Current-limiting Characteristics of a Modified Flux-coupling Type Superconducting Fault Current Limiter and Its Effects on the Transient Stability of a Multi-machine Power System  

作　　者：Yonghui He Langheng Cao Feng Zheng 

机构地区：[1]Department of Automation Engineering,Fujian Polytechnic of Information Technology,Fuzhou 350003,China [2]China Energy Construction Group Guangdong Electric Power Design and Research Institute Co.,Ltd.,Guangzhou 510663,China [3]School of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350116,China

出　　处：《Chinese Journal of Electrical Engineering》2021年第2期93-102,共10页中国电气工程学报（英文）

基　　金：Supported by the Fujian Young and Middle-Aged Teachers’Science and Technology Research Project(JAT201101).

摘　　要：A modified flux-coupling type superconducting fault current limiter(SFCL)is proposed here for suppressing fault currents.The modified SFCL consists of a coupling transformer,an yttrium barium copper oxide(YBCO)pancake coil,and a controlled switch.By flexibly adjusting the controlled switch’s contact states based on the system operational conditions,the coupling transformer’s primary inductance as well as the YBCO coil’s normal-state resistance are incorporated into the main system for current limitation.Because the modified SFCL has the advantages of resistive and inductive SFCLs,it may improve the power system’s transient behavior.Hence,the SFCL’s effect on the transient stability of a multi-machine power system was also theoretically investigated.Further,simulations were conducted for accessing the SFCL’s performance characteristics under different fault conditions.The results show that using the proposed SFCL can effectively restrain the increased fault current and improve the bus voltage sag;meanwhile,the imitated multi-machine system’s power-angle oscillation can be obviously reduced.

关 键 词：Current-limiting characteristics flux-coupling type SFCL multi-machine power system transient stability 

分 类 号：TM71[电气工程—电力系统及自动化]