Modeling and Simulation Method for Mechanical Transient Characteristics of Wind Turbine Transmission Chain

Abstract

A method for modeling and simulating the mechanical transient characteristics of a transmission chain of a wind turbine, the method comprising: (1) establishing a three-dimensional model of the transmission chain of a wind turbine. (2) Import the 3D model of the transmission chain into ANSYS and ADAMS, and establish the finite element model and rigid-flexible coupling model of the transmission chain. The rigid-flexible coupling model considers the flexibility of the main shaft, planetary carrier, transmission shaft and output shaft. (3) Establish the wind turbine model and calculate the transmission chain load when the power grid is instantaneously faulty, and simulate the power grid fault through the voltage drop generator. After the calculation, the torque-time history of the transmission chain is extracted. (4) Load the torque-time history of the transmission chain into the ADAMS model as the load boundary condition for the simulation of the mechanical transient characteristics of the transmission chain, and implement the torsional vibration response, stress and other mechanical transient characteristics of the transmission chain in ADAMS when the grid transient fault occurs. Simulation analysis, and check and evaluation of the mechanical transient characteristics of the transmission chain. (5) Select the key load point of the transmission chain, and implement the 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...

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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

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