Incidence Matrix based Method for N−1 Contingency Parallel Analysis of Main Transformers in Distribution Networks  

作　　者：Qiubo Zou Fengzhang Luo Tianyu Zhang 

机构地区：[1]Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China [2]Economic and Technology Research Institute,State Grid Tianjin Electric Power Company,Tianjin 3000171,China

出　　处：《CSEE Journal of Power and Energy Systems》2025年第2期705-713,共9页中国电机工程学会电力与能源系统学报(英文)

基　　金：supported in part by National Key Research and Development Program of China under Grant 2020YFB0906000;in part by National Natural Science Foundation of China under Grant 51977140,Grant U1866207 and Grant 51207101;in part by Natural Science Foundation of Tianjin under Grant 19JCYBJC21300。

摘　　要：N−1 security is an important criterion for the development and planning of distribution networks.The existing N−1 contingency analysis methods of distribution networks are primarily based on the unit of components,and the faults of each component are analyzed and verified one by one.The calculation process of these methods is complicated,and the positioning effect of the weak links needed for distribution network planning is insufficient.For this reason,this paper proposes a method of N−1 contingency parallel analysis for main transformers based on the incidence matrix.First,the main transformer incidence matrix is established,and the load transfer process is classified into three types,according to different transfer modes,and the contact matrices are then established respectively.Second,considering the capacity constraint of main transformers and tie-lines,the corresponding capacity matrices are established.The maximum transfer capability(MTC)of the distribution network in the case of each main transformer fault is calculated by contact matrices and capacity matrices,and the N−1 contingency analysis result is obtained by comparing MTC with the load that needs transferring.Meanwhile,the transfer margin of the main transformers and tie-lines after transferring can be obtained in the process of N−1 contingency analysis,so as to find any weak links.An example is given to verify the correctness and effectiveness of the proposed method.In this paper,the N−1 contingency analysis results of all main transformers in the distribution network are expressed analytically through matrices operations,and the weak links can then be intuitively identified.The cumbersome operation of checking each component is avoided,and the computational efficiency is improved.

关 键 词：Analytical expression distribution network N−1 contingency analysis weak link 

分 类 号：TM72[电气工程—电力系统及自动化]