Stability of Multi-Machines System

Abstract

Stability study is the most important issue in power system; which keep the system secure and continuous operation. Stability of power system means the ability of the synchronous generators to be in synchronism when small or large disturbances occur in load or network of power system. If one of the generators losses the synchronism the other generators will be overloaded, which in turn leads to system separation and in worst case to blackout. This project concerned to study and analyzes the small signal and transient stability problem for multi machines system. The nonlinear equations which represent the system have been linearized, then state space model is derived in order to study and analysis the dynamic performance of the system. The two area system (four machines-ten busbars system) has been taken as case study. The AVR system causes negative damping of oscillation; so that the PSS was designed and added in optimal location by using participation factor technique to increase the damping ratio. The eignvalue analysis and time domain simulation are carried out to analyze the system stability; finally the responses and results have been represented for several cases by using time domain simulation.