Abstract:
The power system is a dynamic system and it is constantly being subjected to
disturbances. It is important that these disturbances do not drive the system to
unstable conditions. For this purpose, additional signal derived from deviation,
excitation deviation and accelerating power are injected into voltage regulators.
The device to provide these signals is referred as power system stabilizer.
The use of power system stabilizer has become very common in operation of
large electric power systems. The conventional PSS which uses lead-lag
compensation, where gain setting designed for specific operating conditions, is
giving poor performance under different loading conditions. Therefore, it is very
difficult to design a stabilizer that could present good performance in all
operating points of electric power systems. In an attempt to cover a wide rangeof operating conditions, Fuzzy logic control has been suggested as a possible
solution to overcome this problem, thereby using linguist information and
avoiding a complex system mathematical model, while giving good performance
under different operating conditions. Using Matlab program