A zero axis robust model reference adaptive controller applied to voltage regulation in standalone self-excited induction generator under unbalanced loads

This paper deals with the development of a control system applied to voltage regulation of a micro hydro power generation system under unbalanced loads. This system consist of four wire three-phase grid, fed by three-phase three wires self-excited induction generator. The neutral conductor is created from the neutral point of star connection of excitation capacitors bank. The voltage regulation is performed through a four-legs distribution static synchronous compensator shunt connected to the AC bus. It is considered the employment of adaptive control techniques and the compensation of unbalanced load currents, which offers suitable voltage regulation in conditions of system's parameters variations such as, load connection and disconnection, and changes in induction generator unmodelled parameters, and voltage unbalance compensation, respectively. Experimental results were obtained to validate and demonstrate the good performance of the voltage regulation control system during unbalanced loads transient.