Future Electrical Generator Technologies for Offshore Wind Turbines

In this article, different electric generator topologies for offshore wind turbines will be reviewed. Although, the most common generator type used in the onshore wind turbines is the doubly-fed induction generator, different generator designs are proposed for large offshore wind turbines, which operate in harsher conditions and are difficult to maintain. Some of these designs are direct-drive permanent magnet generators, hydraulic power take-off systems and superconducting generators.
Engineering & Technology Reference


Integration of Offshore Wind Farm Plants to the Power Grid using an HVDC line Transmission
Berkani, Abderrahmane; Pourkeivannour, Siamak; Negadi, Karim; Boumediene, Bachir; Allaoui, Tayeb; Ertan, Hulusi Bülent (2019-01-01)
This paper investigates an integration of Offshore Wind Farm Plants with Power Grid Based on an HVDC line Interconnection. Large offshore wind farms are installed in the North Sea area using modern multi-megawatt wind turbines. The Voltage source converter - high voltage direct current VSC-HVDC is a suitable means of integrating such large and distant offshore Wind Power Plants (WPP) which need long submarine cable transmission to the onshore grid. The offshore network then becomes very different from the c...
Hybrid excited synchronous generator design and comparison of direct drive wind turbines
Akgemci, Aysel; Keysan, Ozan; Department of Electrical and Electronics Engineering (2019)
Various types of electrical generators are used in wind turbines and there is not an agreement on the best generator type. Although, high speed Doubly Fed Induction Generators (DFIGs) are still the most common generator topology utilized in wind turbine systems, there is a trends toward direct-drive Permanent Magnet Synchronous Generators (PMSGs), as they are more efficient and reliable. However, permanent magnets (PMs) induce uncontrollable voltage due to the fixed flux resulting from PM excitation. Conven...
Experimental study on power curtailment of three in-line turbines
Bartl, Jan; Ostovan, Yasar; Uzol, Oğuz; Saetran, Lars (Elsevier BV; Elsevier BV; 2017-01-20)
A dataset of wind tunnel power and wake flow measurements on a setup of three aligned model wind turbines is presented. The power outputs of the three turbines are in good agreement with measurements from a full-scale wind farm of similar inter-turbine spacing. A comparison of the wake flow behind the first row and the second row shows a significantly higher mean velocity loss behind the second row justifying a further power drop from the second to the third row turbine. Curtailing the front row turbine to ...
Towards more reliable and cost effective superconducting generators for wind turbines
Keysan, Ozan; Burchell, J.; Mueller, M.A. (2014-01-01)
For large(~10 MW) wind turbines, direct-drive superconducting generators are proposed to reduce the tower head mass, which help to reduce the installation costs. Most of the existing designs has a very similar topology: a synchronous machine with a rotating superconducting field winding. However, this topology may not be the most suitable design for harsh offshore conditions. A novel transverse flux design is presented in this paper. The design has stationary and modular superconducting field windings combi...
Investigation of inertial support limits in wind turbines and the effects on the power system stability
Duymaz, Erencan; Keysan, Ozan; Department of Electrical and Electronics Engineering (2019)
In this study, the inertial support implementation is studied for variable speed wind turbines with a full-scale power electronics. To increase the active power as desired, Machine Side Converter is modified with an additional control loop. In the first part of the thesis, active power of the wind turbine is increased to the limits and the maximum achievable active power is found out to be restricted by the wind speed. It is found that the wind turbine can increase its output power by 40% of rated power in ...
Citation Formats
O. Keysan, “Future Electrical Generator Technologies for Offshore Wind Turbines,” Engineering & Technology Reference, pp. 0–0, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/44045.