Document Type : Research article


Department of Electrical Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz 61357-85311, Iran


Increase of the penetration level of distributed generation (DG) units in radial power distribution systems can increase the level of short circuits in these networks. Increasing the short circuit level can have destructive effects such as exceeding the tolerable current of the equipment as well as disrupting the protective coordination in the network. The active superconducting fault current limiter (ASFCL) is a new device that has the ability of fault current limiting using voltage series compensation. In this paper, the modeling of ASFCL and control strategies including fault detection and converter performance in normal and fault modes are discussed. Initially, by simulating a sample three-phase system with ASFCL, its performance in limiting the fault current is investigated. In the next step, three operating modes including normal mode, upstream fault mode, and downstream fault mode are proposed to achieve an adaptive FCL that solves the mentioned problems in the grid-connected microgrid. The simulation results confirm the proper performance of ASFCL modes in both fault current limiting and protective coordination of overcurrent relays in the network.


  • Fault current limitation continuously in the defined operation modes.
  • Dual function in current limiting and reactive power control in power systems using an active superconducting current controller.
  • Over-current relay coordination without changing the relay setting parameters.
  • Over-current relay coordination in the grid-connected microgrid with the voltage series compensation type active superconducting current controller.  


Main Subjects

[17] Short-Circuit Currents in Three-Phase a.c. Systems; Part 4: Examples for the Calculation of Short-Circuit Currents, IEC 60909-4, 2000.