Variable pitch control method for large-sized wind-driven generator group

Abstract

The invention provides a propeller pitch variation control method for a large-sized wind powered generator unit. The method comprises the following steps: a rotating speed error delta omega is obtained by subtracting the practical rotating speed omega practice of a current main bearing by the rotating speed expected value omega expectation of the current main bearing, a corresponding propeller pitch angle reference value beta reference is calculated by integrating a rotating speed difference delta omega and the variation tendency by a fuzzy controller, the propeller pitch angle reference value beta reference is transmitted to the wind powered generator unit which realizes the control of the propeller pitch angle for a propeller pitch variable actuating mechanism, and the pneumatic shape of a changed propeller pitch angle blade is changed so as to enable the bearing force of the changed propeller pitch angle blade to be changed and the rotating speed of the wind powered generator unit to trace the rotating speed expected value omega expectation. The propeller pitch variation control method obviously enhances the total precision, is favorable to increasing the annual total generated energy of the wind powered generator unit, has high adaptability for complex and extreme cases, greatly enhances the operating effectiveness, furthest prolongs the mechanical life of the propeller pitch variable actuating mechanism, and also has low remodel difficulty and low cost.

Description

technical field [0001] The present invention relates to a pitch control method of a large wind power generating set, in particular to a pitch control method of a large wind generating set whose basic purpose is to control the rotational speed of a main shaft. Background technique [0002] Stall wind turbines and pitch wind turbines are the two main types of large wind turbines. The blades of the unit using the stall power regulation method cannot rotate during power generation, and the speed adjustment is realized through the stall characteristics of the stall-type blades themselves. This method has the advantages of simple structure and low failure probability. Its disadvantage is mainly that the performance of the wind turbine is limited by the stall performance of the blades, and the generated power decreases when the wind speed exceeds the rated value. Another disadvantage is that the shape and structure of the blades are complex and heavy, which makes the moment of ine...

AI Technical Summary

Problems solved by technology

[0005] Nowadays, the control method of variable pitch generally adopts "proportional integral" control. Although this method is simple and practical, it has insurmountable problems such as difficulty in improving control accuracy, obvious decline in complex situations, and too frequent work is not conducive to the life of mechanical components.

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