Performance evaluation of a nine-phase self-excited induction generator

This paper evaluates the performance of a self-excited nine-phase induction generator. The advantage of using Multi-phases(more than three-phases)are well known such as High power handling capability by dividing the required power between multiple phases, higher reliability, reduced harmonics and Fault tolerant. For a nine-phase machine, if failure occurs the machine can still operate since each three phase group can be made independent from each other. In this study, mathematical model is developed directly from the equivalent circuit of nine-phase self-excited induction generator by means of nodal admittance method. The stator of a conventional 1.5 kW, 4-pole, 50 Hz three-phase squirrel cage induction machine has been modified to nine-phase induction machine. The excitation is provided by 9 capacitors each rated 40 uF and 450 V