Pitch angle detecting device of variable-pitch variable-speed wind generating set

Abstract

The invention relates to a wind generating set, in particular to a pitch angle detecting device of a variable-pitch variable-speed wind generating set. An incremental coder is arranged on an output shaft of a variable-pitch motor, the output of the incremental coder is connected with a variable-pitch control system; a maximum pitch angle position correcting switch, a minimum pitch angle position correcting switch, a maximum pitch angle position limit switch and a minimum pitch angle position limit switch are arranged aside a variable-pitch rotating shaft; output signals of all correcting switches and limit switches are connected with the variable-pitch control system so that the installation is simple and the cost of the pitch angle detecting device is reduced by 50 percent; and the minimum pitch angle position limit switch is added so as to improve reliability and authenticity of pitch angle detection of the wind generating set and security of set operation. The invention provides correct pitch angle information of vanes for a control system of the wind generating set, thereby improving efficiency for capturing the wind energy by the set and obtaining optimal electric energy output.

Description

Technical field [0001] The invention relates to a wind power generating set, in particular to a pitch angle detection device for a variable pitch and variable speed wind power generating set. Background technique [0002] At present, in the electric drive pitch system of the grid-connected variable-speed wind turbine generator set in China, the pitch angle detection device mainly adopts the structure form of incremental encoder, absolute encoder and maximum pitch angle position limit switch connected in sequence. constitute. The incremental encoder is installed at the end of the drive motor shaft to detect the increment of the pitch angle; the absolute encoder is connected with the inner gear ring of the pitch slewing bearing through a pinion gear to detect the pitch The absolute position of the angle. The confirmation of the pitch angle is to calculate the pitch angle based on the increment of the pitch angle detected by the incremental encoder, and then compare it with the ab...

AI Technical Summary

Problems solved by technology

[0003] At present, the pitch angle detection device with the structural form of incremental encoder, absolute encoder, and maximum pitch angle position limit switch is used. Since the absolute encoder is used, the absolute encoder is a multi-turn Rotary type, its price is high, it is connected with the internal ring gear of the variable pitch slewing bearing through the pinion gear during installation, the installation structure is complicated, and there is no minimum position limit protection switch, the unit has potential safety hazards

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