Method, device and system for safety protection used in failure of putting away oar of blade of wind turbine generator

Abstract

The invention discloses a method, a device and a system for safety protection used in failure of putting away an oar of a blade of a wind turbine generator. The method comprises the following steps: collecting and computing a real-time rotating speed of a blade hub; after a safety chain system sends a stopping command, if the rotating speed of the blade hub is continuously increased, judging a pitch control system to have a fault of putting away the oar; computing a yaw angle command; sending the computed yaw angle command to a master control PLC (Programmable Logic Controller), and controlling a yaw system to carry out a yaw action through the master control PLC. The system comprises a rotating speed computing module, a pitch control fault judging module and a yaw command computing module. The device comprises a safety protection controller internally provided with the system and connected with the safety chain system and the master control PLC; a rotating sensor used for collecting the real-time rotating speed of the blade hub; and a rotating speed processing circuit connected with the rotating speed sensor and the safety protection controller. According to the invention, the overspeed risk of the wind turbine in a stopping process is reduced, and the safety of the wind turbine and the reliability of judgment of the pitch control fault are improved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a safety protection method, device and system when blade retraction of a wind turbine unit fails. Background technique [0002] In recent years, with the continuous development of wind power generation, the installed capacity of wind farms has increased year by year, and the proportion of wind power generation has also increased, gradually becoming a conventional energy source. With the continuous improvement of the installed capacity of wind turbines, the performance requirements of the industry for wind turbines are also getting higher and higher. Among the various performances of wind turbines, safety comes first. In order to improve the safety of wind turbines, a safety chain system will be introduced in the general system design. The safety chain system is independent of the wind turbine control system. Once a certain safety factor in the safety chain system t...

AI Technical Summary

Problems solved by technology

If there is some potential fault in the pitch control system that prevents the pitch retraction, such as loss of communication or jamming of one or more blades, the unit will not be able to stop with aerodynamic brakes and continue to capture wind energy, resulting in The speed of the blade hub of the unit increases rapidly and exceeds the speed in a short period of time. If no measures are taken, the speed will continue to increase, which will eventually cause devastating damage to the unit.

[0005] In the existing system design, this potential safety hazard is often not considered, or although this potential safety hazard is considered, the measures are mainly focused on improving the reliability of the safety chain system and the pitch control system

[0006] It can be seen that the existing system design has deficiencies in terms of reliability and safety, and needs to be further improved.

Images