Generalized model for investigating the attributes of a six-phase self-excited induction generator over a three-phase variant

Abstract

Six-phase self-excited induction generator (SEIG) comparative to an equivalent 3-phase counterpart is investigated in this study. A novel unified, stationary reference frame, dual d-q model is developed to simulate both SEIG variants. Operating conditions are arranged as short shunt compensation connection of SEIGs with no-load, static RL, and dynamic loading. Results demonstrate that 6-phase SEIG supplies full-load voltages with 21% to 45% lower THDs and incurs 5.5% to 9.8% lesser full-load copper losses across different loads than the 3-phase SEIG. This also reflects in the efficiencies of 2 variants, as the 6-phase SEIG maintains consistently better efficiency. Six-phase SEIG also gives stable performance with unbalanced loading. Experimental validation of the results is achieved on an open-end stator winding squirrel-cage induction machine operated as 3- and 6-phase SEIG. Findings of this study verify the theoretically perceived benefits of high-phase SEIGs in an orderly manner.