Shutdown control method and system for wind power generating set

Abstract

The invention discloses a method and system for controlling the shutdown of a wind power generating set. The control method includes: if the main control controller of the main control system of the wind power generating set receives the grid power failure flag, the main control controller does not trigger the action of breaking the pitch safety chain, and controls the pitch system to perform the speed change. wherein, the power grid power-off flag is the grid power-off flag sent by the converter controller to the main control controller when it judges that the power grid is power-off, and the pitch safety chain is the power-off flag of the main control A safety chain between the controller and the pitch controller of the pitch system. Through the shutdown control method and system of the present invention, it is realized that the main control system controls the pitch system to perform variable-speed pitch retraction under the power-off working condition of the power grid, and there is no need to modify the safety chain of the whole machine.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method and system for controlling shutdown of a wind power generating set. Background technique [0002] In the design of wind turbines, it is necessary to determine the environment in which the wind turbines are located and the various loads generated under various operating conditions to ensure that the wind turbines can operate normally during their designed life. It is the most basic work in wind turbine design, and it is also an important research topic of wind turbine control strategy. With the continuous increase of unit capacity, tower height, and blade length, the load impact on wind turbines also increases, which brings new and huge challenges to the safety of wind turbines, tower strength and production costs. . [0003] Therefore, the load control of wind turbines is becoming more and more important. Excessive wind turbine load will reduce the servi...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: when the grid is powered off, if the pitch system detects that the grid is powered off, the slow detection speed will cause the first stage of pitch retraction to start too slowly

The safety chain of the converter is removed from the safety chain of the whole machine. Although the main control system can control the pitch system to control the pitch system to perform variable speed pitch reduction, when the converter has other faults that do not require variable speed pitch reduction, especially the main When the communication between the control system and the converter is abnormal, the converter cannot trigger the safety chain and the wind turbine cannot be shut down immediately.

In addition, the hardware safety chain is prior to the hardware protection higher than the software protection, and it is the last barrier of the wind turbine safety protection system, so this method of eliminating the safety chain of the converter is not advisable.

[0006] It can be seen that none of the current variable-rate propeller retraction schemes can well meet the needs of wind turbine generators for variable-rate propeller retraction under the condition of power failure.

Images