Rotor control system for reducing structural vibrations based on m-blade transformation
AssigneeVestas Wind Systems A/S
InventorsJesper Sandberg THOMSEN, Keld HAMMERUM
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Abstract
The present invention relates to a rotor control system for actuating pitch of pitch adjustable rotor blades in order to reduce vibrations of a wind turbine element, e.g. tower vibrations. A pitch modification signal is determined which is based on an m-blade coordinate transformation, such as the Coleman transformation. The m-blade coordinate transformation taking as input a first signal and a second signal. The second signal is determined by filtering the first signal with a signal filter with a quadrature phase shift filter phase response.
Claims20
A rotor control system for actuating pitch of pitch adjustable rotor blades of a wind turbine comprising a tower, the rotor control system comprises a pitch actuating unit for determining a pitch modification signal to be applied to a pitch actuator for actuating the pitch of the pitch adjustable rotor blades based on a pitch actuation signal;
- wherein the pitch modification signal is based on an m-blade coordinate transformation, the m-blade coordinate transformation taking as input a first signal and a second signal;
- and
- wherein the second signal is determined by filtering the first signal with a signal filter with a quadrature phase shift filter phase response.
(canceled)
A method of actuating pitch of pitch adjustable rotor blades of a wind turbine, the method comprises:
- determining a pitch modification signal based on an m-blade coordinate transformation, the m-blade coordinate transformation taking as input a first signal and a second signal;
- wherein the second signal is determined by filtering the first signal with a signal filter with a quadrature phase shift filter phase response;
- and
- applying the pitch modification signal to a pitch actuator of the pitch adjustable rotor blades.
(canceled)
A wind turbine, comprising:
- a tower;
- a nacelle disposed on the tower;
- a rotor extending from the nacelle and having a plurality of blades disposed on a distal end thereof;
- and
- a rotor control system for actuating pitch of the plurality of blades;
- the rotor control system comprises a pitch actuating unit for determining a pitch modification signal to be applied to a pitch actuator for actuating the pitch of the pitch adjustable rotor blades based on a pitch actuation signal;
- wherein the pitch modification signal is based on an m-blade coordinate transformation, the m-blade coordinate transformation taking as input a first signal and a second signal;
- and
- wherein the second signal is determined by filtering the first signal with a signal filter with a quadrature phase shift filter phase response.
A computer program product, comprising software code which, when executed by a data processing system, performs an operation for actuating pitch of pitch adjustable rotor blades of a wind turbine;
- the operation, comprising:
- determining a pitch modification signal based on an m-blade coordinate transformation, the m-blade coordinate transformation taking as input a first signal and a second signal;
- wherein the second signal is determined by filtering the first signal with a signal filter with a quadrature phase shift filter phase response;
- and
- applying the pitch modification signal to a pitch actuator of the pitch adjustable rotor blades.
Dependencies are inferred from the claim text.