Small Signal Stability Analysis as Impact of System Reconfiguration

Faulty condition caused by oscillation in a Java-Bali sub-system is investigated in this paper. The faulty condition is simulated by using power system simulation program to represent the real condition. The characteristic result of oscillation is analyzed by using the Prony method. The analysis of oscillation mode is done by decomposing the oscillation waveform into dominant frequency and damping ratio. System reconfigurations are developed by changing the generator supply direction and the setting of Power System Stabilizer (PSS). Each reconfiguration is simulated, and then the result is analyzed and compared to its default condition. Simulation result shows that by reconfiguring the direction of generation units to Middle-Java region and activating PSS of the generation unit can improve system stability.