System for thrust-limiting of wind turbines

Control system for thrust-limiting of wind turbines, which wind turbine comprises at least one tower, which tower carries at least one nacelle which nacelle comprises a rotating shaft, which shaft is rotated by one or more blades, which blades are configured to be pitch regulated by a pitch control system, whereby the thrust-limiting control system performs control of the pitch angle, which thrust-limiting control system performs regulation of the pitch angle based on at least a first input from a wind estimator and a second input from a turbulence estimator, which first and second inputs are combined for forming an output which output is transmitted to a subtraction function where a signal representing the estimated thrust force is subtracted from the signal, which subtraction function generates a signal, which signal is sent through a post-processing function for generating a signal for performing thrust-limiting of the wind turbine, whereby the wind estimator receives a third input from measurement of inter-blade mean pitch angle, which wind estimator receives a fourth input from a generator torque reference set by a torque controller, which wind estimator receives a fifth input from a measured generator angular velocity, and whereby a sixth input to the wind estimator is derived from rotor inertia acceleration.

Control system for thrust-limiting of wind turbines, which wind turbine comprises at least one tower, which tower carries at least one nacelle which nacelle comprises a rotating shaft, which shaft is rotated by one or more blades, which blades are configured to be pitch regulated by a pitch control system, whereby the thrust-limiting control system performs control of the pitch angle, which thrust-limiting control system performs regulation of the pitch angle based on at least a first input from a wind estimator and a second input from a turbulence estimator, which first and second inputs are combined for forming an output which output is transmitted to a subtraction function where a signal representing the estimated thrust force is subtracted from the signal, which subtraction function generates a signal, which signal is sent through a post-processing function for generating a signal for performing thrust-limiting of the wind turbine, whereby the signal is transmitted to a PI control function, which PI control function further receives input from the output from the feed forward function, which PI control function further receives input from measurement of inter-blade mean pitch angle, which PI control function generates an output to which output the signal is added for forming a signal representing the minimal pitch angle.