中国电机工程学报2023，Vol.43Issue(23)：9285-9296,12.DOI:10.13334/j.0258-8013.pcsee.221787
锁相环型变换器并网系统暂态主导失稳特征分析
Dominant Transient Unstable Characteristics of PLL-based Grid-connected Converters
摘要
Abstract
Due to the strong nonlinearity and coupling of the grid-connected converter,its transient characteristics in the electromagnetic transient processes are usually complicated and difficult to be identified.In this paper,the dominant transient unstable variables and characteristics are analyzed in a single-converter infinite-bus system.First,the dominant unstable variable of the grid-connected converter is identified as the phase-locked loop angle θpll,based on the equivalent time constant analysis.Then,the model is compared with the fifth-order model of the synchronous generator(SG),and the transient characteristics of the fast and slow time scale separation of the grid-connected converter are revealed.In addition,it is found that there exists multi-swing instability during the fault process.It is revealed that this phenomenon is caused by the negative damping which is induced by the terminal voltage control loop.Hence,it is fundamentally different with the multi-swing instability in the multi-SG system.Finally,the effectiveness of the theoretical analysis is verified by Matlab/Simulink simulation.关键词
并网变换器/暂态稳定/等效时间常数/主导失稳特征/锁相环Key words
voltage-source converter/transient stability/equivalent time constant/dominant unstable characteristics/phase-locked loop(PLL)分类
动力与电气工程引用本文复制引用
张亚耀,占萌..锁相环型变换器并网系统暂态主导失稳特征分析[J].中国电机工程学报,2023,43(23):9285-9296,12.基金项目
国家自然科学基金项目(U22B6008).Project Supported by National Natural Science Foundation of China(U22B6008). （U22B6008）
