Analysis Of Directly Driven Permanent Magnetic Wind Power Generator Loads And Early Fault Evolution

With the aggravation of the worldwide energy crisis,the human are eager for the clean energy. Recently,the operation of offshore wind farm makes the capacity of one single wind turbine increasing. Therefore,how to improve the level of early failure analysis of wind turbine has become the hot topics in the study of scholars at home and abroad.Combining with extreme extension theory and nonlinear theory, this paper develops a analysis method of the wind turbine load and early failure and studies a 1.5 MW direct-drive permanent magnet wind turbine in a domestic wind power plant. The main research contents:(1)With the analysis and research of the meteorological parameters, operation parameters and basic load parameters which are obtained from the process of testing the wind turbine blades and the main shaft,this paper makes the selection of main test hardwares and works out the main method to test part of the blades and main shaft.(2)Basing on the various parameters and basic loads obtained from the tests of blades and main shaft, this paper studies the mathematical theory in the process of load data analysis. Using the Weibull distribution and Improved rain flow count method with double parameters,this paper obtains the fitting curve of wind speed and load spectrum and equivalent load of blades and main shaft.with the thought of modular programming,this paper writes and debugs the program of all above theories by Famos software.(3)Through analyzing the load theory and load analysis status quo at home and abroad, this paper founds the shortcomings in the process of load and failure analysis and uses the POT extension extremum theory to compensate the extreme load. Combining the analysis of the nonlinear fatigue damage theory, the revised load spectrum and equivalent load of blade and main shaft is obtained in this paper. Comparing with result of a domestic authoritative testing institutions verifies the feasibility and reliability of the proposed method in this paper. Finally, it is concluded that the evolution curve of blades and main shaft early failure.This study is expected to providing the theoretical support and method support to the design and repair plan of the wind turbine blades and main shaft.