Stand alone self-excited induction generator with reduced excitation capacitors at fixed speed

This paper proposes a reduction of the self-excitation capacitance of induction generators by using an associated Two-Stage Matrix Converter (TSMC). This association regulates load frequency and load voltage in addition to an improved generated voltage. The resistive load affects the self-excited induction generator (SEIG) voltage, but inductive loads cause poor regulating voltage. This trend is due to the opposition between the inductive load reactance and the reactance of the self-excitation capacitors. The TSMC supplies a sinusoidal current with reduced harmonic content. Thus, the matrix converter operates as a resistive load across the IG terminals, improving regulation of the generated voltage. In this text it is included some simulation results of a 1 kW SEIG dynamic model connected either directly to the load or through the TSMC. The simulations are compared with the TSMC prototype for a similar induction machine to prove the effectiveness of the proposed control.