Voltage control of a Self-Excited Induction Generator with an auto-tuned boost converter

Self-Excited Induction Generators (SEIG) are widely used in industries such as wind-turbines and mini hydro power plants. The stator side voltage of the SEIG can be controlled by adding an adjustable resistance connected to the rotor winding in series. The combination of a three-phase diode rectifier with a boost converter can provide a symmetric three-phase controlled resistance. So, the controlled resistance is connected to the rotor windings, and the stator voltage is maintained at the reference value by adjusting the rotor resistance. However, the parameters of system vary due to aging and the operation temperature of the system in different seasons. Besides, the SEIG is usually designed to work at stand-alone mode. Therefore, an adaptive loop is designed in the control planned to select the parameters of the PI-controller based on the operation point and system parameters.