Static bifurcation in induction generators

Summary form only given. A simplified approach to studying the phenomenon of self-excitation in induction generators, based on the concept of static bifurcation and the q-d equivalent circuit equation in the synchronous reference frame, is proposed. This approach provides the necessary framework for identifying the boundary of possible self-excitation for a generalized load comprising both resistive and inductive loads. Example of these boundaries are shown. The limitation of capacitive self-excited induction generator operation has been determined, and suggestions as to how constant voltage and frequency power can be attained have been derived on the basis of the bifurcation fields. For the cases in which the reactive power is provided from a pulsewidth-modulated inverter, it has been shown how the switching frequency and the effective value of the inverter capacitance can be appropriately and structurally manipulated to obtain constant voltage and constant frequency power from the generator