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Wraae
Helle Wraae, Brylle DK
| Patent application number | Description | Published |
|---|---|---|
| 20090273187 | Control Method - A generator of a wind turbine is at low power conditions operated as a motor by control of a frequency converter to feed electric power from an electric power transmission network to the generator for raising the speed of the wind rotor above a predetermined level for lubricating rotating parts of a drive train of the wind turbine. | 11-05-2009 |
Leif-Erik Wraae, Tommerup DK
| Patent application number | Description | Published |
|---|---|---|
| 20090171509 | Electric Power Flow Control - A farm including a plurality of electric power generation units connected to a grid point of a power network. The power generation units are organized in a plurality of upstream branches. Each upstream branch is separable from an adjacent downstream branch by an interrupter. | 07-02-2009 |
| 20100292852 | Wind mill power flow control with dump load and power converter - A wind mill apparatus for generating electric power to a grid point of an electric network. The apparatus includes a wind rotor, an electric generator operatively connected to the wind rotor, and an electric multiphase ac link operatively connecting the generator to the grid point. The ac link includes a first current path including a switchgear, a second current path including a dc link including a first converter operatively connected to the generator, a second converter operatively connected to the grid point, and a capacitor operatively connected between the conductors of the dc link. The ac link further includes a connectable multiphase dump load for blocking during a fault condition on the network the reactive power flow in the ac link, yet providing a reduced transfer of active power. | 11-18-2010 |
Leif-Erik Wraae US
| Patent application number | Description | Published |
|---|---|---|
| 20090273187 | Control Method - A generator of a wind turbine is at low power conditions operated as a motor by control of a frequency converter to feed electric power from an electric power transmission network to the generator for raising the speed of the wind rotor above a predetermined level for lubricating rotating parts of a drive train of the wind turbine. | 11-05-2009 |
Leif-Erik Wraae, Vasteras SE
| Patent application number | Description | Published |
|---|---|---|
| 20090218820 | Power Converter Arrangement and Method - A power converter arrangement for connecting an induction generator to an electric power network comprises a first path provided for transferring electric power from the induction generator to the electric power network during a first operation condition, and a second path provided for transferring electric power from the induction generator to the electric power network during a second operation condition, where the first path includes an AC-AC converter and the second path includes a switch. A capacitor arrangement is interconnected between the induction generator and the first and second paths and a first AC reactor device is interconnected between the capacitor arrangement and the first and second paths, where the capacitor arrangement is provided for compensating for a magnetization current of the induction generator. | 09-03-2009 |