Excitation requirements for stand alone three-phase induction generator

Self-excitation in induction machines depends on an appropriate combination of speed, load and excitation capacitance. This paper presents a direct method derived from loop and nodal analysis to find the different criteria of maintaining self-excitation. Unlike available techniques, the inverse-Γ model for the steady-state equivalent circuit has been used. This is found to be of much assistance in the analysis. Besides determination of speed limits for fixed terminal parameters and capacitance requirements under varying speed and load, a method to test the possibility of self-excitation for known speed, load and terminal capacitance has also been presented