Analysis of Transforming dq Impedances of Different Converters to A Common Reference Frame in Complex Converter Networks  

作　　者：Qi Xiao Paolo Mattavelli Aram Khodamoradi Fen Tang 

机构地区：[1]the National Active Distribution Network Technology Research Center,Beijing Jiaotong University,Beijing 100044,China [2]the Department of Management and Engineering,University of Padova,Vicenza 36100,Italy

出　　处：《CES Transactions on Electrical Machines and Systems》2019年第4期342-350,共9页中国电工技术学会电机与系统学报（英文）

基　　金：The support of the first and fourth authors is given by National Key R&D Program of China,2018YFB0905200.The support for the second and third authors is coming from BIRD171227/17 project of the University of Padova.

摘　　要：DQ impedance-based method has been widely used to study the stability of three-phase converter systems.As the dq impedance model of each converter depends on its local dq reference frame,the dq impedance modeling of complex converter networks gets complicated.Because the reference frames of different converters might not fully align,depending on the structure.Thus,in order to find an accurate impedance model of a complex network for stability analysis,converting the impedances of different converters into a common reference frame is required.This paper presents a comprehensive investigation on the transformation of dq impedances to a common reference frame in complex converter networks.Four different methods are introduced and analyzed in a systematic way.Moreover,a rigorous comparison among these approaches is carried out,where the method with the simplest transformation procedure is finally suggested for the modeling of complex converter networks.The performed analysis is verified by injecting two independent small-signal perturbations into the d and the q axis,and doing a point-by-point impedance measurement.

关 键 词：Complex converter networks impedance transformation synchronous rotating dq frame stability analysis. 

分 类 号：TM9[电气工程—电力电子与电力传动]