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.
Highlights
Wind energy has great potential of development and utilization for its pollution-free and renewable characteristics
The stator is directly connected to the grid and only slip power goes through the converter for the doubly fed induction generator (DFIG) in Type 3 wind turbine
In this paper a novel variable speed wind turbine based on an electromagnetic coupler with a synchronous generator directly coupled to the grid has been proposed
Summary
Wind energy has great potential of development and utilization for its pollution-free and renewable characteristics. The mainstream wind turbine concept is the variable-speed constant-frequency (VSCF), in which the rotor speed can change according to different wind speeds, a maximal wind power capture can be achieved This can result in smoother output power [1,2]. The stator is directly connected to the grid and only slip power goes through the converter for the doubly fed induction generator (DFIG) in Type 3 wind turbine. This allows for rating the converter to a fraction of the rated power [4], but the necessary gearbox results in the high cost and the need for regular maintenance. Matlab/Simulink and HAWC2 software tools; and Section 5 concludes the analysis
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