Abstract — With constraints on data availability and for study of power system stability it is adequate to model the synchronous generator with field circuit and one equivalent damper on q-axis known as the model 1.1. This paper presents a systematic procedure for modelling and simulation of a single-machine infinite-bus power system installed with a thyristor controlled series compensator (TCSC) where the synchronous generator is represented by model 1.1, so that impact of TCSC on power system stability can be more reasonably evaluated. The model of the example power system is developed using MATLAB/SIMULINK which can be can be used for teaching the power system stability phenomena, and also for research works especially to develop generator controllers using advanced technologies. Further, the parameters of the TCSC controller are optimized using genetic algorithm. The non-linear simulation results are presented to validate the effectiveness of the proposed approach. Keywords—Genetic algorithm, MATLAB/SIMULINK, modelling and simulation, power system stability, single-machine infinite-bus power system, thyristor controlled series compensator. NOMENCLATURE δ Rotor angle of synchronous generator in radians B ω Rotor speed deviation in rad/sec m S Generator slip in p.u. mo S Initial operating slip in p.u. H Inertia constant D Damping coefficient m T Mechanical power input in p.u. e T Electrical power output in p.u. fd E Excitation system voltage in p.u. do ' T Open circuit d-axis time constant in sec Sidhartha Panda is a research scholar in the Department of Electrical Engineering, Indian Institute of Technology, Roorkee, Uttaranchal, 247667, India. (e-mail: speeddee@iitr.ernet.in, panda_sidhartha@rediffmail.com). Narayana Prasad Padhy is Associate professor in the Department of Electrical Engineering, IIT, Roorkee India.(e-mail:, nppeefee@iitr.ernet.in) qo ' T Open circuit q-axis time constant in sec d x d-axis synchronous reactance in p.u. d ' x d-axis transient reactance in p.u. q x q-axis synchronous reactance in p.u. q ' x q-axis transient reactance in p.u. C X Nominal reactance of the fixed capacitor C P X Inductive reactance of inductor L connected in parallel with C. σ Conduction angle of TCSC α Firing angle of TCSC k Compensation ratio, P C X / X k = I. INTRODUCTION RADITIONALLY, for the small signal stability studies of a single-machine infinite-bus (SMIB) power system, the linear model of Phillips-Heffron has been used for years, providing reliable results [1]-[2]. It has also been successfully used for designing and tuning the classical power system stabilizers (PSS). Although the model is a linear model, it is quite accurate for studying low frequency oscillations and stability of power systems. With the advent of Flexible AC Transmission System (FACTS) devices [3], such as thyristor controlled series compensator (TCSC), static synchronous compensator (STATCOM) and unified power flow controller (UPFC), the unified model of SMIB power system installed with a TCSC, STATCOM and a UPFC have been developed [4]-[6]. These models are the popular tools amongst power engineers for studying the dynamic behaviour of synchronous generators, with a view to design control equipment. However, the model only takes into account the generator main field winding and hence these models may not always yield a realistic dynamic assessment of the SMIB power system with FACTS because the generator damping winding in q-axis is not accounted for. Further, liner methods cannot properly capture complex dynamics of the system, especially during MATLAB/SIMULINK Based Model of Single- Machine Infinite-Bus with TCSC for Stability Studies and Tuning Employing GA Sidhartha Panda and Narayana Prasad Padhy T World Academy of Science, Engineering and Technology International Journal of Energy and Power Engineering Vol:1, No:3, 2007 552 International Scholarly and Scientific Research & Innovation 1(3) 2007 scholar.waset.org/1307-6892/5161 International Science Index, Energy and Power Engineering Vol:1, No:3, 2007 waset.org/Publication/5161