Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2011.414.425IranianM.E.ZabihinejadAmin32011113Automatic voltage regulator AVR is designed for synchronous generator to keep the terminal voltage of the generator to the rated value. This study presents a linear mathematical model of the synchronous generator to simulate the electrical section of a gas power plant and do the functional test of a real excitation system. The complete system is mainly included synchronous machine, governor, gas turbine and transmission line. The simulator allows to analyze and verify tuning and performance of excitation system with limiter circuits and Power System Stabilizer (PSS). The method is specially developed for transient analysis of synchronous machines given by linear differential equations. Details such as the exciter circuit, turbine and governor systems of a synchronous machine which is linked to an infinitive bus through two equivalent lines are given and this system is implemented in SIMULINK. To build the communication with excitation cubicle, Simulink software was linked to LabVIEW (Laboratory Virtual Instrument Engineering Workbench) by Simulation Interface Toolkit (SIT Server).]]>Weedy, B. and B. Cory,1999Clark, C.,2005Hassan, A.R., T.S. Martis and A.H.M.S. Ula,1994Jiang, L. and Q.H. Wu,2002Leon-Morales, J., K. Busawon and S. Acha-Daza,2001Loukianov, A.G., J.M. Canedo, V.I. Utkin and J. Cabrera-Vazquez,2004Salem, M.M., O.P. Malik, A.M. Zaki, O.A. Mahgoub and E.A. El-Zahab,2003Wen, J.Y., S.J. Cheng and O.P. Malik,1998Werner, H., P. Korba and T.C. Yang,2003Machowski, J., J.W. Bialek, S. Robak and J.R. Bumby,1998Krause, P.C., O. Wasynczuk and S. Studhoff,1986Damm, G., R. Marino and F. Lamnabhi-Lagarrigue,2004