【摘要】 借鉴同步机功角及其小干扰稳定的基本理论,从电压空间矢量关系和小干扰分析模型的角度对双馈风机的小干扰稳定性进行了分析。首先,根据内电势、端电压等电压空间矢量关系,定义了双馈风机功角。然后,通过风机锁相环动态方程,建立了双馈风机的小干扰稳定分析模型,并分析了其与同步机小干扰稳定分析模型的相似性。在此基础上,利用模态分析法研究了锁相环对双馈风机小干扰稳定性的影响。研究表明,锁相环参数是决定双馈风机小干扰稳定的关键因素,其参数配置不当可能导致风机小干扰失稳。最后,通过时域仿真和模态分析验证了锁相环参数对双馈风机功角变化及其小干扰稳定的影响。更多还原

【Abstract】 According to the basic theories of power angle and small-signal stability of synchronous generators,the small-signal stability of the doubly-fed induction generator(DFIG)based wind turbine is analyzed in terms of voltage vector space relationships and the small-signal analysis model.Firstly,the power angle of DFIG-based wind turbine is defined according to the space relationship between the terminal voltage and the internal electric potential.Then,the small-signal analysis model of DFIG-based wind turbine is built based on the dynamic equations of phase-locked loop(PLL).And the similarity of DFIGbased wind turbine is studied compared with that of synchronous generator.Furthermore,the impacts of PLL parameters on the small-signal stability of DFIG-based wind turbine are analyzed.The study shows that the PLL parameter is determinant to the small-signal stability of DFIG-based wind turbine.The small-signal instability of DFIG-based wind turbine may occur with inappropriate selection of parameters of PLL.Finally,the influences of PLL with different parameters on the power angle variation and the small-signal stability of DFIG-based wind turbine are verified by modal analysis and time domain simulation.更多还原