Self excited induction generator for renewable energy applications to supply single-phase loads in remote locations

This paper explores methodologies to use a three-phase self excited induction generator (SEIG) for providing single phase power using appropriate renewable energy sources with suitable prime movers. It presents the general operating principle and steady-state analysis of a three-phase self excited induction generator (SEIG) having star/delta connected stator winding feeding three-phase balanced/unbalanced and single-phase loads. An approach based on symmetrical component theory is employed to derive the performance equations. Analyses are carried out on different capacitor topologies to establish their suitability for single-phase operation of the three-phase SEIG. The “fsolve” optimization tool of Matlab is used to obtain the excitation frequency and saturated magnetizing reactance. The theoretical analyses and simulations are validated by experimentation on a 7.5 kW, 415 V, 14.5 A, 50 Hz, four-pole, three-phase induction machine working as SEIG. The analyses brings out the comparison between different terminal capacitor connections and highlights the merits of one scheme over the other for making right choice while feeding single-phase loads. The strategies to be adopted for different sources in using SEIG for 1- phase loads are explained.