A Novel Method to Improve Transient Performance and Reduce Microgrid Disturbances Using Resistive Superconducting Fault Current Limiter and Auto Recloser

The increasing use of distributed generation sources in microgrids causes problems when a fault occurs, including an increase in the level of short-circuit current in the microgrid and consequently it causes disturbances in the system after fixing the fault. In this paper, using a novel method, the installation location and the optimal resistance value of the resistive superconducting fault current limiter in the microgrid are determined by considering the energy losses in the resistive superconducting fault current limiter, the requirements of low voltage ride through of the doubly fed induction generator and the interrupting capacity of circuit breakers. Also, a mathematical model of resistive superconducting fault current limiter is presented, which by simulating and placing it in the microgrid and applying various types of faults in different points of the microgrid, the effectiveness of the proposed resistive superconducting fault current limiter in reducing the short circuit current level of the microgrid, the impact of simultaneous use of resistive superconducting fault current limiter and auto recloser in significant decreasing of disturbances after Fixing the fault and improving the requirements of low voltage ride through of the doubly fed induction generator are approved. Finally, the analytical comparison of the proposed method with other studies conducted in this field is examined and proves its effectiveness.