基于正序阻抗的直驱风电机组次/超同步振荡影响因素分析

Analysis of Sub/Super-Synchronous Oscillation Influencing Factors of D-PMSGs Based on Positive Sequence Impedance

为深入研究直驱风电机组与交流电网的交互作用引发的次/超同步振荡问题,首先,利用谐波线性化方法建立直驱风电机组正序阻抗模型,并给出了次/超同步振荡的稳定性判据;其次,通过频率扫描法验证了模型的合理性;利用波特图,揭示电流环和锁相环控制参数对直驱风电机组次/超同步振荡特性的影响规律;最后,基于Matlab/Simulink仿真平台搭建直驱风电机组并网系统进行时域仿真,并与频域分析比较,验证了阻抗特性分析的合理性。

To investigate the issue of sub/super-synchronous oscillation caused by the interactions between D-PMSGs and power grid,the positive sequence impedance model of a D-PMSG was established based on the harmonic linearization theory.Meanwhile,the impedance-based stability criterion was developed upon the model.Then,the rationality of the model was verified by frequency scanning method.After that,the bode diagram was used to reveal the rule of current loop control parameters and PLL control parameters on sub/super-synchronous oscillation.Finally,a D-PMSGs-integrated system was built on the Matlab/Simulink simulation platform.The time domain simulation was carried and was compared with frequency domain analysis to verify the rationality of the output impedance characteristics analysis.