Variable speed wind turbine having an exciter machine and a power converter not connected to the grid
AssigneeIngeteam, 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. Thus, the power converter is not directly connected to the grid avoiding the introduction of undesired harmonic distortion and achieving a better power quality fed into the utility grid. Moreover, the variable speed wind turbine includes a power control and a pitch regulation.
Claims36
A variable speed wind turbine system comprising:
- a first rotor shaft including at least one blade;
- a doubly fed induction generator coupled to the first rotor shaft and having a stator connectable to a power grid and having a shaft;
- an exciter machine coupled to the doubly fed induction generator shaft;
- and
- a power conversion system isolated from the grid and electrically connected to a rotor of the doubly fed induction generator and to the exciter machine to control the doubly fed induction generator.
A variable speed wind turbine system comprising:
- a rotor including at least one blade;
- a drive train coupled to the rotor, the drive train including at least one doubly fed induction generator (DFIG), said DFIG having a stator connectable to a power grid;
- exciter machine means for consuming power generated in a rotor of the DFIG in super-synchronous mode and for generating power for the rotor of the DFIG in sub-synchronous mode and coupled to the drive train;
- a power conversion means isolated from the grid for converting power transferred between the rotor of the DFIG and the exciter machine means.
A method for a variable speed wind turbine comprising:
- converting wind energy into mechanical power by driving a rotor;
- converting mechanical power into electrical power utilising a doubly fed induction generator (DFIG) in a drive train.
- supplying power to a power grid from a stator of the DFIG;
- 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 doubly fed induction generator or to provide power required by the rotor of the doubly fed induction generator.
A variable speed wind turbine comprising:
- a rotor including at least one blade;
- a drive train coupled to the rotor, the drive train including at least a doubly fed induction generator (DFIG), said DFIG having at least a stator connectable to a power grid;
- at least an exciter machine coupled to the drive train;
- and
- at least 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.
Dependencies are inferred from the claim text.