Small signal stability mathematical model of directly driven permanent magnet wind power system based on dual PWM converters was established, and the effect on power system stability from parameter variations was researched after wind power system was connected to gird. Some meaningful conclusions were obtained. Maximum power point tracking scheme was applied to wind turbine, and maximum power output was realized in wind power system. Machine side and grid side converters' control structure were studied s then a simulation model was built by Matlab. Time domain analysis were performed in different parameters conditions. Results show system keeps good small signal stability in different parameters conditions, theory analysis correctness was proved, which provides useful theory reference for safe and stable connected operation of direct-driven wind power system.%建立了基于双PWM变换器的直驱永磁型风电系统的小扰动稳定性分析数学模型,研究了风电系统并网后参数变化对电力系统稳定性的影响,得到了一些有意义的结论；为保证风电系统最大功率输出,风力机采用了最大功率点跟踪控制策略；研究了机侧和网侧变换器控制结构；利用Matlab建模仿真,对系统在不同参数条件下进行了时域分析.仿真结果表明,不同的参数条件下,系统具有较好的小扰动稳定性,验证了理论分析的正确性,为直驱永磁型风电系统安全稳定地并网运行提供了可借鉴的理论依据.
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