ABSTRACT

Sanatang, Linear Quadratic Regulator Method to Improve the Frequency and Voltage Stability of the Sulselbar Electricity System's Dynamic Load (supervised by Nadjamuddin Harun and Rhiza S. Sadjad).

The study is to investigate the effects of dynamic load on the frequency and voltage stability of an interconnected electrical power system, and to design a state variable feedback to control the system. The case of the electrical power system in the South and West Sulawesi (Sulselbar) INDONESIA interconecting 7 (seven) generators is analyzed and the linear quadratic regulator (LQR) method is used as the design tool.

The results show that the frequency and voltage stability of the system is significantly improved by implementing the feedback gain matrix K computed using the LQR method. The transient response of the Bakaru generator, for instance, is damped as large as 1,05X10-3 pu and 2,50X10-3  pu and the steady state is reached 1,2 seconds and 1,8 seconds faster for frequency and voltage respectively. The similar cases are shown for other generators (Tello, Suppa, Sengkang, Pinrang, Mamuju and Palopo).