Superconducting fault current limiter(SFCL)for fail-safe DC-DC conversion:From power electronic device to micro grid protection  

作　　者：Xiaoyuan Chen Mingshun Zhang Yu Chen Shan Jiang Huayu Gou Yi Lei Boyang Shen 

机构地区：[1]School of Engineering,Sichuan Normal University,Chengdu,China [2]Center for Fusion Science,Southwestern Institute of Physics,Chengdu,China [3]Sichuan Energy Internet Research Institute,Tsinghua University,Chengdu,China [4]Department of Engineering,University of Cambridge,Cambridge,United Kingdom [5]Clare Hall,University of Cambridge,Cambridge,United Kingdom

出　　处：《Superconductivity》2022年第1期14-26,共13页超导（英文）

基　　金：the National Natural Science Foundation of China[Grant No.51807128].

摘　　要：In DC micro grids and networks,DC-DC power converters having a large number of semiconductor-based power electronic devices are usually adopted to interconnect the renewable sources and flexible loads.Most of the semiconductor-based devices suffer from poor fault withstanding abilities,but conventional power electronic protection schemes have the bottlenecks of the time-delay,self-malfunction and mis-judgement.This paper presents a novel solution using the superconducting fault current limiter(SFCL)to protect a power electronic device and extend the usage to a micro grid.This SFCL is actually a self-triggering,recoverable,and passive current limiter,which does not involve any additional circuit hardware and software.Experimental investigations and simulation analyses clarify the feasibility of using this superconductor-based protection scheme to implement the self-acting fail-safe protection of DC-DC converters.Further system-level simulations explore the SFCL to suppress the over-current and stabilize the bus voltage of a photovoltaic based DC micro grid,particularly facing millisecond-level transients and faults.Our experimental and theoretical investigations lay some technical bases to establish a superconductor-semiconductor-coupled interdisciplinary application from the view from the applied superconductivity,to power electronics,and to micro grids.

关 键 词：Superconducting fault current limiter(SFCL) Self-acting over-current limiting Fail-safe power conversion DC-DC converter DC micro-grid Superconductor-semiconductor-coupled interdisciplinary research 

分 类 号：TM4[电气工程—电器]