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Enhancing Stability of Multi-Machine IEEE 9 Bus Power System Network Using PSS

Divya Prakash, Er. Vinay Kumar Tripathi

The purpose of this paper is to study and investigate the stability analysis of multi-machine nine bus bar power system network using power system stabilizer. Power system is subjected to sudden changes in load levels. Stability is an important concept which determines the stable operation of power system. The classical three-machine nine-bus system is the simplest model used in studies of power system dynamics and requires of minimum amounts of data. Hence such studies can be connected in a relatively short time under minimum cost. In general rotor angle stability is taken as index, but the concept of transient stability, which is the function of operating condition and disturbances deals with the ability of the system to remain intact after being subjected to abnormal deviations. A system is said to be synchronously stable (i.e., retain synchronism) for a given fault if the system variables settle down to some steady-state values with time, after the fault is removed. In this paper, we have created a three phase fault at time 0.25 seconds at bus 5 and cleared at time 3.7 seconds. On implementing PSS, the machine achieved a better response in terms of power swing when compared with initial condition. A MATLAB simulation has been carried out to demonstrate the performance of the multi-machine nine-bus system.