Torsion load controller for restraining torsional vibration of wind turbine generator and control method

Abstract

The invention provides a torsion load controller for restraining the torsional vibration of a wind turbine generator and a control method. The controller takes torsion angular speed as feedback quantity; the torsion angular speed is a quantity related to the rotation speed and the accelerated speed of a wind wheel; the deviation between the rotate speed and the accelerated speed is subjected to a PI regulator and amplitude limiting, and then serves as controller output; the controller output is overlapped to the torque of a generator; parameters of the PI regulator in the torsion load controller are set; the target of the torsion angular speed during torsional vibration restraining is subjected to optimization design. The controller has high feasibility and applicability, and can quicken the maximum power tracking to a certain extent.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a torsional load controller and a control method for suppressing torsional vibration of a wind turbine shaft system. Background technique [0002] Wind speed is uncontrollable, intermittent, and random, resulting in uncontrollable and fluctuating wind turbine output. In addition, due to the influence of wind shear and tower shadow effect, the wind is not evenly distributed in the entire area swept by the wind turbine. The periodic pulsation of the output of the wind turbine stimulates the shafting torsional vibration; on the other hand, the electromagnetic transient caused by the high and low voltage faults may also stimulate the shafting oscillation under the action of electromechanical coupling. Wind turbine transmission system (including gearbox, drive shaft and flange ring) is an important part of energy transmission in wind power generation. Due to its inherent underdamp...

AI Technical Summary

Problems solved by technology

If the torsional load controller can start with increasing damping and avoiding modal coupling, it can theoretically be expected to obtain better shafting torsional vibration suppression effect. In the existing technology, two independent controllers are required to cooperate to achieve, and it is possible Need to use multiple feedback variables, and there are more controller parameters, difficult parameter adjustment and limiting problems of multiple controllers

[0007] In addition, the existing technology does not fully consider the characteristics of the shaft system and the control target setting. In actual situations, the output of the generator may be limited by the output of the torsional load controller and cannot respond to the torsional vibration of the shaft system.

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