The PAR’S are used to control active andor reactive
power flow based on varying the phase angle between
the source and load voltages. The PAR controls the
power by inserting regulated quadrature voltage in
series with the line to neutral voltage of the series unit.
The inserted quadrature voltage is derived from phase
to phase voltage of the other two phases. There are
different PAR types, depending on their application
and construction: with, or without Load Tap
Changer(LTC), Delta /Wye, or WyeNye exciting unit
configuration, with or without voltage regulating
winding. They also differ by power and voltage ratings
to provide different phase angle regulation, and hence
power flow. The one described in this paper is of
conventional type with Series Unit secondary winding
connected in Delta, and WyelWye connected windings
of the Exciting Unit with grounded neutral. The Load
Tap Changer is located on the secondary Wye
connected winding of the Exciting unit, and is used to
control the magnitude of the quadrature voltage, used
to shift the Load phase to ground voltage, from the one
of the Source side.
The power flow between the Source and Load side