AN APPARATUS AND METHODS FOR CONTROLLING OPERATION OF A SINGLE-PHASE VOLTAGE REGULATOR IN A THREE-PHASE POWER SYSTEM

摘要

Provided are methods for controlling operation of a voltage regulator of asingle-phase of a three-phase power system to regulate a measured voltage. Oneof the methods includes recording a first elapsed time between detecting afirst excursion of the measured voltage from an in-band area to an out-of-bandarea, and a first return of the measured voltage to the in-band area. Themethod also includes recording a second elapsed time period (dip period)between detecting the first return and a second excursion of the measuredvoltage from the in-band area to an out-of-band area. If the second elapsedtime period is less than a predetermined dip time period, causing a tapposition change of the voltage regulator upon expiration of a countdown periodinitiated upon detecting the first excursion, thereby adjusting the measuredvoltage to the in-band area while allowing a voltage drop of limited length.