A New Method Voltage and Frequency Regulation of Self-Excited Induction Generator Operating in Stand Alone

This paper proposes a new method to analyze the steady performance of a stand-alone self-excited induction generator (SEIG). The entire system consists on a three-phase induction generator excited with three capacitors-bank and an inductive load. The non linear equations are firstly developed by applying the nodal current approach to the per-phase induction generator, the eventual set of equations is solved using the Newton Raphson algorithm. Simulation results obtained by the proposed method revealed an important effect of several parameters on the self-excitation process. In fact, the load impedance, the prime mover speed and the excitation capacitance value have a direct impact on the terminal voltage and the output frequency of the induction generator. Based on these results, a simple voltage regulation strategy is suggested in order to operate at a fixed power range within tolerable voltage limits. Key-words:Induction generator, self-excitation, capacitors-bank, voltage regulation, output frequency.