Provided are methods for controlling operation of a voltage regulator of a
single-phase of a three-phase power system to regulate a measured
voltage. One of the methods includes recording a first elapsed time
between detecting a first excursion of the measured voltage from an
in-band area to an out-of-band area, and a first return of the measured
voltage to the in-band area. The method also includes recording a second
elapsed time period (dip period) between detecting the first return and a
second excursion of the measured voltage from the in-band area to an
out-of-band area. If the second elapsed time period is less than a
predetermined dip time period, causing a tap position change of the
voltage regulator upon expiration of a countdown period initiated upon
detecting the first excursion, thereby adjusting the measured voltage to
the in-band area while allowing a voltage drop of limited length.