Abstract:
Conventional droop control is the commonly used method for obtaining proportional sharing of real
and reactive power in an autonomous microgrid. The distributed generators share power with respect
to their ratings in an autonomous microgrid. By adopting conventional droop control, sharing of true
power becomes equal. However, sharing of reactive power is not equal. Reason for this inequality is
the resistive impedance of the feeder, unequal feeder lengths, and uneven or random distribution of
load in the power system network. Unequal reactive power sharing is not acceptable as it results in
heavy loading of distributed generators with small ratings. These small rated generators that are
close to large loads are mostly affected. Unequal reactive power sharing also lead to uneven voltage
profile, increases circulating current and cascaded tripping. Here a strategy which improves reactive
power sharing and removing its dependency on communicationis used. In this a nominal voltage of
each VSI adjust itself thus updating the reference voltage each time furthur enhancing the sharing of
reactive power is utilized. Significant enhancement of this wattles power is obtained compared to a
strategy which use fixed nominal voltage. Also in the presence of a load locally placed the
mentioned effective strategy could maintain a stable voltage along with enhancing wattles power.
This method reduces the reactive power sharing error by keeping the voltage stable. The simulation
of the system done through MATLAB SIMULINK
