Variable pitch amplitude limiting method for independent variable pitch control of large wind generating set

Abstract

The invention discloses a variable pitch instruction amplitude limiting method for independent variable pitch control of a large wind generating set. For each blade of the wind generating set, the blade root waving load of the blade is sent to the two independent variable-pitch control loops to obtain respective independent variable-pitch instructions of the blade, and the processing frequency multiplication of the two independent variable-pitch control loops is different. And the paddle independent variable-pitch instructions, subjected to amplitude limiting in the dynamic amplitude limiting link, of the two independent variable-pitch control loops are added, then the corresponding concentrated variable-pitch angle from the concentrated variable-pitch control unit of the wind generating set is added, a paddle variable-pitch instruction is obtained, then the paddle variable-pitch instruction is sent to a paddle variable-pitch execution mechanism, and variable-pitch instruction amplitude limiting control is achieved. Under the condition that the variable pitch instruction does not exceed the saturation constraint of the variable pitch execution mechanism, the action freedom degree of the variable pitch execution mechanism is fully utilized, the performance of the independent variable pitch control system is guaranteed, and the influence of amplitude limiting on unit rotating speed control is basically avoided.

Description

technical field [0001] The present invention relates to an independent pitch control method in the field of control of large-scale wind power generators, in particular to an indirect dynamic limiting method for pitch commands applied in the independent pitch control of large wind power generators. Background technique [0002] The large-scale single unit capacity of wind turbines has made the size of key components such as the diameter of the wind rotor, the height of the hub, and the radius of the tower increasingly larger, resulting in smaller damping and greater flexibility of key components such as the wind rotor, tower, and bearings. . In addition, wind turbines are also affected by factors such as wind turbulence, wind shear, and tower shadow effects during operation. The combination of these factors makes the change of dynamic loads suffered by wind turbines more complicated, and poses a threat to the operation of wind turbines. Reliability and operating life present...

AI Technical Summary

Problems solved by technology

However, it will inevitably bring about the problem that it is difficult to select the limit value of the pitch command

If the limit value is too large, the pitch command will exceed and the pitch actuator will enter the saturation zone; if the limit value is too small, the degree of freedom of the pitch actuator will be wasted and the independent pitch will be reduced. Control effect

[0004] At present, there is no dynamic limiting method involving independent pitch control in the domestic wind turbine control field

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