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Energies 2013, 6(11), 6120-6136; doi:10.3390/en6116120

A Novel Wind Turbine Concept Based on an Electromagnetic Coupler and the Study of Its Fault Ride-through Capability

1
State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
2
Department of Wind Energy, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, Roskilde 4000, Denmark
*
Author to whom correspondence should be addressed.
Received: 13 August 2013 / Revised: 11 October 2013 / Accepted: 13 November 2013 / Published: 22 November 2013
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Abstract

This paper presents a novel type of variable speed wind turbine with a new drive train different from the variable speed wind turbine commonly used nowadays. In this concept, a synchronous generator is directly coupled with the grid, therefore, the wind turbine transient overload capability and grid voltage support capability can be significantly improved. An electromagnetic coupling speed regulating device (EMCD) is used to connect the gearbox high speed shaft and synchronous generator rotor shaft, transmitting torque to the synchronous generator, while decoupling the gearbox side and the synchronous generator, so the synchronous generator torque oscillations during a grid fault are not transmitted to the gearbox. The EMCD is composed of an electromagnetic coupler and a one quadrant operation converter with reduced capability and low cost. A control strategy for the new wind turbine is proposed and a 2 MW wind turbine model is built to study the wind turbine fault ride-through capability. An integrated simulation environment based on the aeroelastic code HAWC2 and software Matlab/Simulink is used to study its fault ride-through capability and the impact on the structural loads during grid three phase and two phase short circuit faults.
Keywords: variable speed wind turbine; electromagnetic coupler; synchronous generator; voltage support capability; HAWC2; structural loads variable speed wind turbine; electromagnetic coupler; synchronous generator; voltage support capability; HAWC2; structural loads
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MDPI and ACS Style

You, R.; Barahona, B.; Chai, J.; Cutululis, N.A. A Novel Wind Turbine Concept Based on an Electromagnetic Coupler and the Study of Its Fault Ride-through Capability. Energies 2013, 6, 6120-6136.

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