General Electric Company

Adwen Gmbh

Areva Wind Gmbh

Wilhelm Janssen

Robert William Delmerico

Nicholas Wright Miller

Werner Gerhard Barton

Andreas Bücker

Henning Lütze

Till Hoffmann

Detlef Menke

Henning Luetze

Patrick Achenbach

Andreas Buecker

Ralf Hagedorn

A wind turbine comprises a permanent magnet synchronous generator, a main converter, a main converter controller, a wind turbine master controller and an electrical power supply stage comprising an electrical energy storing device. A startup of the wind turbine can be performed using electrical energy from the electrical energy storing device independent from a power supplying grid and/or a combustion engine. After startup, the wind turbine can be operated in an island mode by controlling an intermediate voltage of the main converter by the main converter controller and retrieving power from the synchronous generator independent from the electrical energy storing device.

Method of operating a wind turbine without grid connection and wind turbine

The method relates to the operation of a frequency converter of a generator in particular of a wind energy turbine, in the event of a substantial grid voltage drop, wherein the frequency converter () comprises an AC/DC converter (), to be connected to the generator (), a DC/AC converter () to be connected to the voltage grid (), and a DC link circuit () for connecting the AC/DC converter () to the DC/AC converter (). The method comprises the step of reducing an output voltage of the DC link circuit () for increasing an output current of the DC/AC converter () and/or reducing the operation frequency of electronic switches () of the DC/AC converter () for increasing the output current of the DC/AC converter ().

Method for operating a frequency converter of a generator

A wind turbine includes an asynchronous generator having a rotor and a stator, means for determining an actual torque-speed curve of the generator, means for determining an actual grid frequency, and means for determining a shifted torque-speed curve in response to the determined actual grid frequency if the determined actual grid frequency is higher than a predetermined upper frequency limit or lower than a predetermined lower frequency limit. The means for determining a shifted torque-speed curve is further adapted to determine the shifted torque-speed curve such that an increase in the rotor voltage of said generator rotor is counteracted when shifting the actual torque-speed curve to the shifted torque-speed curve. The wind turbine further includes means for shifting the actual torque-speed curve of the generator to the shifted torque-speed curve.

Wind turbine and method for operating same

The invention relates to Method of operating a wind turbine, wherein rotor windings of an induction generator, which comprises stator coils coupled to a voltage grid, fed with rotor currents by a feed-in unit are driven by a rotor of the wind turbine; wherein the frequencies of the fed-in rotor currents are controlled depending on the rotor rotation frequency and the feed-in unit is electrically decoupled from the rotor windings in the case predetermined variations of the grid voltage amplitude and the rotor current feed-in is resumed after the decoupling caused by the variation of the grid voltage amplitude, when the currents generated in the rotor windings by the variation have declined to a predetermined value.

Method for operating a wind power plant and method for operating it

The present invention relates to s wind turbine having a power generator for generating power for a first power line of a power grid; said wind turbine comprising a first transformer having a first primary coil connected to said power generator and a first secondary coil connected to said first power line for transforming a first primary voltage (vp) across said first primary coil to a first secondary voltage (vs) across said first secondary coil; further, the wind turbine according to the invention comprises a first electric circuit connected to said first primary coil; said first electric circuit having a first switching element for providing a first current path parallel to said first primary coil if said first secondary voltage (vs) exceeds a predetermined first voltage limit value.

Wind turbine over-voltage exposure

A method of operating a wind turbine, wherein the wind turbine may include rotor windings of an induction generator, which includes stator coils coupled to a voltage grid, fed with rotor currents by a feed-in unit are driven by a rotor of the wind turbine; wherein the frequencies of the fed-in rotor currents are controlled depending on the rotor rotation frequency and the feed-in unit is electrically decoupled from the rotor windings in the case predetermined variations of the grid voltage amplitude and the rotor current feed-in is resumed after the decoupling caused by the variation of the grid voltage amplitude, when the currents generated in the motor windings by the variation have declined to a predetermined value.

A wind energy turbine includes a tower, a nacelle rotatably supported by the tower, a rotor rotatably supported by the nacelle, and at least one unit to be cooled and arranged in the tower and/or the nacelle. The unit is adapted to be cooled by a cooling medium flowing in a cooling circuit from the unit to at least one heat exchanger. The at least one heat exchanger is located outside of the tower and/or nacelle and configured to be cooled by ambient air.

Wind energy turbine

A wind turbine. The wind turbine includes a blade pitch control system to vary a pitch of one or more blades and a turbine controller coupled with the blade pitch control system. A first power source is coupled with the turbine controller and with the blade pitch control system to provide power during a first mode of operation. Uninterruptible power supplies coupled to the turbine controller and with the blade pitch control system to provide power during a second mode of operation. The turbine controller detects a transition from the first mode of operation to the second mode of operation and causes the blade pitch control system to vary the pitch of the one or more blades in response to the transition.

Growing community of inventors

Saterland, Germany

Wilhelm Janssen