System for measuring azimuth angle of wind wheel of wind driven generator

Abstract

Disclosed is a system for measuring the azimuth angle of a wind wheel of a wind driven generator. The system comprises a rotating speed measuring device, a zero position detection device and a controller. The rotating speed measuring device is used for detecting the rotating speed of a driving shaft. The zero position detection device outputs a first switching value signal when the gauge point of the driving shaft rotates to the predetermined position. The controller controls the rotating speed measuring device to detect the rotating speed of the driving shaft according to the preset time interval, the value of the rotating angle of the driving shaft at the preset time interval is calculated according to the rotating speed of the driving shaft, the calculated values of the rotating angles of the driving shaft at the preset time intervals are accumulated one by one to obtain an accumulated value, the accumulated value serves as the azimuth angle of the wind wheel, and the controller enables the accumulated value to be reset when receiving the first switching value signal outputted by the zero position detection device. The system for measuring the azimuth angle of the wind wheel of the wind driven generator can accomplish measurement of the azimuth angle of the wind wheel by being free of utilization of a large-diameter metal rotary table, has the high real-time performance, the high accuracy and the high continuity, and can eliminate accumulated errors.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, in particular to a measurement system for the azimuth angle of a wind rotor of a wind power generator. Background technique [0002] Most of the wind rotors of wind turbines use three-blade wind rotors, and the three blades are connected to the hub through rotatable thrust bearings or slewing support devices specially designed for pitch control mechanisms. During the operation of the three-blade wind wheel, the pitch angle of the wind to the blades can be adjusted by driving the pitch-variable mechanism according to the change of wind speed. [0003] At present, there are mainly two control methods for the pitch mechanism of wind turbines: unified pitch control and independent pitch control. Among them, the independent pitch control can make full use of the difference in the distribution of wind energy on each blade, and effectively adjust the pitch angle of each blade respectively...

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned method for measuring the azimuth angle of the wind rotor of the wind turbine has the following defects: first, the measurement accuracy is low. Assuming that the number of holes on the metal rotating disk is 24, the highest measurement accuracy is 360° / 24=15 °, that is, each time the angle value changes to 15°, for example, the azimuth angle of the wind wheel for three consecutive times is 0°, 15°, 30°; For normal response triggering, the diameter of the metal turntable needs to be designed to be larger, which leads to a larger mass of the metal turntable, and to install a metal turntable with a larger mass on the low-speed shaft, on the one hand, it is necessary to change the structure of the low-speed shaft, which leads to the low-speed shaft. The structure is relatively complicated, on the other hand, the load on the low-speed shaft is increased, which is not conducive to the stable operation of the low-speed shaft

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