System and method for calculating driving torque of wind driven generator yaw system

Abstract

The invention discloses a system and a method for calculating driving torque of a wind driven generator yaw system. The method comprises the steps of modeling with finite element software as a platform and performing solid grid division on a rack bottom plate, a transverse suspending rod, a yaw gear ring, an upper friction plate, a lower friction plate and an adjusting bolt; simulating a disc spring component by a one-way pressed spring unit, wherein one end of the disc spring component is connected with the lower friction plate and the other end of the disc spring component is connected with the adjusting bolt; establishing a node in the center of a tower top flange support surface and connecting the node to the rack bottom plate through a rigid beam unit, wherein the node is used for exerting tower top limit load; defining the material attributes of all the components, wherein the non-linear rigidity of the disc spring component is defined according to tested data of a test; defining constrained boundary conditions and exerting clamping force of the upper friction plate and the lower friction plate as well as outer load; exerting a tiny angular displacement on the node to solve the yaw driving torque. The method can be used for accurately calculating the yaw driving torque, facilitates power optimization selection of a driving motor, is beneficial to cost reduction and suitable for popularization in a wide range.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a driving moment design system and method applied to a yaw system of a wind power generator. Background technique [0002] The yaw system is one of the essential components of the horizontal axis wind turbine. One of the main functions of the yaw system is to provide torque to drive the nacelle to rotate through electricity or drag to complete the wind-facing action. The traditional calculation method of yaw driving torque is mainly to simplify the friction plate into points, determine the pressure between the friction plate and the yaw ring gear, and then calculate the friction torque according to the pressure of each point and the distance to the center of rotation, so as to obtain the yaw system drive torque. However, in the actual working process, due to the continuous increase of the power of the wind turbine, the alternating wind load it bears is becoming more and more...

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Problems solved by technology

In the actual working process, due to the continuous increase of the power of the wind turbine, the alternating wind load it bears is becoming more and more complex, and the structure of the yaw system will undergo flexible deformation after being loaded, resulting in If the pressure distribution between rings is uneven, and the center of gravity of the yaw system deviates from the center of the rotating surface, the traditional engineering calculation method can no longer accurately calculate the required yaw driving torque, which will lead to insufficient or too high driving power of the yaw system. , resulting in vibration and noise of the yaw system or even malfunctioning

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