The use of series compensators (SCs) in improving
voltage quality of isolated power systems is considered. The roles of
the compensators are to mitigate the effects of momentary voltage
sags/swells, and to control the level of harmonic distortions in the
networks. A control strategy for the SC is developed to regulate
power flow. This is achieved through phase adjustment of load terminal
voltage. It leads to an increase in the ridethrough capability
of loads to the voltage sags/swells. Validity of the technique is illustrated
through simulation.