Transient performance of three-phase self-excited induction generator during balanced and unbalanced faults

A generalised dynamic model of a delta-connected three-phase self-excited induction generator (SEIG) has been developed using d-q variables in a stationary reference frame. This model can handle symmetrical and unsymmetrical load and capacitor configurations, however, the SEIG performance during balanced and unbalanced faults has been studied, which include cases of extreme unbalance operation. SEIG behaviour has been investigated considering the effects of main and cross flux saturation for load perturbation, three-phase and line-to-line short circuit, opening of one capacitor, two capacitors and a single line at the capacitor bank, opening of single-phase load, two-phase load, and a single line at load. Simulated results are compared with experimental results and a close match between them validates the developed model.