A study on Practical Impedance of Superconducting Fault Current Limiter on Bus Tie in a Power Distribution System

Abstract

-This paper analyzed the selection of practical impedance of Superconducting fault current limiter (SFCL) on bus tie in a power distribution system. Generally, the parallel operation of main transformer offers a number of advantages. However, when a fault occurred in the parallel operation of main transformer, the fault currents could exceed the capacity of conventional protective device and might generate protective coordination problems. To solve these problems, the SFCL has been studied as the attractive device. Especially, in power distribution system on bus tie with SFCL, the effect of the resistance of SFCL could decrease the increased fault currents and could meet the capacity of conventional protective devices by them. Also, they could solve the protective coordination problems. Therefore, we analyzed the practical impedance of SFCL on bus tie in a power distribution system using PSCAD/EMTDC.

Fault Current Limiters in Power Systems: A Comprehensive Review

“…Fault current limiters (FCLs) are considered serious candidates to be inserted into electrical grids in order to prevent short-circuit damage and the inevitable upgrading of the system equipment. Mainly, two types of FCLs are extensively applied in power systems: non-superconducting [10][11][12][13] and superconducting [14][15][16][17][18][19]. Superconducting FCLs have been applied in different parts of the power network such as renewable power generation, distribution generation, transmission system, distribution network [18,[20][21][22][23][24][25][26][27][28][29][30].…”

Non-Linear Control for Variable Resistive Bridge Type Fault Current Limiter in AC-DC Systems

“…line curr = T 0 |∆i|dt (18) where ∆V DC , ∆P, and ∆i represent the deviation of DC link voltage, active power, and line current, respectively. Since the performance index is the total deviation of the signals over the simulation period T, a lower value indicates better system performance.…”

“…Thus, fault current limiters can evidently mitigate the current interruption stress on circuit breakers and avoid possible serious damage to the power electronic converters. Superconducting [16][17][18][19][20][21] and non-superconducting [22][23][24][25][26][27][28][29] fault current limiters (FCLs) have been widely applied in power systems to protect them against high currents as well as improve transient stability.…”

Characteristics of the SFCL by turn-ratio of three-phase transformer

“…So the SFCL will not have any loss in the operations and it was allowed to limit only the initial fault current. In this case, the power burden of a superconducting element was reduced, we can create economic benefits by expanding the cycles exchanging of superconducting element [4][5][6][7][8][9]. In this paper, we analyzed the characteristics by turn-ratio in the three-phase transformer which applied an SFCL to the neutral line of a transformer when the line-to-ground fault happens.…”