| Summary: | Loss of grid condition is one of the problem related to application of induction
motor as generator (IMAG) in distributed generation system. In grid-connected
distributed generation system, reactive power needed by IMAG can�t be supplied
by grid during this condition. Load sharing between IMAG and grid is stopped.
Overload operation of IMAG could be occurred by this condition. A reactive power
source can be applied to provide var needed by IMAG. One of device that can be
used is STATCOM.
This simulation aim is to determine the effect of STATCOM placement during
the loss of grid condition in grid-connected distribution generation system.
STATCOM has roles to control the voltage generated by IMAG and to provide
reactive power needed by IMAG.
Simulation is conducted in Simulink of MATLAB 2011a with Sim Power
System toolbox. Simulation is done by several schemes, i.e. loss of grid condition
with only capacitor connected as reactive power source, loss of grid condition with
STATCOM placed in the system, loss of grid condition in overload operation of
IMAG with STATCOM placed in the system, and load shedding simulation to
overcome overload problem of IMAG.
As a result, STATCOM can provide reactive power needed by IMAG and
control terminal voltage of IMAG during loss of grid condition in non-overload
operation of IMAG. Compared to capacitor bank, STATCOM can provide faster
stability of voltage generated by IMAG. Load shedding should be done before
critical time to keep IMAG operated in overload condition.
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