) in both low and high salinity offshore waters, bringing together state-of-the- art practices in MU-LTA and key industry partners, achieving at least TRL7 and paving the way for a low- impact and low-carbon seafood industry.

The region of Southern Denmark has had a long historical tradition for a strong involvement in the maritime sector, but the region has for the last 50 years been especially known for its deep involvement in the offshore sector, with Esbjerg as a key location in Northern Europe. The sector is now well-established and continues to grow, currently undertaking a radical transformation. This development is influenced by different factors, including an increase in offshore oil and gas decommissioning, as well as the rapidly growing offshore wind farms and plans for building large energy islands. These islands will serve as electro fuel production and bunkering facilities but will also become hubs that facilitate better connections between the energy generated from offshore wind constructions and the zero emission energy systems ashore. These developments all lead to important challenges and opportunities for the maritime sector. For instance, a strong focus on the maritime offshore sector is essential to realize the plans for developing the energy offshore sector and the connected goals for costs, efficiency, sustainability, performance etc. in all stages of the life cycle, from design, construction, operation, and maintenance to the final decommissioning. The maritime offshore activities will therefore be essential for reaching the United Nations (UN) 2030 and 2050 climate targets. The idea of the project is to investigate multiple aspects of this transition.
The project portfolio consists of six interconnected work packages (WP 1-6) that serve as part of a holistic collaboration platform that will significantly energize the maritime research at SDU. The topics are interdisci-plinary and cover a wide range of maritime disciplines, such as:

• Sustainability, safety, and risks
• Energy efficiency, maintenance, propulsion technologies and fuels
• Business history
• Business and Logistics
• Regulation
• Human factors, health, socio-economic issues
• Naval architecture and maritime operations

All work packages, though separate in their research focus, are interconnected and important to the project, as the breadth and interdisciplinarity of the initiative is what makes it unique in a Danish context.