Abstract:
Abnormal conditions in a power system create fluctuations to electrical quantities
such as voltage, frequency and current. Some of them may lead to fall of system
frequency and sometimes extreme abnormality leads to system blackout. Planned and
proper islanding may protect the system from complete blackout even in case of
extreme abnormalities. Islanding is the part of a power system consisting of generally
one or more power sources and load, that is islanding is a situation in which a portion
of the utility, comprising of both loads and generation sources, is isolated from the
rest of the system for some period of time but remained energized. In case of
emergency, islanding operation not only helps stabilizing a faulted system but also
supports power supplies to critical and important loads.
This thesis investigates the islanding technique, used to stabilize a power system
under a severe condition and prevent blackout, with a view to develop a principle of
the formation of islands. To do so the stability of a power system for different sizes
(in terms of MW) and natures of islands such as load rich or generation rich are
studied. The simulation results are compared to find a logical conclusion. In this
study Bangladesh Power System (BPS) is considered. Islands of different sizes and
natures are formed by disintegrating BPS. CYME PSAF (power System Analysis
Framework) has been used for the simulation purpose. The investigation clearly
shows that an island with higher inertia constant (H), performs better from the
stability point of view.
