基于阻抗比判据的永磁直驱风力发电系统并网稳定分析方法

摘要

考虑永磁直驱风力发电系统(Permanent Magnet Synchronous Generator,PMSG)的动态特性,提出一种基于阻抗比判据的PMSG并网稳定性分析方法,以提高PMSG并网稳定分析的准确性.首先,基于阻抗比稳定分析原理,推导含变换器系统的并网稳定判据.然后,考虑PMSG的动态特性,在建立状态空间方程的基础上推导出PMSG的小信号模型,进而推导PMSG的输出阻抗表达式,据此分析PMSG并网稳定分析方法且得出具体实现流程.最后,利用PSASP分别搭建含PMSG的简单系统和WSCC-9节点仿真系统.仿真结果验证了所提方法的有效性和准确性.%A method is proposed to improve the accuracy of stability analysis for a gird-connected permanent magnet synchronous generator (PMSG) system based on the impedance ratio criterion,which considers the dynamic characteristics of PMSGs.Firstly,stability analysis theory for the system with electronic converters is deduced using the impedance ratio criterion.And then,the small signal model of a PMSG is established including its dynamic characteristics.Based on the small signal model,the output impedance of a PMSG is derived.Next,the stability analysis method for the gird-connected PMSG is obtained.At last,the simulation results on a PMSG simple system and the WSCC-9 bus system using PSASP verify the effectiveness and accuracy of the proposed method.