Enhancement of transient stability on power system with the use of power System stabilizers

As we all know that most of the power systems are interconnected through long distance tie lines, in order to transfer a large amount of electric power. There are some constraints which affect to build new transmission lines, which are: limited availability of resources, strict environment and shortage of funds. Because of these constraints it necessitates the operation of transmission lines near or for short term on their thermal loading limits. Day by day the demand in electric power rapidly increases and is expected to continue growing; while growth of generation is restricted too, due to the same constraints mentioned above, this necessitates the generators to operate near their maximum stability limits. As a result of all these factors, power systems oscillations occurs and if not damped out these oscillations, the magnitude of these oscillations will go on increasing until loss of the system synchronism. So, for the improvement of power transfer capability within the safe stability limit it is necessary to enhance the transient stability of the power system. The objective of this paper is to investigate the enhancement of transient stability on power system by different types of power system stabilizers, which are: (I) Speed Input (II) Power Input (III) Frequency Input (IV) Del-P-Omega (V) Combination of frequency-electrical power input PSS and (VI) Speed-electrical power input PSS. The implementation and simulation carried out on the Single Machine Infinite Bus system.