Generator torque control after grid event
AssigneeGeneral Electric Company
InventorsMiriam Monros Garrigosa, Matthew Paul Richwine
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Abstract
A method of operating a wind turbine comprising a generator in the event of a voltage dip is disclosed. The method comprises detecting an end of the voltage dip, determining an acceleration of a rotor of the generator, and increasing a torque of the generator when the end of the voltage dip is detected according to a selected torque profile. The selected torque profile is selected from a plurality predetermined torque profiles, wherein the predetermined torque profiles describe torque as a function of time. The selected torque profile is selected based on the determined acceleration of the rotor of the generator. Also provided are wind turbines configured for such methods.
Claims20
A method of operating a wind turbine comprising a generator in the event of a voltage dip, the method comprising:
- detecting an end of the voltage dip;
- determining an acceleration of a rotor of the generator,
- increasing a torque of the generator when the end of the voltage dip is detected according to a selected torque profile;
- wherein the selected torque profile is selected from a plurality of predetermined torque profiles, wherein the predetermined torque profiles describe torque as a function of time;
- and
- wherein the selected torque profile is selected based on the determined acceleration of the rotor of the generator.
A wind turbine comprising:
- a wind turbine rotor with a plurality of blades;
- a generator including a generator rotor and a generator stator, wherein the generator rotor is operatively coupled to the wind turbine rotor;
- a controller for controlling a torque of the generator, wherein the controller is further configured to:
- determine an end of a voltage dip on a grid connected to the generator;
- determine an acceleration of the generator rotor at the end of the voltage dip;
- apply a torque to the generator at the end of the voltage dip according to a predetermined torque profile selected from a plurality of torque profiles, wherein the predetermined torque profile describes torque as a function of time;
- and
- wherein the predetermined torque profile is selected based on the determined acceleration of the generator rotor at the end of the voltage dip.
A method of operating a wind turbine including a generator connected to an electrical grid, comprising:
- determining a voltage event on the electrical grid;
- reducing a torque of the generator during the voltage event;
- determining a recovery of the electrical grid after the voltage event;
- determining an acceleration of a rotor of the generator at a moment of recovery;
- increasing the torque of the generator substantially to a level prior to the voltage event;
- wherein the torque is increased with a first substantially constant torque rate or with a second substantially constant torque rate;
- and
- wherein the first or the second torque rate is selected based on the acceleration of the rotor of the generator at the moment of recovery.
Dependencies are inferred from the claim text.