Additional proportional incremental PID control method for propeller pitch controller of wind generating set

Abstract

The invention discloses an additional proportional incremental PID control method for a propeller pitch controller of a wind generating set. The method comprises the following steps of 1) setting required parameters according to the specification of the wind generating set and a wind field environment where the wind generating set is located, 2) detecting the angular velocity omega of the generator, and performing filtering processing to obtain a filtering angular velocity omegafilter, (3) taking the difference value between the filtering angular velocity omegafilter and the reference angular velocity omegareference of the generator as the adjustment deviation value eomega of the angular speed of the generator, taking the difference value of eomega of two adjacent periods as the angular velocity regulating variable deltaeomega of the generator, 4) deriving the filtering angular velocity omegafilter to obtain the acceleration aomega of the angular velocity, 5) judging whether to start additional proportional control or not, and judging whether to quit the control or not by adopting a hysteresis value, 6) calculating additional proportional gain KGain in a segmented manner, 7) calculating an additional proportional adjustment value PAdditional, 8) obtaining a total regulating variable deltau(t) through an incremental PID algorithm, 9) carrying out amplitude limiting processing on the regulating variable deltau(t), and 10) adding the system output of the previous sampling period and the deltau(t) in the step (9) to serve as the total system output u(t).

Description

technical field [0001] The invention relates to the technical field of wind power generation control, in particular to an additional proportional term incremental PID control method for a pitch controller of a wind power generating set. Background technique [0002] As the competition in the wind power generation market intensifies, reducing the design and manufacturing costs of wind power generating sets has become the primary task faced by major complete machine manufacturers on the premise of ensuring quality. [0003] Under the pressure of fierce competition, the development of wind turbines in low wind speed and ultra-low wind speed areas has become another point of competition for complete machine manufacturers. In order to adapt to the change of wind speed in the wind area, the diameter of the rotor of the wind turbine has been continuously lengthened, resulting in a substantial increase in the inertia of the rotor of the wind turbine. Once the wind turbine encounter...

AI Technical Summary

Problems solved by technology

In order to adapt to the change of wind speed in the wind area, the diameter of the wind rotor of the wind turbine is continuously lengthened, resulting in a significant increase in the inertia of the wind rotor of the wind turbine

Once the wind turbine encounters extreme wind conditions, the wind speed and direction will change greatly in a short period of time. If only relying on the conventional PID adjustment of the pitch, it is easy to cause the unit to stop at overspeed, and there is a large yaw error angle in this working condition. During the shutdown process, there may be an extreme load situation where the hub and yaw are unbalanced, and major safety accidents are likely to occur

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