الفهرس 
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Abstract
Power system contingency analysis techniques are on¬line application techniques. Its validity achieved as they
could give an accurate quick view for system after sudden or
orderly system network contingency occurrence. This should be done with less computational time, storage, and size.
This research introduces three fast and reliable
techniques for on-line contingency analysis applications based on three different princaples.The first technique is an approximate one, called a
linear decoupled contingency analysis algorithm. It is a
simple non-iterative algorithm derived from the approximate
DC loadflow method. It implements the linear relations between
system bus injected active and reactive powers with bus phase
angle and voltage magnitudes coupled together in one
algorithm. The technique takes into consideration the second
order changes in both active and reactive power relations, if
the system contingencies occur. The second order terms highly improved the technique results compared with any other previous technique proposed on the same bases.
The second technique is an exact iterative contingency analysis algorithm. It is a trial to handle the exact
contingency problem to introduce an on-line fast technique