A control method for wind turbines based on wind rotor thrust estimation

Abstract

The invention discloses a wind wheel thrust estimation-based control algorithm for a wind power generation unit. Firstly, the wind speed at an impeller of a wind power generator, the blade pitch angle, the azimuth angle and the rotating speed of the wind power generator are measured by the aid of sensors in real time; then acquired data are combined with blade aerodynamic data, and wind wheel thrust applied to the impeller at different moments is estimated through a blade element momentum theory; according to the magnitude of the estimated wind wheel thrust, the corresponding minimum pitch angle is obtained through a look-up table method, the minimum pitch angle value is input into a variable-pitch controller and is compared with the minimum pitch angle value set by the variable-pitch controller, and the maximum value is used as the new minimum pitch angle limiting value of the controller, that is, the thrust applied to the unit is changed by changing the minimum pitch angle limiting value of the controller in real time, so that wind wheel thrust estimation-based load optimization control on the wind power generation unit is realized, and the design cost of the wind power generator is reduced.

Description

technical field [0001] The present invention relates to the technical field of load control of a wind power generating set, in particular to a control method of a wind generating set based on wind wheel thrust estimation. Background technique [0002] With the development of wind power generation technology and market demand, the capacity of wind turbines is getting larger and longer, and the blades are getting longer and longer, and the wind turbines often operate in a relatively harsh external environment, which causes the unit load to increase. It constitutes a great safety hazard to the operation of the unit and brings negative impact on the owner's economic benefits. [0003] Aiming at the problem of excessive unit load, there are currently many solutions, among which the following two solutions are common: [0004] 1. Strengthen the unit components to improve the safety performance of the unit; [0005] 2. Optimizing the control strategy and optimizing the load reduc...

AI Technical Summary

Problems solved by technology

However, the above methods all indirectly estimate the thrust of the wind turbine through other parameters, and there are problems of large estimation errors and loss of power generation

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