ABSTRACT

YUSRI SYAM AKIL. Fuzzy Logic Controller Optimization of Thermal Plants in the South Sulawesi Interconnection System (supervised by H. Nadjamuddin Harun and Yustinus Upa Sombolayuk).

This research develops a method to optimize the output of thermal electrical power plants by considering the transmission losses and the projection of peak load and electrical energy growth in the South Sulawesi interconnection system for the period of 2005-2014. The optimization method is based on the principle of Fuzzy Logic Controller with a patron derived from the output of La Grange method. The least-square method determines the input-output characteristic equation, B-coefficient provides the transmission losses and the system’s initial condition is obtained from the power flow study using the Newton-Raphson method. Numerical data for the computation are taken from all thermal plants operated by PT. PLN (Persero) in South and Southeast area of Sulawesi, at the peak loading time (18:00-22:00 WITA) of October 30, 2004. The optimization method has reduced the production cost up to 0.8 % or Rp. 763, -/kWh of energy unit cost in average. On-grid supply system model based on technical data of the current and committed future capacity is developed using LEAP to make a forecast. The projection shows that the peak load and energy growth require additional power plants with the total capacity of 588.92 MW in the period of 2005-2014 to provide reserve margin of 30%. As an alternative, the capacity of the power plants can be increased annually by considering the transmission losses at the 150 kV bus of Tello power plant.