Operation of an Induction Generator Controlled by a VSI Circuit

The paper analyses the operation of an induction generator (IG) controlled by a voltage source inverter (VSI) circuit. This circuit performs both voltage and frequency regulation. The IG frequency is controlled by keeping constant the VSI synchronous frequency. For the IG voltage regulation two cascaded regulators are used, which have as reference the line voltage and the VSI DC voltage, respectively. The VSI also ensures a smooth voltage buildup during the start-up process. Simulations are made in order to investigate the reliability of such a configuration. In addition, experiments were carried out using a laboratory-scale prototype.