Design and Optimization of Scour Protection for Offshore Wind Platform DolWin Beta

Volume 9A: Ocean Renewable Energy ◽

10.1115/omae2014-23154 ◽

2014 ◽

Author(s):

Ben de Sonneville ◽

Greta van Velzen ◽

Jan Wigaard

Keyword(s):

Shear Failure ◽

Wind Farms ◽

Power Converter ◽

Offshore Wind ◽

Long Term Effects ◽

Offshore Wind Farms ◽

Design And Optimization ◽

German Coast ◽

Set Up ◽

Scour Protection

DolWin Beta is a large offshore power converter platform, which will be used to connect multiple offshore wind farms off the German coast to the main land. It will be located in a water depth of 29m, where tidal currents and harsh wave conditions may cause soil erosion (scour) and possibly undermining of the foundation if not protected properly. Laboratory experiments were conducted in order to investigate the scouring around the foundation and provide an optimized layout for scour protection. This paper summarizes the initial scour assessment, the design approach for scour protection, the experimental set-up, test program, monitoring techniques and results of the experiments. The test results revealed which zones of the scour protection around the foundation were most sensitive to shear failure and edge scour. In steps, the scour protection was strengthened in these zones and reduced in the more sheltered areas. The tests showed that the magnitude of rock displacement, apart from wave height and direction, was significantly influenced by the superimposed current velocity. Based on a test without scour protection, the sequence of installation was adjusted to minimize risks of scour during installation. Finally, a stable scour protection layout was obtained that was fully verified under extreme storms and long-term effects of edge scour.

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A Generic Power Converter Sizing Framework for Series-Connected DC Offshore Wind Farms

IEEE Transactions on Power Electronics ◽

10.1109/tpel.2021.3106578 ◽

2021 ◽

pp. 1-1

Author(s):

Marten Pape ◽

Mehrdad Kazerani

Keyword(s):

Wind Farms ◽

Power Converter ◽

Offshore Wind ◽

Offshore Wind Farms

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Heuristics-based design and optimization of offshore wind farms collection systems

Journal of Physics Conference Series ◽

10.1088/1742-6596/1356/1/012014 ◽

2019 ◽

Vol 1356 ◽

pp. 012014

Author(s):

Juan-Andrés Peréz-Rúa ◽

Daniel Hermosilla Minguijón ◽

Kaushik Das ◽

Nicolaos A. Cutululis

Keyword(s):

Wind Farms ◽

Offshore Wind ◽

Offshore Wind Farms ◽

Design And Optimization

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Metaheuristic-based Design and optimization of Offshore Wind Farms Collection Systems

2019 IEEE Milan PowerTech ◽

10.1109/ptc.2019.8810583 ◽

2019 ◽

Author(s):

Daniel Hermosilla Minguijon ◽

Juan-Andres Perez-Rua ◽

Kaushik Das ◽

Nicolaos A. Cutululis

Keyword(s):

Wind Farms ◽

Offshore Wind ◽

Offshore Wind Farms ◽

Design And Optimization

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HVDC-Based Multilevel Modular Power Converter for Offshore Wind Farms

2018 International Conference on Power Energy, Environment and Intelligent Control (PEEIC) ◽

10.1109/peeic.2018.8665408 ◽

2018 ◽

Cited By ~ 1

Author(s):

Nityanand Nityanand ◽

Ashok Kumar Pandey

Keyword(s):

Wind Farms ◽

Power Converter ◽

Offshore Wind ◽

Offshore Wind Farms

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Demonstration of Offshore Wind Integration with an MMC Test Bench featuring Power-Hardware-in-the-Loop Simulation

10.5194/wes-2020-27 ◽

2020 ◽

Author(s):

Fisnik Loku ◽

Philipp Ruffing ◽

Christina Brantl ◽

Ralf Puffer

Keyword(s):

Power Amplifiers ◽

Test Bench ◽

Wind Farms ◽

Full Scale ◽

Offshore Wind ◽

Hardware In The Loop ◽

Offshore Wind Farms ◽

System Behaviour ◽

Set Up ◽

Ac Transmission

Abstract. The integration of offshore wind energy into the existing power system is continuously growing. With the increasing distance of the offshore wind farms (OWF) to the onshore AC transmission systems, HVDC systems are emerging as a preferable solution for the connection of OWF due to their techno-economic advantages in comparison to AC subsea connections. Integrating HVDC systems into the existing AC systems poses various planning and technological challenges. To be able to overcome these challenges a variety of studies has to be conducted, e.g. the HVDC system behaviour under faults. Simulations using electromagnetic transient (EMT) tools represent a generally accepted method to conduct the relevant studies. To increase the trust in the developed concepts subsequent hardware demonstrations would be preferable. However, performing these investigations with full-scale components is often not an option due to unavailability and high costs. As an alternative way, Power-Hardware-in-the-Loop (PHiL) approaches are considered. In this context, a new and worldwide unique laboratory demonstrator - the MMC Test Bench - is set up at RWTH Aachen University as part of the Horizon2020 project PROMOTioN. Here, laboratory-scaled Modular Multilevel Converters (MMCs) are used, which are connected on the DC side by cascaded Pi-line segments. The adjacent AC grids (i.e. offshore wind farms, AC transmission networks) are represented by real-time simulators (RTS) and connected to the MMCs via high bandwidth linear power amplifiers (PA). In this work, the MMC Test Bench is initially described. Afterwards, the PHiL set-up to demonstrate the implemented controls for an OWF connected to shore via an HVDC link is explained. To allow the joint operation of the hardware set-up and the RTS in a stable manner, adequate PHIL interfaces algorithms have to be designed and the scaling between the RTS, the power amplifiers and the hardware is explained. The connection of the OWF represents a special challenge for PHiL demonstrations as the OWF represents a weak AC system with the MMC in grid forming mode. In a next step, the results of the successful demonstration of the interconnection of the OWF via an HVDC link with the MMC Test Bench are presented. The system behaviour in stationary and transient operation is analysed based on the wind farm start-up sequence as well as different cases of wind infeed fluctuations. The results are compared to a simulated full-scale model and deviations are discussed.

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