Bang-Bang Controller and Control Method For Variable Speed Wind Turbines During Abnormal Frequency Conditions
First Claim
1. A wind farm comprising:
- a plurality of variable speed wind turbines; and
a centralized controller configured to selectively adjust a respective electrical output power from each of the wind turbines at least during an underfrequency condition, the controller including a monitor configured to monitor a grid frequency value relative to at least a first threshold value, wherein a deviation of the grid frequency value beyond the first threshold value is indicative of the underfrequency condition, the controller further including a control unit configured to effect a step response to the electrical output power of the wind turbine in a direction selected to counteract the underfrequency condition, whereby kinetic energy stored in a rotating shaft of the wind turbine is extracted to effect the step response to the electrical output power of the wind turbine.
3 Assignments
0 Petitions
Accused Products
Abstract
A wind farm (10) may include a plurality of variable speed wind turbines (12, 14, 16). A centralized controller (50) may be configured to selectively adjust a respective electrical output power from each of the wind turbines at least during an underfrequency condition. The controller may include a monitor (52) configured to monitor a grid frequency value relative to at least a first threshold value. A deviation of the grid frequency value beyond the first threshold value is indicative of the underfrequency condition. The controller further includes a control unit (54) configured to effect a step response to the electrical output power of the wind turbine in a direction selected to counteract the underfrequency condition.
-
Citations
25 Claims
-
1. A wind farm comprising:
-
a plurality of variable speed wind turbines; and a centralized controller configured to selectively adjust a respective electrical output power from each of the wind turbines at least during an underfrequency condition, the controller including a monitor configured to monitor a grid frequency value relative to at least a first threshold value, wherein a deviation of the grid frequency value beyond the first threshold value is indicative of the underfrequency condition, the controller further including a control unit configured to effect a step response to the electrical output power of the wind turbine in a direction selected to counteract the underfrequency condition, whereby kinetic energy stored in a rotating shaft of the wind turbine is extracted to effect the step response to the electrical output power of the wind turbine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A variable speed wind turbine comprising:
a controller coupled to the variable speed wind turbine, the controller configured to adjust an electrical output power from the wind turbine at least during an underfrequency condition, the controller including a monitor configured to monitor a grid frequency value relative to at least a first threshold value, wherein a deviation of the grid frequency value beyond the first threshold value is indicative of the underfrequency condition, the controller further including a control unit configured to effect a step response to the electrical output power of the wind turbine in a direction selected to counteract the underfrequency condition, whereby kinetic energy stored in a rotating shaft of the wind turbine is extracted to effect the step response to the electrical output power of the wind turbine. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
17. A method for controlling a variable speed wind turbine, the method comprising:
-
monitoring a grid frequency value relative to at least one threshold value, wherein a deviation of the grid frequency value beyond the at least one threshold value is indicative of an underfrequency condition; and adjusting an electrical output power from the wind turbine at least during the underfrequency condition, the adjusting configured to cause a step response to the electrical output power of the wind turbine in a direction selected to counteract the underfrequency condition, whereby kinetic energy stored in a rotating shaft of the wind turbine is extracted to provide the step response to the electrical output power of the wind turbine. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
-
25. A bang-bang controller configured to adjust an electrical output power from a variable speed wind turbine at least during an underfrequency condition, the controller comprising:
-
a monitor configured to monitor a grid frequency value relative to at least a first threshold value, wherein a deviation of the grid frequency value beyond the first threshold value is indicative of the underfrequency condition; and a control unit configured to effect a step response to the electrical output power of the wind turbine in a direction selected to counteract the underfrequency condition, wherein the effected step response is performed by the control unit without evaluating at least one of the following;
a rate of change of the deviation, an integral of the deviation and/or a magnitude of the deviation, whereby kinetic energy stored in a rotating shaft of the wind turbine is extracted to effect the step response to the electrical output power of the wind turbine.
-
Specification