Power flow calculation for a distribution system with multi-port PETs:an improved AC-DC decoupling iterative method  

作　　者：Hang Yin Qiang Li Youbo Liu Xianglong Liu Yue Xiang Junyong Liu 

机构地区：[1]School of Electrical Engineering,Sichuan University,Chengdu,Sichuan Province,P.R.China [2]State Grid Jiangsu Electric Power Research Institute,Nanjing,Jiangsu Province,P.R.China [3]Department of Electrical and Electronic Engineering,Imperial College London,London SW72AZ,U.K

出　　处：《Global Energy Interconnection》2020年第4期313-323,共11页全球能源互联网（英文版）

基　　金：supported by the National Key Research and Development Program of China(2017YFB0903300).

摘　　要：Recently,power electronic transformers(PETs)have received widespread attention owing to their flexible networking,diverse operating modes,and abundant control objects.In this study,we established a steady-state model of PETs and applied it to the power flow calculation of AC-DC hybrid systems with PETs,considering the topology,power balance,loss,and control characteristics of multi-port PETs.To address new problems caused by the introduction of the PET port and control equations to the power flow calculation,this study proposes an iterative method of AC-DC mixed power flow decoupling based on step optimization,which can achieve AC-DC decoupling and effectively improve convergence.The results show that the proposed algorithm improves the iterative method and overcomes the overcorrection and initial value sensitivity problems of conventional iterative algorithms.

关 键 词：Power electronic transformers AC-DC distribution systems AC-DC mixed power flow algorithm 

分 类 号：TM744[电气工程—电力系统及自动化]