Yaw ultralimit IPC variable rate stop method for wind generating set

Abstract

The invention discloses a yaw ultralimit IPC variable rate stop method for a wind generating set. According to the yaw ultralimit IPC variable rate stop method for the wind generating set, a load shedding control module based on yaw ultralimit IPC variable rate feathering of a wind wheel azimuth angle is added on the basis of a conventional control strategy, specifically, when the wind generatingset enters into a stop logic, whether a fault type triggered by the wind generating set is a yaw ultralimit stop alarm or not is first distinguished, if not, corresponding stop logic action is adopted, and if so, the IPC variable rate stop is adopted; real-time measurement of a fan impeller azimuth angle through sensors is carried out; and variable pitch of blades of the wind generating set is carried out based on an IPC variable rate feathering logic of the azimuth angle, and pitch angles are increased gradually, when the pitch angles of three blades are increased to more than 60 degrees, CPCis adopted to carry out feathering until the pitch angles of the three blades reach the maximum pitch angles, feathering stop action is completed. The yaw ultralimit IPC variable rate stop method forthe wind generating set can reduce the overturning moment introduced by unbalanced thrust and effectively realize load optimization control over the wind generating set under special working conditions.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to an IPC variable-rate shutdown method for a wind power generator set when its yaw exceeds the limit. Background technique [0002] It is known in the industry that with the development of wind power generation technology and market demand, the capacity of wind turbines is getting larger and longer, and the blades are getting longer and longer, and the wind turbines often operate in relatively harsh external environments, which causes the unit load to increase. If it gets bigger and bigger, it will pose a great safety hazard to the operation of the unit and bring a negative impact on the economic benefits of the owner. [0003] When the wind speed increases sharply (increasing 15m / s within 10s) and the wind direction changes suddenly, the corresponding working condition is dlc1.4 (IEC-3rd), and the wind turbines bear a large load. To solve this problem, many solutions...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problem of excessive load of the current wind power generating set in DLC1.4 (IEC-3rd), the present invention proposes a reliable IPC variable speed stop method for wind power generating set yaw exceeding the limit, by reducing the aerodynamic imbalance, fundamentally The load is reduced, and the pitch angle is increased or decreased according to the different azimuth angles of the blades to reduce the unbalanced force on the blades, thereby reducing the load, that is, at the azimuth angle of 0 degrees, reduce the pitch angle and increase the angle of attack , reduce the reverse thrust, and at the azimuth angle of 180 degrees, increase the pitch angle, reduce the attack angle, and reduce the forward thrust, thereby reducing the overturning bending moment introduced by the unbalanced thrust, effectively realizing the wind turbine Load optimization control under special working conditions

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