Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2018-35
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
22 May 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
Control design, implementation and evaluation for an in-field 500 kW wind turbine with a fixed-displacement hydraulic drivetrain
Sebastiaan Paul Mulders1, Niels Frederik Boudewijn Diepeveen2, and Jan-Willem van Wingerden1 1Delft Center for Systems and Control, Faculty of Mechanical Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, the Netherlands
2DOT B.V., Raam 180, 2611 WP Delft, the Netherlands
Abstract. The business case for compact hydraulic wind turbine drivetrains is becoming ever stronger, as offshore wind turbines are getting larger in terms of size and power output. Hydraulic transmissions are generally employed in high load systems, and form an opportunity for application in multi-megawatt turbines. The Delft Offshore Turbine (DOT) is a hydraulic wind turbine concept replacing conventional drivetrain components with a single seawater pump. Pressurized seawater is directed to a combined Pelton-generator combination on a central multi-megawatt electricity generation platform. This paper presents the control design, implementation and evaluation for an intermediate version of the ideal DOT concept: an in-field 500 kW hydraulic wind turbine. It is shown that the overall drivetrain efficiency and controllability is increased by operating the rotor at maximum rotor torque in the below-rated region using a passive torque control strategy. An active valve control scheme is employed and evaluated in near-rated conditions.
Citation: Mulders, S. P., Diepeveen, N. F. B., and van Wingerden, J.-W.: Control design, implementation and evaluation for an in-field 500 kW wind turbine with a fixed-displacement hydraulic drivetrain, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2018-35, in review, 2018.
Sebastiaan Paul Mulders et al.
Sebastiaan Paul Mulders et al.

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Data set: Control design, implementation and evaluation for an in-field 500 kW wind turbine with a fixed-displacement hydraulic drivetrain S. P. Mulders, N. F. Boudewijn Diepeveen, and J.-W. van Wingerden https://doi.org/10.5281/zenodo.1250459
Sebastiaan Paul Mulders et al.

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Short summary
The modeling, operating strategy and controller design for an actual in-field wind turbine with a fixed-displacement hydraulic drivetrain is presented. An analysis is given on a passive torque control strategy for below-rated operation. As the turbine lacks the option to influence the system torque by a generator, the turbine is regulated by a spear valve in the region between below- and above-rated operation. The overall control design is evaluated on a real-world 500 kW hydraulic wind turbine.
The modeling, operating strategy and controller design for an actual in-field wind turbine with...
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