Soft and fast starting induction motors using controllable resistive type fault current limiter

This paper proposes a controllable resistive type fault current limiter for soft and fast starting of induction motors (IMs) based on the primary resistance method. Two methods of constant current and minimized torque pulsations starting for the proposed FCL are presented. A comparison is done and it is shown that method of minimized torque pulsations by the proposed structure leads to a fast and soft starting for IM. Analytical analyses are performed in details and simulation results using PSCAD/EMTDC software are involved to validate the effectiveness of the proposed FCL and its control methods for the soft and fast starting up of IMs.