Method and system for controlling power of wind turbine generator under strong wind condition

Abstract

The invention discloses a method and system for controlling power of a wind turbine generator under the strong wind condition, and belongs to the field of wind power generation. Whether the rotating speed set value and the torque set value of a generator need to be adjusted or not is judged by detecting an anemograph, the newest rotating speed reducing and torque increasing set values of the generator are calculated, the requirement for reducing the unit limit load under the strong wind condition is considered to the maximum degree, and meanwhile it is guaranteed that the output power of the unit is kept unchanged, and no generating capacity loss exists. The torque set point increasing value is obtained through calculation. The rotating speed reducing and torque increasing mode of the generator is adopted as a power control mode under the strong wind condition, and therefore the limit load of large components under the strong wind condition is reduced, meanwhile, the output power of the generator is kept unchanged, and the problems that in a traditional mode, only the rotating speed of the generator is reduced, the torque of the generator is unchanged, consequently, the output power of the unit is reduced, and the generating capacity loss is caused under the condition of frequent strong wind are solved.

Description

technical field [0001] The invention belongs to the field of wind power generation, and relates to a method and system for controlling the power of a wind turbine under strong wind conditions. Background technique [0002] Wind turbines have different power control strategies under different wind speeds. After reaching the rated wind speed, the generator speed is controlled at the set point through pitch control, and the constant power or constant torque method is used to ensure that the output power of the wind turbine is maintained. at rated power. Under the condition of strong wind, the major components of the wind turbine will experience a large bending moment due to the wind force, which will have a certain impact on the long-term safe operation of the unit. In order to extend the cut-out wind speed, the power reduction method is generally used to reduce the ultimate load of the unit. But at the same time inevitably caused the loss of power generation. Therefore, it i...

AI Technical Summary

Problems solved by technology

However, the existing control strategy will inevitably cause a loss of power generation. Although it can effectively reduce the ultimate load of the generator set under strong wind conditions, due to the reduced power operation, the power generation will be sacrificed at the expense of power generation. loss cannot be ignored

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