Advanced System-Level Model Reduction Method for Multi-Converter DC Power Systems  

作　　者：Lin Zhu Xueshen Zhao Xialin Li Li Guo Bo Zhao Zhanfeng Deng Hao Lu Chengshan Wang 

机构地区：[1]the Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China [2]the Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310014,China [3]the State Grid Global Energy Interconnection Research Institute,Beijing 102209,China

出　　处：《CSEE Journal of Power and Energy Systems》2024年第4期1550-1562,共13页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported by the National Key Research and Development Program of China(2020YFB1506800);the China Postdoctoral Science Foundation(2021M692378);the National Natural Science Foundation of China(51977142).

摘　　要：For dynamic stability analysis and instability mechanism understanding of multi-converter medium voltage DC power systems with droop-based double-loop control,an advanced system-level model reduction method is proposed.With this method,mathematical relationships of control parameters(e.g.,current and voltage control parameters)between the system and its equivalent reduced-order model are established.First,open-loop and closed-loop equivalent reduced-order models of current control loop considering dynamic interaction among converters are established.An instability mechanism(e.g.,unreasonable current control parameters)of the system can be revealed intuitively.Theoretical guidance for adjustment of current control parameters can also be given.Then,considering dynamic interaction of current control among converters,open-loop and closed-loop equivalent reduced-order models of voltage control loop are established.Oscillation frequency and damping factor of DC bus voltage in a wide oscillation frequency range(e.g.,10–50 Hz)can be evaluated accurately.More importantly,accuracy of advanced system-level model reduction method is not compromised,even for MVDC power systems with inconsistent control parameters and different number of converters.Finally,experiments in RT-BOX hardware-in-the-loop experimental platform are conducted to validate the advanced system-level model reduction method.

关 键 词：Closed-loop reduced-order model instability mechanism open-loop reduced-order model stability analysis system-level model reduction method 

分 类 号：TM46[电气工程—电器]