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.
Highlights
For the modern electric power systems, one of the major challenges and demands is how to solve the continually increasing fault currents (Shuai et al 2015; Li et al 2015)
Considering the practical application of switch technology in the field of superconducting fault current limiters (SFCLs), a high-speed switch based on electromagnetic repulsion mechanism (ERM) has received lots of attention from research scholars (Lim et al 2010, 2014; He and Wang 2014)
The design scheme is described as that N0 = 15, N1 = 25, x = 10 mm, r = 30 mm, R = 20 mm, Ee = 220 V, Ce = 53000 μF, and the copper disc’s thickness is set as 5.4 mm
Summary
For the modern electric power systems, one of the major challenges and demands is how to solve the continually increasing fault currents (Shuai et al 2015; Li et al 2015). Considering the practical application of switch technology in the field of SFCL, a high-speed switch based on electromagnetic repulsion mechanism (ERM) has received lots of attention from research scholars (Lim et al 2010, 2014; He and Wang 2014) This kind of switch is adopted for the modified flux-coupling-type SFCL, and the switch’s operating principle and mathematical modeling will be stated . This switch is mainly consisting of a mobile copper disc, two fixed opening and closing coils. For the calculation of different eddy currents (i1, i2, i3...iN1), Eq (7) can be obtained
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