Steady State Modelling of Regeneration and Self-Excitation in Induction Machines

Six modes of source-connected and self-excited induction generator operation including both voltage (VSI) and current (CSI) inverter systems are reviewed and compared. Equivalent circuits to represent each mode are presented and the use of the circuits to model steady state performance is illustrated. The analysis clearly shows the fundamental importance of main flux saturation in the self-excited cases as compared to its secondary importance in source-connected systems. General properties of regeneration and self-excitation are derived to illustrate the basic similarities and differences between the various modes. Experimental results which support the validity of the models used in the study are included.