POWER OSCILLATION DAMPING CONTROLLER

• US 20130175871A1
• Filed: 06/10/2011
• Published: 07/11/2013
• Est. Priority Date: 09/28/2010
• Status: Active Grant

• Current Assignee: Innomotics GmbH
• Original Assignee: Thyge Knuppel
• Inventors: Kumar, Sathees, Thuring, Patrik, Knppel, Thyge
• Granted Patent: US 9,528,499 B2
• Time in Patent Office: Days
• US Class Current: 307/102
• CPC Class Codes: F03D 9/257 the wind motor being part of a wind farm
• CPC Class Codes: H02J 2300/22 The renewable source being solar energy
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/241 The oscillation concerning frequency
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/48 Controlling the sharing of the in-phase component
• CPC Class Codes: H02J 3/50 Controlling the sharing of the out-of-phase component
• CPC Class Codes: H02P 9/02 Details
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects

Abstract

A power oscillation damping controller is provided for a power generation device such as a wind turbine device. The power oscillation damping controller receives an oscillation indicating signal indicative of a power oscillation in an electricity network and provides an oscillation damping control signal in response to the oscillation indicating signal, by processing the oscillation damping control signal in a signal processing chain. The signal processing chain includes a filter configured for passing only signals within a predetermined frequency range.

Claims

1-15. -15. (canceled)

16. A controller for a power generation device of a power generation park, the power generation park having a common point of coupling by which the power generation devices of the power generation park are coupled to an electricity network, the controller comprising:

an input for receiving an oscillation indicating signal indicative of a power oscillation in the electricity network;

an output for providing an oscillation damping control signal in response to the oscillation indicating signal;

a signal processing chain between the input and the output, the signal processing chain comprising a filter configured for passing only signals within a predetermined frequency range;

the signal processing chain further comprising;

a phase adjustment unit configured for providing a phase difference between the oscillation indicating signal and the oscillation damping control signal, the phase difference provided by the phase adjustment unit being dependent on a distance of the power generation device from the point of common coupling.

17. The controller as set forth in claim 16, wherein the signal processing chain further comprises:

a phase shifting unit for providing a phase difference between the oscillation indicating signal and the oscillation damping control signal.

18. The controller as set forth in claim 16, wherein signal processing chain further comprises:

a limiting unit configured for maintaining the oscillation damping control signal within predetermined limits.

19. The controller as set forth in claim 16, wherein the signal processing chain further comprises:

a delay compensation unit for compensating a delay with which the oscillation indicating signal is received.

20. The controller as set forth in claim 16, wherein the power generation device is a wind turbine device, the signal processing chain further comprising a notch filter for filtering out frequencies which excite mechanical resonance frequencies in the wind turbine device.

21. The controller as set forth in claim 16, further comprising;

the signal processing chain as a first signal processing chain;

the output as a first output;

the oscillation damping control signal being a first oscillation damping control signal configured for controlling an active power provided by the power generation device;

a second output;

a second signal processing chain between the input and the second output;

the second signal processing chain being configured for providing a second oscillation damping control signal for controlling a reactive power provided by the power generation device.

22. The controller as set forth in claim 21, further comprising:

a weighting unit;

the weighting unit being configured for setting, in response to a weighting signal, a magnitude of the first oscillation damping control signal and/or a magnitude of the second oscillation damping control signal.

23. A control system for controlling a power generation device, the control system comprising:

a controller as set forth in claim 16; and

a system output for providing a control signal for the power generation device.

24. The control system according to claim 23, further comprising:

a further controller for providing a further control signal; and

a summing unit for summing the damping control signal and the further control signal.

25. A method of operating a controller for a power generation device of a power generation park, the power generation park having a point of common coupling by which the power generation devices of the power generation park are coupled to an electricity network, the method comprising:

receiving an oscillation indicating signal indicative of a power oscillation in the electricity network;

passing said oscillation indicating signal through a signal processing chain thereby providing an oscillation damping control signal in response to the oscillation indicating signal;

wherein passing said oscillation indicating signal through a signal processing chain comprises passing only signals within a predetermined frequency range;

the method further comprising;

providing a phase difference between the oscillation indicating signal and the oscillation damping control signal, the phase difference being dependent on a distance of the power generation device from the point of common coupling.