International Journal of Innovative Engineering, Technology & Science

DETERMINATION OF CRITICAL CLEARING TIME IN MULTI- MACHINE TRANSIENT STABILITY
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DETERMINATION OF CRITICAL CLEARING TIME IN MULTI- MACHINE TRANSIENT STABILITY

Publication Date : 30/10/2022


Author(s) :

Ogbu, V. I., Okorie, U. I. , Kenneth, C. B..


Volume/Issue :
Volume 5
,
Issue 2
(10 - 2022)



Abstract :

Abstract In this paper, multi-machine transient stability under severe disturbances was analyzed and critical clearing time was determined. Transient system stability, a term applied to electric power systems denotes the behavior of various synchronous machines when the system is subjected to disturbances. An 11-bus network, consisting of three generator buses, five load buses and fourteen transmission lines was analyzed using MATLAB software. Power- flow analysis was carried out using Newton-Ralphson method and the network was thereafter reduced by eliminating all non-generator buses from the admittance matrix. Three-phase fault on transmission circuit with delayed faults clearing were considered for stability threats. During fault condition, if the machine’s rotor angle swings around 90o and decays very rapidly, then the generator is considered stable, but if the rotor angle goes beyond 180o in the first cycle, it is considered unstable. The results indicated that the system is stable, unstable and critically stable when the fault clearance time were, 0.4, 0.8 and 0.524 seconds respectively. Critical clearing time is used in setting the circuit breakers for power systems operations.


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