ABSTRACT
Standalone, AC voltage, power generation systems with conversion of mechanical energy mainly use wound rotor synchronous generators (WRSGs) operated with Ÿxed speed, related to the reference frequency, e.g., 50 or 60 Hz. Power systems, like wind turbines or water plants, in which Ÿxed speed is di¢cult to obtain, can be adopted to standalone variable-speed operation and provide standard Ÿxed frequency AC voltage. Normalized voltage can be obtained by the use of full-range power electronics converter, as a coupler interface between variable-speed generator and an isolated load (Figure 23.1). WRSG or permanent magnet synchronous generator (PMSG) based systems can be equipped with an AC/DC diode rectiŸer with an optional DC/DC converter and a DC/AC converter (Figure 23.1a). In case of cage induction generator (CIG) (Figure 23.1b), back-to-back converter is necessary (controlled AC/DC and DC/AC). Power inverter, responsible for generation of standard AC voltage, in standalone mode requires an output Lf-Cf Ÿlter, to obtain high-quality generated voltage [1-3].
