Controllable DC power from self-excited induction generator through series connected single phase force-commutated rectifiers

Abstract

The generation of DC power by a capacitor self-excited induction generator is considered. The isolated phases of the induction generator feed the load through single-phase force-commutated rectifiers, which are connected in series. By controlling the ON-OFF instants of the switching devices the fundamental component of the rectifier input current is made to lag or lead the corresponding voltage, thereby producing reactive power, which either assists or opposes the VArs supplied by the existing capacitors. This is to maintain good DC voltage regulation under varying speed or load condition. Procedures are laid down to determine the capacitance requirement to maintain desired terminal voltage of the generator and the firing instants of the converter devices to meet the required output characteristics. Computed results are presented indicating the performance of the system. Limited experimental observations are also indicated.<>