Abstract:
The abc-to-dq0 based voltage detection technique is
commonly employed in static transfer switch (STS) applications,
which are targeted to protect sensitive loads against variety of
disturbances. The technique is quite fast and precise especially in
case of balanced disturbances. However balanced events seldom
occur as compared to unbalances in supply system. Also there is
every possibility that sensitive load may comprise of combination
of single phase and three phase loads and therefore to offer a ride
through capability during most of events, it is equally important to
maintain good power quality at both single-phase and three-phase
levels. The effectiveness and the capacity of the detection scheme
are analyzed against common disturbances, routine operations of
power system, under balanced variations which are within
acceptable limits and against unbalances of hybrid nature
(simultaneous presence of the sag and swell events). The impact of
control elements on the detection process is also discussed.
