Design of a series compensator for enhancing power quality during the starting of an induction motor

Mitigation of voltage-sag effects on loads due to the starting of an induction motor is considered. If a series compensator is connected upstream of the motor, the large transient current caused by the switching event could damage the compensator or deplete the energy stored in it. Maximum motor-starting current and the required energy during the starting process are derived from which the ratings of the compensator can be determined. Simulation verifies the analysis is effective and the compensator is shown to be able to maintain good supply quality during the motor-start event