1. INTRODUCTION
In electric power generation, system
disturbances caused by load fluctuations result in
changes to the desired frequency value. Load
Frequency Control (LFC) is a very important issue in
power system operation and control for supplying
sufficient and both good quality and reliable power.
Power networks consist of a number of
utilities interconnected together and power is
exchanged between the utilities over the tie-lines by
which they are connected. The net power flow on tielines
is scheduled on a priori contract basis. It is
therefore important to have some degree of control
over the net power flow on the tie-lines. Load
Frequency Control (LFC) allows individual utilities
to interchange power to aid in overall security while
allowing the power to be generated most
economically.
The variation in Load frequency is an
index for normal operation of the power systems.
When the load perturbation takes place, it will affect
the frequency of other areas also. In order to control
frequency of the power systems various controllers
are used in different areas, but due to the nonlinearity
in system components and alternators, these
conventional feedback controllers could not control
the frequency quickly and efficiently