ABSTRACT

Veny Ponggawa, A Study on the Synchronous Generator Transient Stability (supervised by Muh. Arief and Rhiza S. Sadjad )

The purpose of this research is to develop a fairly accurate numerical model of an electrical power synchronous generator. A 25 MVA generator currently operating in the Lahendong (North Sulawesi, INDONESIA) power plant is taken as a sample case.

The generator is equipped with 2 (two) control systems: (1) the Automatic Voltage Regulator (AVR) and (2) the Load Frequency Control (LFC) to regulate the line voltage and line frequency respectively due to the load variations.

The system has been given load variations ranging from +0.2 p.u. to +0.6 p.u. The maximum overshoot of the time-response is around 43% for the line frequency and 350% for the line voltage, while the settling-time is around 4.30 seconds for the line-frequency and ranging from 0.79 to 3.85 seconds for the line-voltage. The steady state error is ranging from 0.0096 to 0.0288 p.u. for the line-frequency and from 0.0209 to 0.0627 p.u. for the line-voltage.

A standard proportional (P) controller design method has been applied by setting up the amplifier gain up to 0.5 Kcr (the critical value according to Ziegler and Nichols). The steady state error is improving, but the maximum overshoot and the settling-time of the time response is worse than before.