Estudo de um gerador monofásico utilizando uma máquina de indução trifásica

Abstract

This article studies a single­phase, self­excited and self­regulated induction machine using capacitors in series and parallel with the single­phase load. It also studies the harmonics present in the generation system and the possible problems presented by the type of generator connection. Using current and voltage oscilloscopes with isolated tips on each capacitor, after analyzing the system when the machine is primed and in permanent regime, the presence of harmonics was detected during the connection of the load, with third and fifth harmonic frequencies being the most apparent. An off­set was also identified in the capacitors when this momentary load was removed from the system. As there were no internal problems in the machine or with the connections, the off­set was solved with resistors connected in parallel with each capacitor in the link. As will be shown, possible solutions to the system's problems are to insert a controller with inductor switching to control the reactive power present in the machine, or just to determine a possible relationship between the system's capacitors that will give the best results.