Dynamic operation of isolated self excited synchronous generator under static loads

Abstract

In the present work, the dynamic model for the synchronous generator expressed by the rotor reference frame was studied and the modeling of the stand-alone synchronous generator was created by MATLAB /SIMULINK software package with varied mechanical input power (104.93 and 5010KW) and loads (100KW and 100KVA) with constant excitation (6.36 and 8.84V). The sudden decrease in the mechanical input power was estimated by 20% of the mentioned values. In addition also, the sudden change in the load at constant speed (1800 rpm). These parameters were manually entered and the terminal voltage, current, output power, electromagnetic torque, load angle, and speed were measured as functions of time. The obtained results show changes in the terminal voltage, the current, the output power, the electromagnetic torque, the load angle, and speed were observed in case of resistive and inductive load except the current which was constant in case of inductive load at sudden decrease in the mechanical input power.