Analysis System And Software Of The Wind Turbine Dynamic Process

This paper presents the analysis system and software of the horizontal axis wind turbine (HAWT) dynamic process. To various types of operating control schemes, the dynamic process of HAWT is systematically analyzed and its more accurate prediction model is developed. Based on these, a system software for HAWT dynamic process analysis "PowerTrainDesign for Windows" is integrated with Visual C++. The research work is a part of the National Natural Science Foundation project "Research on the dynamic characteristics of wind turbine in 3-D turbulent wind fields". This paper includes three sections: dynamic model of the drive train, dynamic model of the generator, system software.In the dynamic model of the drive train, some basic concepts including the generating technology basic theory sorting and characteristics of wind turbine are discussed. The rigid shaft model and flexible shaft model of the drive train based on the spring-mass-damper system are used to analyze the dynamics of the drive train. A sample grid-connected 300kW HAWT is simulated using the analysis method. The result of the comparison between the two models is obtained and their differences are discussed.In the dynamic model of the generator, through the research of its dynamic characteristics and control strategies, dynamic models adapted for control design of fixed speed and variable speed wind turbines are built and relevant simulation analysis means are established. For the flexible shaft model, a computer program frame for dynamic model is set up in the MATLAB. The dynamic processes of HAWT which support several aerodynamic moments are simulated and the simulation results are analyzed and compared.The numerical values of the one order differential equations are obtained by Runge-Kutta method with variable step. The software is designed with object oriented programming, which can be maintained and extended conveniently. The user interface has favorable maneuverability, which satisfies the software engineering standard. Finally, the prediction model is used to calculate the dynamic performance of 200kW HAWT. The calculation results are compared with analytical results using a commercial wind turbine analytical software "Bladed for Windows". The good agreement is achieved and the reliability of the dynamic models in this paper is testified.