Variable pitch control system, variable pitch control method and wind generating set

Abstract

The invention discloses a variable pitch control system, a variable pitch control method and a wind generating set. The variable pitch control system comprises a main controller, a variable pitch frequency converter component, variable pitch motors, variable pitch reducers and variable pitch bearings, wherein one variable pitch bearing corresponds to each blade; the plurality of variable pitch reducers are respectively driven by a plurality of variable pitch motor shafts; the plurality of variable pitch reducers are respectively meshed with one variable pitch bearing so as to drive the variable pitch bearing to rotate; and the variable pitch frequency converter component which corresponds to each blade comprises a plurality of frequency converters which comprise a master frequency converter and the rest of slave frequency converters and respectively drive the plurality of variable pitch motors. The variable pitch control on blades of a large or an extra-large wind generating set is realized on the basis of not adding electric and mechanical loads of the variable pitch motors and the variable pitch reducers.

Description

technical field [0001] The present invention relates to the pitch technology, in particular to a pitch control system, a pitch control method and a wind power generating set. Background technique [0002] Wind power converts the kinetic energy of the air into mechanical energy and then into electrical energy. It is currently the fastest-growing and most potential development direction in the field of new energy development. However, wind energy, as an intermittent energy source, has great randomness and uncontrollability. [0003] The output power of wind turbines usually fluctuates in a large range. Usually, the pitch angle of the blades on the hub is adjusted through the pitch control system, and the pitch angle is adjusted at any time according to the change of wind speed to control the wind energy absorbed by the wind turbine, thereby improving the overall wind power generation. The efficiency of the unit can keep the power and speed of the wind turbine stable, and can ...

AI Technical Summary

Problems solved by technology

[0006] For the pitch change of a blade of a large or super-large wind turbine, it is difficult to achieve effective and fast pitch change with a single pitch motor and pitch reducer, and the development and manufacture of its corresponding electrical and mechanical components is also difficult. There are certain difficulties, which not only make the selection and installation of the pitch motor difficult, but also the maintenance in the future is also difficult, which is not conducive to the development of large or super large wind turbines

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