Motion control method of megawatt wind generating set feather system

Abstract

The invention relates to a motion control method of a megawatt wind generating set feather system. The motion control method comprises conducting initialization firstly and conducting seven-section type paddle changing, then conducting periodic sampling in a paddle changing process, and adjusting the paddle changing. The motion control method of the megawatt wind generating set feather system is designed according to a set paddle changing system and can find out appropriate acceleration changing rate, maximum accelerated speed and maximum speed according to wind turbine rotate speed and states of a wind turbine so as to effectively restrain pitching vibration (proportion integration differentiation (PID) control is determined by simulation experiments) of the wind turbine. The motion control method of the megawatt wind generating set feather system meets requirements for speedability of wind generating set synchronization and high efficiency in generation, and guarantees safety of the wind generating set.

Description

technical field [0001] The invention relates to a fast control method for variable pitch control of megawatt-level wind power generating sets, and belongs to the technical field of pitch control of wind power generating sets in new energy power generation technology. Background technique: [0002] The pitch system, also known as the pitch system, refers to a system that changes the pitch angle of the blades through control technology to improve wind energy efficiency and obtain the best energy output. The main functions of the pitch control system in wind turbines are: [0003] 1. Adjust the speed of the wind rotor when the wind turbine is started, so that the unit can be quickly connected to the grid to ensure the rapidity of grid connection; [0004] 2. When the wind turbine operates below the rated wind speed, the position of the blades must be precisely and stably controlled to ensure that the unit operates with the maximum wind energy utilization coefficient. [0005...

AI Technical Summary

Problems solved by technology

If the pitch control system cannot operate reliably, it may lead to difficulty in connecting wind turbines to the grid, large pitching vibration, low power generation efficiency or low wind energy utilization coefficient (below the rated wind speed), large power output fluctuations (when the wind speed exceeds the rated wind speed), and fatigue loads. Large, short service life of the unit, if the tower breaks, the cabin falls to the ground

[0010] Many of the general-purpose pitch servo controllers are directly imported from the servo point controllers of machine tools, and it is difficult to fully meet the above requirements whether it is a trapezoidal planning or an s-shaped planning. Wind Turbine Pitch Requirements

If the acceleration value cannot be changed flexibly, it cannot meet the variable inertia moment control of the blade with a large inertia system, so that the pitching vibration of the wind turbine cannot be effectively suppressed

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