IJSRP, Volume 6, Issue 7, July 2016 Edition [ISSN 2250-3153]
Onwughalu M.K, Nwosu N.O
This work involves stability study of a power system using Humpage modified model. Humpage modified model of power system is a single machine equivalent of power system, through transmission network connected to infinite busbar, with control. The target of every power engineer is to obtain hundred percent stability in power systems, but this has never been achieved. That is why, stability studies in power systems has been a topic of concern in everyday research. In this work, a three phase, double line and single line to ground faults were respectively inflicted on the generator busbar of the test system and cleared after sometime. Runge kutta 4thorder integration method was used to provide the evolution of the generator’s rotor angle() for each fault. Afterobtaining the electric power with the system equation, the steady state of the system was confirmed using Gauss-seidal load flow method. Afterwards, the line was compensated using static VAR compensator (SVC) and power system stabilizer (PSS) to enhance the stability and damping. Model simulation was done with sympowersystem in matlab environment and the results analyzed. The tendency of the rotor angle vs time curves was used to determine the in(stability) of the system. The transient stabilities of the single line to ground, double line to ground and three phase faults were simulated to study the effects of the power system stabilizers (PSS) and static VAR compensation (SVC) on the introduction of the different faults on three different occasions (a) when neither PSS and SVC is on during fault (b) when only PSS is on and (c) when both PSS and SVC are on.