ABSTRACT

Andi Abd. Halik Lateko, The Effects of Unified Power Flow Controller (UPFC) Installation on the South Sulawesi Electrical Power System Dynamic Stability  (supervised by Muhammad Tola and Rhiza S. Sadjad).

This is a research project to investigate the improvement of the South Sulawesi (INDONESIA) electrical power system dynamic stability by installing a Unified Power Flow Controller (UPFC) at the transmission lines. The South Sulawesi 150 kV system consists of 4 (four) generators and 23 buses is simulated as a plant using the MATLAB/Simulink software package. Three UPFC units are installed each at Barru-Pangkep, Soppeng-Sidrap and Bone-Bulukumba transmission lines, then a 0.01 p.u. of power up and down disturbance is applied at the Sengkang generator. The system response is observed through the changes of the four generator’s speed and rotor angle.

At Sengkang generator, for instance, without the UPFC, the disturbance creates a 0.00028 p.u. change of speed oscillating in 27.5 seconds, while after installing the UPFC units the change of speed decreases to 0.00025 p.u. converging into a steady state in 12 seconds.  For the same case, the rotor angle oscillates in 24 seconds without UPFC. The installation of UPFC units improves the system damping-ratio to converge the rotor angle change in 12.5 seconds only.  There is a steady state deviation of rotor angle, but it is far below the synchronization limit. 
   
It is concluded that the installation of UPFC units has improved the electrical power system dynamic stability by increasing the system’s damping ratio to reduce the electro-mechanic  oscillation.