永磁风力发电机组机侧变流器建模及仿真

摘要

This article studied the mathematical model of wind turbine,generator and generator-side PWM converter.The model relates to many factors,such as high order and nonlinear.As for the factors above,a better dynamic model was presented,including the model of wind turbine,generator and generator-side PWM converter.In PMSG voltage equation,coupling problem exists between shaft voltages of d and q,so,a magnetic field orientation method was used to decompose the three-phase alternating current into an exciting current component generated by the magnetic flux and torque current component generated by the torque,these two vectors perpendicular to each other,decoupling to each other and adjusting independently.Matlab/Simulink software platform was used to establish the simulation model of the entire system and simulate.The simulation results show the correctness of the model and effectiveness of this control method.%研究了风力机、发电机和机侧PWM变流器的数学模型.由于风力发电机组模型存在高阶、非线性问题,传统方法难以进行总体性能分析.针对上述问题,研究了风力机、发电机和机侧PWM变流器较完善的动态数学模型.PMSG电压方程中d,q轴电压分量之间存在耦合问题,采用磁场定向将三相交流电流分解成为产生磁通的励磁电流分量和产生转矩的转矩电流分量,并使得上述两个矢量相互垂直,彼此解耦,可进行独立调节.利用Matlab/Simulink仿真平台搭建了系统的仿真模型,并进行了仿真.仿真结果表明,提出的模型具有较好的控制效果,证明了模型的正确性和控制策略的可行性,为设计提供了参考依据.