| Abstract |
This work presents a new dc energy generation system based on a three phase self-excited induction generator coupled to a force-commutated rectifier. This rectifier is switched in such a way that makes its input current fundamental component advanced with respect to the corresponding voltage, producing a capacitive characteristic on its terminals. This characteristic helps the self-excitation and improves the dc output voltage regulation, with respect to load variation, to the range of 1 to 2%, for some firing angle. Also, this capacitive effect increases greatly the output power limit, and allows the system to supply a constant dc output voltage over a reasonably wide range of rotor speed variation. The steady-state performance of the system is analyzed based on a simplified mathematical model, which is validated experimentaly. A study on the influence of the smoothing reactor, at the rectifier output, is presented and it is shown that the system can operate properly without this reactor, if there is no limit for ripple current in the load. |
