双馈风电机组多机并联运行的短路电流特征及其机理

发布时间：2018-06-07 01:44

本文选题：风力发电 + 双馈感应发电机(DFIG)　；参考：《电力系统自动化》2016年03期

【摘要】：双馈感应发电机(DFIG)输出短路电流在组成、大小和衰减时间上与同步发电机区别较大,使得目前DFIG的故障暂态分析已成为风电并网研究的热点。然而,现有研究多以DFIG的单机并网系统为对象,由于风电场、风电机群集电系统的网络化特征,单个DFIG的暂态特性并不足以表征大量机组共同作用的整体性特征。对多个DFIG并联运行时短路电流较单机并网运行时的区别及其产生机理进行研究。基于三相电路空间矢量的基尔霍夫定律和元件特性方程的分析,通过推导DFIG的短路暂态过程,构建了DFIG单机和多机并联运行时工频、直流和转速频率分量的矢量等效电路,进而推导了DFIG短路电流及其相关性的解析式,分析了DFIG多机并联运行下短路电流的变异规律,并通过仿真验证了理论分析的正确性。
[Abstract]:The output short-circuit current of doubly-fed induction generator (DFIGG) is different from that of synchronous generator in composition, size and attenuation time, which makes the transient analysis of DFIG fault become a hot topic in wind power grid connection research. However, most of the existing researches focus on the single-machine grid-connected system of DFIG. Because of the network characteristics of wind farm and wind-motor cluster power system, the transient characteristics of a single DFIG are not enough to characterize the overall characteristics of a large number of units working together. The difference and generation mechanism of short circuit current in parallel operation of multiple DFIG are studied. Based on the analysis of Kirchhoff's law of three-phase circuit space vector and the characteristic equation of components, by deducing the short-circuit transient process of DFIG, the vector equivalent circuit of power frequency, DC and rotational speed frequency components of single and multi-machine parallel operation of DFIG is constructed. Furthermore, the analytical formula of DFIG short circuit current and its correlation is derived, and the variation law of short circuit current under DFIG parallel operation is analyzed, and the correctness of the theoretical analysis is verified by simulation.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室(重庆大学);国网四川省电力公司电力调度控制中心;
【基金】：国家自然科学基金资助项目(51407017) 中央高校基本科研业务费专项资金资助项目(106112015CDJXY150001;106112015CDJZR155516)~~
【分类号】：TM315

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