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US 7,622,815 B2Granted
Low voltage ride through system for a variable speed wind turbine having an exciter machine and a power converter not connected to the grid
AssigneeIngeteam Energy, S.A.
InventorsGregorio Rivas, Iker Garmendia, Josu Elorriaga, Jesus Mayor, Javier Perez Barbachano, David Sole, Jorge Acedo
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Abstract
A variable speed wind turbine having a doubly fed induction generator (DFIG) includes an exciter machine mechanically coupled to the DFIG and a power converter placed between a rotor of the DFIG and the exciter machine which guarantees a stable voltage to the power converter. Thus, the power converter is not directly connected to the grid allowing the continuous operation of the system during a low voltage event in the grid.
Claims15
A method for operating a variable speed wind turbine comprising:
- converting wind energy into mechanical power using a rotor to rotate a drive train;
- converting the mechanical power into electrical power utilising a doubly fed induction generator (DFIG) coupled to the drive train;
- using an exciter machine coupled to the drive train and a power conversion system isolated from the power grid, to receive power generated by a rotor of the DFIG or to provide power required by the rotor of the DFIG;
- transferring electrical energy between the rotor of the DFIG and the drive train, through the power conversion system and the exciter machine in response to a low voltage event in the grid.
1 more element
A variable speed wind turbine comprising:
- a rotor shaft including at least one blade;
- a drive train coupled to the rotor shaft, the drive train including a doubly fed induction generator (DFIG), said DFIG having at least a stator connectable to a power grid;
- an exciter machine coupled to the drive train;
- and
- a power conversion device isolated from the grid and electrically coupled to a rotor of the doubly fed induction generator and to the exciter machine to transfer electrical power between the rotor and the exciter machine;
- wherein the exciter machine is used as a power supply for components of the wind turbine when the generator speed is at or above a predefined value.
3 more elements
Dependencies are inferred from the claim text.