Modeling and simulating method for mechanical transient characteristics of transmission chain of wind generating set

Abstract

The invention discloses a modeling and simulating method for mechanical transient characteristics of a transmission chain of a wind generating set. The method comprises the following steps: (1) building a three-dimensional model of the transmission chain of the wind generating set; (2) importing the three-dimensional model of the transmission chain into ANSYS and ADAMS, and building a finite element model and a rigid-flexible coupling model of the transmission chain, wherein the rigid-flexible coupling model considers the flexibility of a main shaft, a planet carrier, a transmission shaft and an output shaft; (3) building a wind generating set model, calculating a transmission chain load when a power grid has a transient fault, and simulating the power grid fault through a voltage sag generator, wherein a torque-time history of the transmission chain is extracted after calculation; (4) loading the torque-time history of the transmission chain into an ADAMS model to serve as the load boundary condition for simulating the mechanical transient characteristics of the transmission chain, performing simulation analysis on the mechanical transient characteristics such as the torque vibration response and stress of the transmission chain when the power grid has the transient fault in ADAMS, and checking and evaluating the mechanical transient characteristics of the transmission chain; (5) selecting a key load point of the transmission chain and performing static strength check analysis in ANSYS.

Description

technical field [0001] The invention relates to a modeling and simulation method for the mechanical transient operation characteristics of a wind turbine transmission chain when a power grid fails. Background technique [0002] When a transient fault occurs in the power grid, including voltage drop, phase jump, etc., the transient operation characteristics of the grid-connected wind turbine will have a serious impact on the safety and stability of the wind turbine and even the wind farm. It is of great significance to carry out research on the transient characteristics of grid-connected wind turbines under instantaneous grid faults. [0003] For double-fed variable-speed constant-frequency wind turbines, the stator of the double-fed induction generator is directly connected to the grid, and faults such as instantaneous drop in grid voltage will cause the oscillation of the stator flux of the motor, and induce overvoltage and overcurrent at the stator end of the motor, result...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art that the mechanical transient characteristics of the wind turbine transmission chain cannot be studied in depth, and propose a modeling and simulation method for the mechanical transient characteristics of the wind turbine transmission chain in the case of a transient fault in the power grid

Images