Design and simulation of synchronous generator excitation system using buck converter at motor generator trainer model LEM-MGS

The generator is the instruments which a method of converting mechanical energy into electrical energy. Energy conversion in generator is possible only if generator excitation exist. Generator excitation defines generator output voltage and reactive power. Synchronous generator are designed to run at specific speed to produce voltage at specific frequency. Generator excitation system is described in this paper. The system is based on a buck converter which control the dc excitation voltage by adjusting the duty cycle. Result of the simulation are obtained. This results shows the generator output voltage V
l
= 387V with dc excitation voltage from buck converter V
dc
= 84.5V. Duty cycle required is 37.2% at 15 kHz switching frequency. In this paper, a generator excitation system with PSIM model is used.