Partitioning Calculation Method of Short-Circuit Current for High Proportion DG Access to Distribution Network  

作　　者：Wei Wang Qingzhu Shao Shaoliang Wang Yiwei Zhao Yuanbo Ye Duanchao Li Mengyu Wu 

机构地区：[1]Anhui Electric Power Dispatch and Control Center,State Grid Anhui Electric Power Co.,Ltd.,Hefei,230000,China [2]School of Electrical Engineering,Beijing Jiaotong University,Beijing,100000,China

出　　处：《Energy Engineering》2024年第9期2569-2584,共16页能源工程（英文）

基　　金：funded by the National Natural Science Foundation of China(52077004);Anhui Electric Power Company of the State Grid(52120021N00L).

摘　　要：Aiming at the problemthat the traditional short-circuit current calculationmethod is not applicable to Distributed Generation(DG)accessing the distribution network,the paper proposes a short-circuit current partitioning calculation method considering the degree of voltage drop at the grid-connected point of DG.Firstly,the output characteristics of DG in the process of low voltage ride through are analyzed,and the equivalent output model of DG in the fault state is obtained.Secondly,by studying the network voltage distribution law after fault in distribution networks under different DG penetration rates,the degree of voltage drop at the grid-connected point of DG is used as a partition index to partition the distribution network.Then,iterative computation is performed within each partition,and data are transferred between partitions through split nodes to realize the fast partition calculation of short-circuit current for high proportion DG access to distribution network,which solves the problems of long iteration time and large calculation error of traditional short-circuit current.Finally,a 62-node real distribution network model containing a high proportion of DG access is constructed onMATLAB/Simulink,and the simulation verifies the effectiveness of the short-circuit current partitioning calculation method proposed in the paper,and its calculation speed is improved by 48.35%compared with the global iteration method.

关 键 词：High proportion DG short-circuit calculation low voltage ride through partition iteration 

分 类 号：TM727[电气工程—电力系统及自动化]