Power System with PSS and FACTS Controller: Modelling, Simulation and Simultaneous Tuning Employing Genetic Algorithm

This paper presents a systematic procedure for modelling and simulation of a power system installed with a power system stabilizer (PSS) and a flexible ac transmission system (FACTS)-based controller. For the design purpose, the model of example power system which is a single-machine infinite-bus power system installed with the proposed controllers is developed in MATLAB/SIMULINK. In the developed model synchronous generator is represented by model 1.1. which includes both the generator main field winding and the damper winding in q-axis so as to evaluate the impact of PSS and FACTS-based controller on power system stability. The model 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, to avoid adverse interactions, PSS and FACTS-based controller are simultaneously designed employing genetic algorithm (GA). The non-linear simulation results are presented for the example power system under various disturbance conditions to validate the effectiveness of the proposed modelling and simultaneous design approach. Keywords—Genetic algorithm, modelling and simulation, MATLAB/SIMULINK, power system stabilizer, thyristor controlled series compensator, simultaneous design, power system stability. 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. Sidhartha Panda is a research scholar in the Department of Electrical Engineering, Indian Institute of Technology, Roorkee, Uttaranchal, 247667, India. (e-mail: [email protected], [email protected]). Narayana Prasad Padhy is Associate professor in the Department of Electrical Engineering, IIT, Roorkee India.(e-mail:, [email protected]) do ' T Open circuit d-axis time constant in sec 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 = t V Generator terminal voltage b E Infinite-bus voltage S V Stabilizing signal from power system stabilizer W T Washout time constant