摘要
针对DFIG-WECS(双馈风电系统)在并入弱交流电网时的动态稳定性问题,提出了一种动态稳定性分析指标。首先,考虑风速波动的影响,将DFIG-WECS模型建立为ETDS^(2)M(等效时变离散状态空间模型)。然后,通过将ETDS^(2)M分解为几个相互连接的子系统,并在有限步内迭代每个子系统,构造渐近增益矩阵来量化不同子系统之间的相互作用。最后,提出了WF-SCR(风电场短路比)动态稳定指标,可有效解释DFIG-WECS的动态稳定极限。通过实时仿真和对比研究,验证了ETDS^(2)M和WF-SCR的有效性。
To investigate the dynamic stability of doubly-fed induction generator-based wind energy conversion systems(DFIG-WECS)when connected into weak AC grids,this study proposes a novel dynamic stability assessment index.Firstly,considering the impact of wind speed fluctuations,the DFIG-WECS is modeled as an equivalent time-varying discrete state-space model(ETDS^(2)M).The ETDS^(2)M is then decomposed into several interconnected subsystems.By iteratively analyzing each subsystem within finite steps,an asymptotic gain matrix is constructed to quantify the interactions between the subsystems.Subsequently,a wind farm short-circuit ratio(WF-SCR)based dynamic stability index is proposed,which effectively characterizes the dynamic stability limits of DFIG-WECS.Real-time simulation and comparative studies verify the effectiveness of both the ETDS^(2)M modeling approach and WF-SCR index.
作者
李东东
钟伟伦
孙梦显
赵耀
徐波
刘一鸣
余大钧
LI Dongdong;ZHONG Weilun;SUN Mengxian;ZHAO Yao;XU Bo;LIU Yiming;YU Dajun(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《浙江电力》
2025年第11期48-58,共11页
Zhejiang Electric Power
基金
国家自然科学基金(52377111)。
