基于LTP时域分析方法的MMC并网系统稳定性分析  

Stability Analysis of MMC Grid-Connected System Based on LTP Time Domain Analysis Method

作　　者：梅勇[1] 王一帆 谢惠藩[1] 朱建行 林磊[2] MEI Yong;WANG Yifan;XIE Huifan;ZHU Jianhang;LIN Lei(Power Dispatching Control Center,CSG,Guangzhou 510663,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology School,Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中国南方电网电力调度控制中心,广州510623 [2]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074

出　　处：《南方电网技术》2021年第2期74-81,共8页Southern Power System Technology

基　　金：中国南方有限责任公司科技项目(ZDKJXM20180076);国家自然科学基金(51677077).

摘　　要：模块化多电平换流器(modular multilevel converter,MMC)具有多频率耦合特性,在电力系统中存在多频段不稳定风险。区别于现有建模方法,线性周期时变(linear time-periodic,LTP)时域分析方法在建模过程中既没有忽略多频次成分,也没有作复杂的多频次成分展开,适用于MMC并网系统稳定性分析。本文考虑了基频电流控制器及控制器延时,建立了MMC并网系统LTP时域模型,研究MMC连接强电网和弱电网时控制器参数对系统稳定性影响。利用MATLAB/Simulink搭建仿真模型,验证了分析结果的正确性。Modular multilevel converter(MMC)has the characteristics of multi-frequency coupling,and there is a risk of multi-frequency instability in the power system.Different from the existing modeling method,linear time-periodic(LTP)time-domain analysis method does not ignore the multi-frequency components in the modeling process,nor does it make complex multi-frequency components expansion,which is suitable for stability analysis of MMC.In this paper,the fundamental frequency current controller and time delay of controller are considered,and LTP time domain model of the MMC grid-connected system is established to study the influence of the controller parameters on the system stability when the MMC is connected to the strong and weak grids.The simulation model is built by MATLAB/Simulink to verify the correctness of the analysis results.

关 键 词：模块化多电平换流器 线性周期时变 基频电流控制 控制器延时 稳定分析 

分 类 号：TM72[电气工程—电力系统及自动化]