ABSTRACT

MUHAMMAD AMIN. Electrical Power System Performance Analysis Based on the Frame of Reference, a Case Study of Tello Power Generation System in South Sulawesi (supervised by Muhammad Arief and Salama Manjang).

The performance of electrical power systems depends on the transient stability of their generators. Most studies on the transient stability were based on the first-swing stability rather than multi-swing stability. The first-swing stability studies usually modeled a generator in a reasonably simple way as an internal transient voltage source in series with its transient reactance. The effects of excitation systems and the turbine’s governor control systems were not put into consideration. If the system is stable in 1 (one) second interval after a short-circuit fault or other major faults, then the system is regarded as having a stable transient performance.

The machine’s angular swing during and after the fault and the critical clearing time are 2 (two) major factors indicating the generator’s relative stability. Both H-constant and sub-transient reactance Xd of each generator have a direct effect on the machine stability. The model of generator can be simplified by a transformation of stator’s phase-variables a, b and c into new variables based on the frame of reference in the rotor and moving with it. This transform is derived from the well-known dqn-axes theory.

In this research, the stability of Tello power generation system in South Sulawesi, Indonesia, has been analyzed using the simplified model of generator derived from the transformation of stator’s phase variables based on the frame of reference as described above. The results show that bla….bla…..bla ……………………….(sebutkan hasil kuantitaf-nya, berupa angka-angka).  It is concluded that the stability of Tello power generation system depends more on the critical clearing time than the machine’s angular swing.