COORDINATED CONTROL OF PSS AND TCSC ON DAMPING IN POWER SYSTEM USING MATLAB SOFTWARE

Abstract

This paper will discuss about the damping occurs in the power system. Power systems are interconnected
through the long distance tie lines. To transfer or exchange a large amount of electric power, transmission lines are
used. For maintaining reliability and stability, the rotor angle stability is essential. The complete simulation of WSCC9
bus system with PSS and TCSC is shown in this paper. Generic PSS is used in all the three generators. Simulation is
carried out in the MATLAB 2012 software. When electrical quantity is suddenly changes then mechanical quantity
cannot change instantaneously because of its moment of inertia. Therefore in a small duration , the rotor of generator
feels an oscillation that have to damp. By using PSS, local area mode and inter area modes of oscillations are effectively
damp. But sometimes PSS fails to damp inter area modes of oscillation. By using coordinate control of PSS and TCSC
controller, Local area and inter area modes of oscillation can be effectively damp.