直驱永磁同步风力发电机动力学特性仿真分析

摘要

In order to study the chaotic characteristics of the direct-drive permanent-magnet synchronous generator.Firstly,the mathematical model of the DDPMSG was established,and the development process of the system from voltage stability to collapse was analyzed.Then study the chaotic characteristics of the DDPMSG by programming in the MATLAB software.Finally,the mathematical model of the DDPMSG was established in PSCAD/EMTDC software,and the voltage collapse phenomenon caused by the change of wind speed was simulated by the time-domain simulation.The simulation results showed that when the system parameters match each other and wind speed reaches the critical value,the motor appeared to have no regular oscillation,and the voltage was high and low or even crashes,which seriously affected the stability of the power grid.%为了研究直驱永磁风力发电机的混沌特性,通过建立永磁同步电机的混沌模型,从理论上分析了电机在某一参数改变时系统从电压稳定到崩溃的发展过程.在MATLAB中进行编程研究永磁同步电机的混沌特性,在PSCAD/EMTDC中,搭建直驱永磁风力发电机模型,对直驱风力发电机随着风速改变而引起的电压崩溃现象进行了时域仿真,与混沌特性比较,验证正确性.仿真结果表明,在系统参数匹配的条件下,当风速达到临界值时,电机出现无规则振荡,电压忽高忽低乃至崩溃,严重影响电机的并网稳定性.