Method and system for determining blade control parameter of variable speed and variable pitch wind generating set

Abstract

The invention provides a method and a system for determining a blade control parameter of a variable speed and variable pitch wind generating set. The method comprises the following steps: monitoring current set power of a target variable speed and variable pitch wind generating set in real time; determining a curve between a wind power utilization coefficient and a tip speed ratio of the target variable speed and variable pitch wind generating set; determining an intersection point between the wind power utilization coefficient and the tip speed ratio corresponding to different pitch angles and a set power value at current air density corresponding to the intersection point; when the monitored current set power meets a set power set value, determining a minimum pitch angle corresponding to the current set power under the condition of avoiding blade stall; when the current set power is within the range of two set power set values, determining the minimum pitch angle corresponding to the current set power under the condition of avoiding blade stall by using an interpolation method. The purposes of avoiding the blade stall and improving the set operation stability and the power generation under the condition that the original design of the set is not changed can be achieved.

Description

technical field [0001] The present application relates to the field of control systems of wind power generators, and in particular to a method and system for determining control parameters of blades of variable-speed and variable-pitch wind power generators. Background technique [0002] With the development of technology, people have higher and higher requirements for avoiding blade failure of variable speed and pitch wind turbines. [0003] The existing method to avoid blade stall is to solve the problem of blade stall near the rated wind speed of the wind turbine by increasing the rated speed of the unit, selecting blades with high power of the unit, and selecting blades of larger capacity units (that is, using longer blades). Although these methods have solved the problem of blade stall near the rated wind speed of wind turbines in high-altitude areas to a certain extent, these methods are not suitable for solving the problem of blade stall caused by factors other than h...

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Problems solved by technology

[0005] The technical problem to be solved in this application is to provide a method and system for determining the blade control parameters of variable-speed and variable-pitch wind turbines, which solves the problem that the prior art is not suitable for solving the blade stall caused by factors other than high-altitude areas, and These methods will increase the load level of wind turbines and even affect the design and selection of components, which will not improve the problem of avoiding stalls for wind turbines that have already been running and have stalled.

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