Wind driven generator pitch angle control method, system and device and readable storage medium

Abstract

The invention discloses a wind driven generator pitch angle control method, system and device and a computer readable storage medium. The method comprises the steps that the effective wind speed of awind driven generator at present is obtained; the effective wind speed predicted value in the next unit time is obtained through the effective wind speed and a preset effective wind speed prediction model; the feedforward pitch angle is obtained through the effective wind speed predicted value, the preset lookup algorithm and the preset steady pitch angle corresponding relation table; and throughthe feedforward pitch angle, the pitch angle of the wind driven generator is adjusted. According to the method, the effective wind speed predicted value of the current effective wind speed e in the next unit time is predicted in advance, through the effective wind speed predicted value, the feedforward pitch angle is looked up and worked out in the preset steady pitch angle corresponding relationtable, the pitch angle of the wind driven generator is adjusted, the pitch is changed in advance, the pitch change time is prolonged, the change rate is not too large, resistance of wind force to pitch change is reduced, the load of a pitch system is decreased, and the service life of the pitch system is prolonged.

Description

technical field [0001] The present invention relates to the technical field of control of wind power generators, in particular to a method, system, device and computer-readable storage medium for controlling the pitch angle of wind power generators. Background technique [0002] As we all know, wind power has developed into the most widely used new energy power generation technology, and it is an important way for countries all over the world to cope with energy crisis and climate change. Optimal control of wind turbines is still a challenging subject. [0003] In the early small wind turbines, the passive stall method was often adopted. By changing the pitch angle of the nacelle, the angle of attack of the wind acting on the blades was changed, so that the turbine entered the stall zone, thereby realizing the constant power control of the wind turbine. This method does not need to add additional actuators, and is simple to implement and low in cost. However, since the pass...

AI Technical Summary

Problems solved by technology

[0005] There are mainly two ways to realize the pitch angle control of modern units: unified pitch and independent pitch. In the above two pitch control methods, the commonly used control strategies include: PID, variable gain PID, robust controller, Adaptive controller, fuzzy logic controller, etc. However, these controllers are designed based on the idea of ​​state feedback. Compared with the input wind speed of the system, the system state (including speed, power, etc.) obtained by feedback has delay characteristics , that is to say, the feedback pitch angle controller will only produce the control effect after the feedback error occurs. Therefore, in order to obtain a better speed and power adjustment effect, this kind of post-control will often lead to an increase in the load of the pitch system, and then Increased failure rate of the pitch system, shortening its service life

Images