A system and method for triggering emergency feathering of a variable-pitch wind turbine

Abstract

The invention discloses an urgent feathering triggering system and an urgent feathering triggering method for a variable pitch wind generator system. The system judges whether to perform urgent feathering triggering according to a low-level triggering signal output by a safety control system and comprises a pulse generation module (which is formed by connecting a pulse generator and an 'and' logic module), a signal transmission channel and a pulse detection and triggering module; when the low-level triggering signal is in high level, the pulse generator and the low-level triggering signal form continuous and fixed-frequency pulse signal output through the 'and' logic module; when the low-level triggering signal is in low level, the pulse generator and the low-level triggering signal form continuous low-level signal output through the 'and' logic module; and the output signal is transmitted to the pulse detection and triggering module through the signal transmission channel, and the urgent feathering triggering is determined according to a pulse signal situation, so phenomenon that the urgent feathering cannot be triggered effectively because the signal transmission channel is abnormal is avoided.

Description

technical field [0001] The present invention relates to the field of safety control of wind turbines, in particular to a system and method for triggering emergency feathering of variable-pitch wind turbines. Background technique [0002] With the development of variable pitch wind turbines towards megawatts and large scale, the requirements for safety protection and control of the units are getting higher and higher. Among them, the emergency feathering action (quickly driving the blade angle from 0 degrees or the current working angle to around 90 degrees stop angle) is the most critical and effective pneumatic shutdown protection action performed by the unit under abnormal conditions. If the emergency feathering action of the pitch control system is not effectively triggered when needed, serious consequences will be caused. The control system of wind turbines is generally divided into two levels, one level is the main control system, which is responsible for controlling th...

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Problems solved by technology

[0004] The low-level trigger signal of the safety control system has to go through the terminal, slip ring and line to reach the pitch system. There is a certain degree of uncertainty in this process. The conventional low-level trigger method has the problem of not being able to effectively trigger the trigger. That is to say, there is a possibility: when the safety system detects an abnormal working condition, the output trigger signal of the safety system changes from high level to low level, but due to various abnormal reasons of the signal transmission channel (such as internal problems of the slip ring, wiring Terminal problems, etc.), if the signal at the other end of the signal transmission path remains high, the emergency feathering action of the pitch control system cannot be triggered in time, and the unit cannot be stopped effectively and in time, which may cause serious consequences

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