A method and device for controlling a pitch system of a wind turbine, and a pitch system

Abstract

The invention discloses a control method and device for a pitch change system of a wind turbine, wherein the method includes: receiving a command to retract the blade; judging whether a blade rotation angle signal is detected; if yes, controlling the blade to rotate to The preset stop position; if not, obtain the previous blade rotation angle value, and control the blade to rotate to the preset stop position according to the previous blade rotation angle signal. A pitch system is also disclosed. By setting the memory in the wind turbine pitch system to store the real-time rotation angle of the blades, when the wind turbine is shut down in an emergency, if the pitch system cannot collect the real-time rotation angle of the blades, it can use the previous blade rotation angle signal The angle value is controlled to retract the blades to a safe position, which reduces the impact of the large load of the wind turbine and improves the safety of the wind turbine during emergency shutdown.

Description

technical field [0001] The invention relates to the field of wind turbine control, in particular to a control method, device and pitch system for a wind turbine pitch system. Background technique [0002] As an important part of the wind turbine, the pitch system is used to receive commands from the main control system, control the blades to rotate to a set angle, and then control the speed of the wind rotor to realize the control of the output power of the wind turbine. When it is used as the pneumatic brake of the fan in an emergency, the blades are controlled to retract quickly, and the fan is stopped safely through aerodynamic braking to achieve the purpose of protecting the safety of the unit. [0003] The current wind turbines use a constant pitch speed to retract the pitch or follow the set pitch curve to a safe position when a fault occurs and an emergency shutdown occurs. In the process of retracting the blades, the angle of the blades cannot be collected suddenly,...

AI Technical Summary

Problems solved by technology

[0003] The current wind turbines use a constant pitch speed to retract the pitch or follow the set pitch curve to a safe position when a fault occurs and an emergency shutdown occurs. In the process of retracting the blades, the angle of the blades cannot be collected suddenly, the blades will not be retracted to a safe position, and the wind turbine will be impacted by a large load, which increases the safety of the wind turbine

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