Wind speed feedforward and fuzzy PID combined variable-pitch control method

Abstract

The invention provides a wind speed feedforward and fuzzy PID combined variable-pitch control method. The control method is characterized in that when a power error is relatively large, a fuzzy controller is adopted, and a PID controller is adopted when the power error is relatively small. The control method simultaneously utilizes the characteristics of the rapidity of the fuzzy controller and the precision of the PID controller, and a soft switch mode is adopted in the process of switching between the fuzzy controller and the PID controller. According to the wind speed feedforward and fuzzyPID combined variable-pitch control method, a smoothing function is adopted, and the output proportion of the fuzzy controller and the output proportion of the PID controller are adjusted in real timeaccording to the magnitude of the power error, so that the problem of discontinuous output caused by direct switching between the controllers is solved, and the output stability of a system is effectively maintained; and meanwhile, feedforward adjustment of a pitch angle is performed in real time through the measured wind speed, so that a proper feedforward pitch angle can be given according to the characteristics of the wind speed, and the response characteristic of the system is improved.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a pitch control method combining wind speed feedforward and fuzzy PID. Background technique [0002] As more and more countries begin to actively reduce emissions, wind power is valued by more and more countries. In order to ensure the safe and stable operation of the wind turbine above the rated wind speed, the power absorbed by the wind turbine is usually limited by changing the pitch, that is, the wind energy utilization coefficient of the wind turbine is changed by changing the pitch angle, so that the wind turbine’s The output power is near the rated value. [0003] It is difficult for the traditional PID control technology to achieve better control effect in the wind turbine with large inertia and strong coupling. Switching between the fuzzy controller and the PID controller through the error threshold is a commonly used method. When the error is greater than the set ...

AI Technical Summary

Problems solved by technology

In this control method, directly switching the controller at the switching point will lead to discontinuous output of the pitch angle, causing oscillation problems to the system, and cannot effectively maintain the stability of the output power of the wind turbine

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