| Summary: | In the distributed generation (DG) system, the induction generator can be
connected in parallel with the grid. The connected loads such as passive or active
loads, e.g. induction motor. In certain condition, grid could be disconnected and
causing the islanding operation of DG system. The islanding performance of
induction generator feeding passive and active loads in various loading condition
could be investigated.
This research aims to investigate the induction generator performance
during grid-connected DG system and the islanding condition feeding passive and
active loads.
This research is simulated using SimPowerSystems in Matlab R2011a. This
simulation is performed using several schemes, i.e. grid-connected DG system,
grid-disconnected DG system without any capacitor and the islanding condition
with applying the capacitor. Each scheme is consisted of the various amounts of
resistive loads (R), induction motor, and resistive-inductive loads (R-L). Constant
torque induction generator is used in this research.
During the islanding condition, the induction generator requires the
reactive power that can be absorbed from the capacitor. During the islanding
condition at low loading, the rotor speed would be decreasing in responsible to
the constant torque as compared to before the loss of grid condition, and it was
followed by the increasing of voltage level at the load. Meanwhile, in the overload
condition with passive loads, the rotor speed would be increasing in responsible
to the constant torque as compared to before the loss of grid condition. At the
same time while loaded by the active loads, the induction generator can�t supply
the required active power load at full load or more of its own rating.
Keywords : Induction generator (constant torque), passive loads, active loads,
islanding, loss of grid.
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