A method for suppressing wind-shear tower shadow fluctuations in a wind power system

Abstract

The invention provides a method for restraining wind shear tower shadow pulsation of a wind power system to overcome the technical defects in an existing wind power system, and pulsation amplitude is effectively reduced by torque compensation and control. A wind shear tower shadow signal is extracted, the real wind field wind shear tower shadow signal creatively replaces a signal derived from a theoretical formula, influence on the signal from factors such as terrain and interference is eliminated, and torque and power pulsation of a double-fed wind generation set caused by the wind shear tower shadow effect are effectively restrained. The method has the advantages that torque and power pulsation caused by the wind shear tower shadow effect are remarkably restrained, electromagnetic torque and power pulsation quantity caused by the wind shear tower shadow effect are remarkably decreased, a mechanical part can be effectively protected, the service life is prolonged, and reliable operation of the wind power system is ensured to the maximum extent, and the quality of electric energy transmitted to a power grid is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a method for suppressing wind shear tower shadow pulsation in a wind power system. Background technique [0002] Wind power generation, as an effective form of renewable energy utilization, has attracted more and more attention in recent years. The torque ripple generated by the wind shear tower shadow in the doubly-fed wind power system will cause mechanical fatigue of mechanical parts such as gearboxes, thereby affecting mechanical The service life of some components increases the maintenance engineering volume and maintenance cost of the entire wind power system, which affects the stable operation of the wind power system. In addition, the wind shear tower shadow will produce the aerodynamic torque pulsation of the low-speed shaft of the wind turbine. If no suppression measures are taken, the power pulsation generated by the grid-connected engine will...

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Problems solved by technology

[0002] Wind power generation, as an effective form of renewable energy utilization, has attracted more and more attention in recent years. The torque ripple generated by the wind shear tower shadow in the doubly-fed wind power system will cause mechanical fatigue of mechanical parts such as gearboxes, thereby affecting mechanical The service life of some components increases the maintenance engineering volume and maintenance cost of the entire wind power system, which affects the stable operation of the wind power system

In addition, the wind shear tower shadow will produce the aerodynamic torque pulsation of the low-speed shaft of the wind turbine. If no suppression measures are taken, the power pulsation generated by the grid-connected engine will affect the grid-connected power quality and operation stability, and in severe cases, it will cause wind turbines. fault, so it is necessary to suppress the torque ripple caused by the wind shear tower shadow effect

[0003] The document "SimulationModelofWindTurbine3pTorqueOscillationsDuetoWindShearandTowerShadow" qualitatively analyzes the influence of torque ripple caused by wind shear and tower shadow effects on the mechanical transmission mechanism of wind power generation systems, while the document "ADynamicWindTurbineSimulatorofthewindturbinegeneratorsystem" only describes wind shear, tower shadow effects and the impact on system output power However, these literatures did not study how to suppress the torque and power ripple caused by wind shear and tower shadow effect

The document "FlickerMitigation by ActivePowerControlofVariable-SpeedWindTurbinesWithFull-ScaleBack-to-BackPowerConverters" proposes a power fluctuation suppression strategy based on DC voltage compensation for wind-shear tower shadow effect, but the proposed scheme is only applicable to direct-drive wind turbines. When feeding wind turbines, it cannot restrain the power pulsation on the stator side

[0004] In summary, there is no effective solution in the prior art for the pulsation problem of wind turbines caused by the wind-shear tower shadow phenomenon.

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