A method of pitch control for wind turbines

Abstract

The invention discloses a variable pitch control method of a wind generating set. The method includes the steps: acquiring real-time rotating speed of a wind wheel and real-time pitch angles of bladesof the wind generating set; calculating variable pitch speed of the blades by a proportional differential control algorithm according to the real-time rotating speed and the real-time pitch angles; controlling variable pitch rotation of the blades according to the variable pitch speed. Compared with a traditional proportional integral control algorithm, the pitch angles cannot be converted into the variable pitch speed, the variable pitch speed is directly acquired, so that delay and indeterminacy increased by a converting link are avoided, tracking of a system is accelerated, the dynamic response capability of a variable pitch system of the wind generating set is improved, the method solves the problem of excessive speed of the wind generating set under gale and strong turbulence, so that generation of an extreme load is avoided, fatigue damage to the wind generating set is reduced, and availability and the generating capacity of the wind generating set are improved.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a pitch control method of a wind power generating set. Background technique [0002] Wind turbines have the advantages of cleanliness and high efficiency, and are widely used in the field of power generation. In order to adapt to different wind forces, it is necessary to control the pitch of its blades, that is, to change the angle of attack of the blades. In the prior art, the pitch control mostly takes the wind rotor speed as the input and the pitch angle as the output. The traditional control calculation method, that is, according to the real-time speed of the wind rotor, the pitch angle is obtained through the proportional integral control algorithm, and then the pitch angle is obtained by the pitch angle. The actuator realizes the tracking of the pitch angle, controls the blades to rotate to the obtained pitch angle, and then realizes the control of the speed of the win...

AI Technical Summary

Problems solved by technology

[0003] However, with the increase of the single unit capacity of the wind turbine and the lengthening of the wind rotor blades, the moment of inertia of the wind rotor increases and the lag time of the wind rotor speed control prolongs.

The traditional proportional-integral control is prone to overspeed and extreme loads in wind conditions where the wind speed changes rapidly

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