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1. (WO2019050860) VARIABLE SPEED CONTROL OF WIND TURBINE GENERATOR BASED ON ESTIMATED TORQUE
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CLAIMS

1. A system for controlling a wind turbine generator, the system comprising:

a rotor blade assembly including rotor blades and a pitch actuator to control a pitch of the rotor blades;

a power generator coupled to the rotor blade assembly;

a main controller coupled to the rotor blade assembly and the power generator, the main controller being configured to control the aerodynamic torque applied on the rotor blades based on pitch control commands, and separately configured to control a generator speed of the power generator based on torque control commands;

a pitch controller coupled to the main controller, the pitch controller being configured to receive pitch calculation information from the main controller, calculate the pitch control commands, and return the pitch control commands to the main controller; and

a torque controller coupled to the main controller, the torque controller being configured to receive torque calculation information from the main controller, calculate the torque control commands, and return torque control commands to the main controller.

2. The system of claim 1, wherein the main controller is configured to decouple the pitch control commands from the torque control commands.

3. The system of claim 1, wherein the pitch calculation information includes at least a wind speed, and an actual rotor speed.

4. The system of claim 3, wherein calculating the pitch control commands involves receiving the pitch calculation information to determine an estimated aerodynamic torque.

5. The system of claim 4, wherein calculating the estimated aerodynamic torque involves using an estimated low-speed shaft torque.

6. The system of claim 1, wherein calculating the pitch control commands includes utilizing PID control.

7. The system of claim 1, wherein the pitch controller recursively determines the pitch control commands by comparing an estimated aerodynamic torque and an aerodynamic torque set point.

8. The system of claim 1, further comprising a gear box coupled to the rotor blade assembly and the power generator, wherein the torque calculation information includes at least one of a wind speed, an actual electrical torque, an actual generator speed, a gear box loss table, and an actual rotor speed.

9. The system of claim 8, wherein calculating the torque control commands involves receiving the torque calculation information to determine an estimated high-speed shaft torque.

10. The system of claim 1, wherein calculating the torque control commands includes utilizing PID control.

11. The system of claim 1, wherein a minimal torque value is determined using an actual generator speed and an optimal gain.

12. The system of claim 1, wherein the torque controller recursively determines the torque control commands by comparing an actual generator speed and a generator speed set point.

13. A method of controlling a wind turbine generator, the method comprising:

controlling an aerodynamic torque applied on rotor blades based on pitch control commands;

separately controlling a generator speed of a power generator based on torque control commands;

receiving pitch calculation information from the main controller, calculating the pitch control commands, and returning the pitch control commands to the main controller; and

receiving torque calculation information from the main controller, calculating the torque control commands, and returning torque control commands to the main controller.

14. The method of claim 13, wherein the torque control commands are parabolic when the generator speed reaches a set cut-in wind speed, and last until the generator speed reaches a maximum value.

15. The method of claim 13, wherein the torque control commands are PID controls when the generator speed reaches the maximum value, and last until a rated wind speed level is met.

16. The method of claim 13, wherein the pitch control commands are set to a constant angle, and last until the rated wind speed level is met.

17. The method of claim 13, wherein the pitch control commands are PID controls when the rated wind speed level is met.

18. A control for controlling a wind turbine generator, the control comprising:

a main supervisory system configured to manipulate a pitch angle of rotor blades of the wind turbine based on pitch control commands, and separately configured to regulate a generator speed of a power generator of the wind turbine based on torque control commands;

a pitch controller coupled to the main supervisory system, the pitch controller being configured to receive pitch calculation information from the main controller, calculate the pitch control commands, and return the pitch control commands to the main controller; and

a torque controller coupled to the main supervisory system, the torque controller being configured to receive torque calculation information from the main controller, calculate the torque control commands, and return torque control commands to the main controller.

19. The control of claim 18, wherein the main supervisory system is configured to decouple the pitch control commands from the torque control commands.

20. The control of claim 19, wherein the pitch calculation information includes at least a wind speed, and an actual rotor speed, wherein calculating the pitch control commands involves receiving the pitch calculation information to determine an estimated aerodynamic torque, and wherein calculating the estimated aerodynamic torque involves using an estimated low-speed shaft torque.