Individual variable pitch control method for wind generating set applicable to no-load measurement

Abstract

The invention discloses an individual variable pitch control method for a wind generating set applicable to no-load measurement, and belongs to the technical field of wind generating variable pitch control. The method comprises the following steps: (1) correcting and measuring wind speed by using a method of combining theoretical correction and error identification; (2) calculating a blade load prediction value under the influence of wind shear and tower shadow effects; (3) allocating and calculating individual variable pitch control pitch angles. According to the method, load control can be performed through individual variable pitch without arrangement of a blade load sensor, so that the service life of the wind generating set is prolonged, and the failure rate is reduced; during load calculation, the wind speed correction, the wind shear effect and the tower shadow effect are taken into consideration, so that the load calculation is more accurate; according to the variable pitch speed and frequency of a variable pitch execution mechanism, a pitch angle allocation method is provided, so that the rapidity and real-time performance of control are ensured; each blade pitch angle is obtained by summing pitch angle control quantity and load optimal compensation quantity which are output by a unified variable pitch controller through load prediction, so that the power control is ensured, and meanwhile, the load control is realized.

Description

technical field [0001] The invention belongs to the technical field of pitch control for wind power generation, in particular to an independent pitch control method for wind turbines suitable for no-load measurement. Background technique [0002] Due to the continuous development of large-scale wind turbines, the height of the tower and the diameter of the wind rotor have also increased. The existence of wind turbulence, wind shear, tower shadow and other effects have significantly increased the difference in wind speed in the entire blade sweep plane, which not only It affects the control effect of unified pitch, and the inconsistent wind speed everywhere will inevitably cause unbalanced load on the wind wheel. The unbalanced load on the impeller will cause a large fatigue load on the key components of the wind turbine such as pitch bearings, hubs, main shafts, yaw bearings, and towers. The stability of unit operation and fatigue life have a direct adverse effect. The ind...

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Problems solved by technology

[0009] The above distribution methods do not consider the pitch rate limit of the pitch actuator, which also makes the simulation effect of many control strategies difficult to achieve in practice

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