A Method for Realizing Maximum Power Point Tracking of Wind Turbines

Abstract

The invention discloses a method for achieving maximum power point tracing of a wind generation set based on a wind speed feedforward hill climbing algorithm. The method comprises the steps that 1, initialization is carried out; 2, kth signal collection is carried out; 3, the given rotating speed omega ref is made to be equal to omega ref+ delta omega ref; 4, (k+1)th signal collection is carried out, and the variable quantity is obtained; 5, whether feedforward control is started or not is judged according to the variable quantity of the wind speed; 6, the feedforward control quantity is obtained according to a wind speed feedforward coefficient; 7, whether the rotating speed disturbing quantity is zero or not is judged, if yes, the twelfth step is executed, and if not, the eighth step is carried out; 8, whether the change rate of power relative to the rotating speed is smaller than e or not is judged, if yes, the fourteenth step is executed, and if not, the ninth step is executed; 9, the step size adjusting coefficient kt is set to be equal to b; 10, the disturbing step size in search at the moment of (k+1)T is obtained; 11, k is made to be equal to k+1, and the second step is executed; 12, whether the variable quantity of the power is larger than a restarting threshold value epsilon or not is judged, if yes, the thirteenth step is executed, and if not, the fourteenth step is executed; 13, the initial disturbing step size generated after restarting is obtained, and the eleventh step is executed; and 14, the step size adjusting coefficient kt is set to be equal to 0, and the tenth step is executed.

Description

technical field [0001] The invention belongs to the technical field of wind power operation control, and more specifically relates to a method for tracking the maximum power point of a wind turbine based on a wind speed feedforward hill-climbing algorithm. Background technique [0002] With the increasing installed capacity of wind power, how to safely and efficiently convert wind energy into electrical energy is a hot issue in current wind power research. Wind turbines have different maximum power points at different wind speeds. How to efficiently, stably and quickly capture wind energy and realize maximum power point tracking (MPPT) is the main technical means to reduce wind curtailment. [0003] In the power-speed characteristic curve of the wind turbine, each wind speed uniquely corresponds to a single peak curve. It can be seen from the curve that at a fixed wind speed, on the left side of the maximum power point, the power increases monotonously with the increase of ...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defects of the existing variable step-length climbing method, the present invention provides a wind turbine maximum power point tracking method based on the wind speed feedforward mountain climbing algorithm. The method uses the wind speed change rate as the feedforward control amount instead of directly using the wind speed itself. Therefore, it does not depend on the accurate measurement of wind speed, avoiding the adverse effect on control accuracy due to inaccurate wind speed measurement

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