Wind turbine with over-rating control

A method for controlling a wind turbine generator to generate power above a rated value, the method comprising:

• determining a first difference between a value of a first operating variable and a first set point;
• determining a second difference between a value of a second operating variable and a second set point;
• determining, based at least on the first difference and the second difference, an over-rated setting indicating an extent to which an operating characteristic of the wind turbine generator is to be over-rated between a maximum over-rated setting value and a minimum over-rated setting value, wherein the maximum over-rated setting value is equal to an over-rated setting of the wind turbine generator when the first operating variable is equal to the first set point;
• and
• controlling an over-rating setting of the wind turbine generator based on a minimum value selected from a first over-rated command value based on the first difference, and a second over-rated command value based on the second difference, wherein controlling the over-rating setting controls a power output of the wind turbine generator.

A wind turbine controller, comprising:

• a processor programmed to perform an operation for controlling a wind turbine generator to generate power above a rated value, the operation comprising:
• determining a difference between a value of a first operating variable and a first set point;
• determining, based at least one the difference, an over-rated setting indicating an extent to which an operating characteristic of the wind turbine generator is to be over-rated between a maximum over-rated setting value and a minimum over-rated setting value, wherein the maximum over-rated setting value is equal to an over-rated setting of the wind turbine generator when the first operating variable is equal to the first set point;
• outputting a first over-rating command value based on the difference;
• controlling the over-rating setting of the wind turbine generator based on the first over-rating command value, wherein controlling the over-rating setting controls a power output of the wind turbine generator;
• and
• incrementally reducing the over-rating setting to the minimum over-rated setting value based on the difference between the first operating variable and the first set point,
• wherein as the value of the first operating variable tends towards an alarm set point for the first operating variable, the minimum over-rated setting value is reached before the alarm set point is reached.

A non-transitory computer-readable medium executable on one or more wind turbine controllers to perform an operation for controlling a wind turbine generator to generate power above a rated value, the operation comprising:

• determining a difference between a value of a first operating variable and a first set point;
• determining, based at least on the difference, an over-rated setting indicating an extent to which an operating characteristic of the wind turbine generator is to be over-rated between a maximum over-rated setting value and a minimum over-rated setting value, wherein the maximum over-rated setting value is equal to an over-rated setting of the wind turbine generator when the first operating variable is equal to the first set point;
• outputting a first over-rating command value based on the difference;
• controlling the over-rating setting of the wind turbine generator based on the first over-rating command value, wherein controlling the over-rating setting controls a power output of the wind turbine generator;
• incrementally reducing the over-rating setting to the minimum over-rated setting based on the difference between the first operating variable and the first set point,
• wherein as the value of the first operating variable tends towards an alarm set point for the first operating variable, the minimum over-rated setting value is reached before the alarm set point is reached.