title: Conceptual design of a high-speed electromagnetic switch for a modified flux-coupling-type SFCL and its application in renewable energy system.
abstract: The modified flux-coupling-type superconducting fault current (SFCL) is a high-efficient electrical auxiliary device, whose basic function is to suppress the short-circuit current by controlling the magnetic path through a high-speed switch. In this paper, the high-speed switch is based on electromagnetic repulsion mechanism, and its conceptual design is carried out to promote the application of the modified SFCL. Regarding that the switch which is consisting of a mobile copper disc, two fixed opening and closing coils, the computational method for the electromagnetic force is discussed, and also the dynamic mathematical model including circuit equation, magnetic field equation as well as mechanical motion equation is theoretically deduced. According to the mathematical modeling and calculation of characteristic parameters, a feasible design scheme is presented, and the high-speed switch's response time can be less than 0.5 ms. For that the modified SFCL is equipped with this high-speed switch, the SFCL's application in a 10 kV micro-grid system with multiple renewable energy sources are assessed in the MATLAB software. The simulations are well able to affirm the SFCL's performance behaviors.
authors.affiliation: School of Electrical Engineering, Wuhan University, NO. 8, Donghu South Road, Wuchang District, Wuhan, 430072 Hubei China.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.affiliation: School of Electrical Engineering, Wuhan University, NO. 8, Donghu South Road, Wuchang District, Wuhan, 430072 Hubei China.
authors.forename: Hongkun
authors.initials: H
authors.lastname: Chen
authors.affiliation: School of Electrical Engineering, Wuhan University, NO. 8, Donghu South Road, Wuchang District, Wuhan, 430072 Hubei China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.affiliation: State Grid Yichang Power Supply Company, Yichang, 443000 China.
authors.forename: Zhengyu
authors.initials: Z
authors.lastname: Shu
authors.affiliation: China Electric Power Research Institute, Wuhan, 430074 China.
authors.forename: Huiwen
authors.initials: H
authors.lastname: He
authors.affiliation: State Grid Hubei Electric Power Research Institute, Wuhan, 430077 China.
authors.forename: Xin
authors.initials: X
authors.lastname: Shu
keywords: Conceptual design; Electromagnetic repulsion mechanism (ERM); Flux-coupling-type SFCL; High-speed switch; Micro-grid system