System and method for pre-warning and controlling gust load of wind power station

Abstract

The invention provides a system and a method for pre-warning and controlling gust load of a wind power station. The system comprises at least one standby gust load pre-warning machine, and a wind power station level control unit; the at least one standby gust load pre-warning machine is at least one wind driven generator which is distributed at the periphery of the wind power station, and is positioned at the windage front position of the wind power station; and the wind power station level control unit acquires a wind angle of the wind power station, selects the current gust load pre-warning machine aiming at the wind angle from at least one gust load pre-warning machine according to the wind angle, acquires the characteristic value of the current gust according to the running state of the current gust load pre-warning machine and performs pitch regulation on all wind driven generators distributed in the wind power station according to the pitch regulation velocity corresponding to the characteristic value of the current gust, and changes the pitch angles of blades of all wind driven generators to ensure that all the wind driven generators run at rated power if the characteristic value of the current gust is more than a preset threshold value and less than the safety threshold value of the current gust load pre-warning machine.

Description

technical field [0001] The invention belongs to the field of wind power generation, and relates to a wind farm gust load early warning control system and method. Background technique [0002] Wind load is the main load borne by the mechanical components of wind turbines, and drastic changes in wind speed will bring large load fluctuations to wind turbines. [0003] The current megawatt-level variable-speed and variable-pitch wind turbines mainly reduce the impact of wind speed changes on loads by changing the torque of the generator and changing the pitch angle of the blades. Usually, when the wind speed increases beyond the rated wind speed, the blade pitch angle is increased to reduce the power capture, thereby limiting the load increase, and when the wind speed is small, the blade pitch angle is reduced to increase the power output. However, such a control method cannot always achieve the purpose of controlling load and power. If the wind speed changes too fast, the powe...

AI Technical Summary

Problems solved by technology

[0005] However, increasing the strength of the components will greatly increase the manufacturing cost of the wind turbine; in addition, the control parameters of the pitch action of the wind turbine usually come from the change of its own speed or power, because the change information of the wind speed cannot be obtained in advance, thus causing It cannot solve the hysteresis problem of the pitch action, and the increase of the pitch rate will increase the fatigue load of the pitch system

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