饱和铁心型超导限流器在柔直系统中的限流特性研究  

Study on the Current-Limiting Characteristics of Saturated Iron Core Superconducting Fault Current Limiter in MMC-HVDC System

作　　者：谭翔宇 任丽[1] 唐跃进[1] 石晶[1] 徐颖[1] Tan Xiangyu;Ren Li;Tang Yuejin;Shi Jing;Xu Ying(State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology,Wuhan 430074 China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),武汉430074

出　　处：《电工技术学报》2020年第S02期556-561,共6页Transactions of China Electrotechnical Society

基　　金：广东电网科技项目(GDKJXM20180563)资助。

摘　　要：饱和铁心型超导限流器是一种新型故障限流装置,在处理电力系统短路故障方面具有广阔应用前景。该限流器利用铁心的饱和特性,具有响应速度快、限流过程不失超等优点。但是,目前对于饱和铁心型超导限流器的研究主要集中在交流系统,对其在柔性直流输电系统中的应用效果及限流特性的研究较少。该文分析了饱和铁心型超导限流器在柔直系统中的限流机理,基于PSCAD/EMTDC,研究了限流器在基于模块化多电平换流器的柔性直流输电(MMC-HVDC)系统中的限流特性。结果表明,饱和铁心型限流器对柔直系统短路电流峰值具有很强的限制作用,但无法限制故障稳态电流值。最后,分析了励磁电流大小对铁心饱和状态及限流器限流效果的影响,明确了励磁电流的选取原则。Saturated iron core superconducting fault current limiter(SI-SFCL),which utilizes the saturation characteristics of iron core,has broad application prospects in handling with short circuit fault.SI-SFCL has the advantages of fast response speed,and the superconducting coils do not quench during the whole current limiting process.However,the research of SI-SFCL mainly focuses on AC systems,and there are few studies on its application in DC system.This paper analyzes the current-limiting mechanism of SI-SFCL in modular multilevel converter based high voltage direct current(MMC-HVDC)system.Based on PSCAD/EMTDC,the current-limiting characteristics of SI-SFCL in MMC-HVDC system are studied.The results show that SI-SFCL has strong limiting effect on the peak value of the short circuit current,but cannot limit steady-state current.Finally,the influence of magnetization current on the saturation of iron core and the current limiting effect of SI-SFCL is analyzed.The principle of selecting the appropriate magnetization current is given.

关 键 词：饱和铁心型超导限流器 柔性直流输电技术 直流短路 电感铁心 

分 类 号：TM26[一般工业技术—材料科学与工程]