Method and system for controlling pitch angle of wind generating set under strong wind conditions and equipment

Abstract

The invention discloses a method and system for controlling a pitch angle of a wind generating set under strong wind conditions and equipment and belongs to the field of wind power generation. Whether variable pitch control parameters of the wind generating set need to be adjusted or not is judged by detecting operation parameters of a generator, if the variable pitch control parameters exceed a design threshold, another set of independently set control loop PID parameters are started, the sensitive period of different pneumatic torques to the pitch angle under different operating parameters is considered to the maximum extent, and the variable pitch action response of the set to different operating parameters under different wind conditions is improved. After the operation parameters of a generator are judged to exceed the threshold value, a time accumulation mode is innovatively introduced, the control loop PID parameter under the higher operation parameters can be used only when the time accumulation threshold value is exceeded, and frequent switching of PID parameter setting due to frequent operation parameter changing is avoided. Thus, the operation parameters of the wind generating set can be better controlled to meet the requirements of different operation parameters on different variable pitch action responses.

Description

technical field [0001] The invention belongs to the field of wind power generation, and relates to a method, system and equipment for controlling the pitch angle of a wind turbine under strong wind conditions. Background technique [0002] Wind turbines have different pitch control strategies at different wind speeds. After reaching the rated wind speed, the generator speed is also constantly changing due to the continuous fluctuation of wind speed. At this time, it is necessary to control the generator speed by pitch control. The set point is the target, and the pitch angle positions of the three blades are constantly adjusted to control the absorbed wind energy to achieve the control target. The pitch control algorithm generally takes the speed difference as the control input, and uses the classic PID control algorithm to calculate the corresponding pitch angle. Since the sensitivity of the aerodynamic torque to the pitch angle is different under different wind speeds, th...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the above-mentioned prior art that the control strategy uses the state of the unit such as the rotational speed as the judgment condition, resulting in a relatively low control effect, and to provide a method, system and equipment for controlling the pitch angle of the wind turbine under strong wind conditions

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