Dependency of the output voltage and frequency of the isolated self-excited induction generator on the speed, load, and terminal capacitance causes certain limitations on its performance. This paper presents the performance of the induction generator under a wide range of varying conditions. It is found that the machine operates only in certain element ranges and that all generated currents and voltages are bounded. Furthermore, an optimal combination, for maximum power generation, of these elements exists. Such theoretical results are important as a guide in operating such machines. © 1990 IEEE