Modeling of Wind Turbine-Self Excited Induction Generator System with Pitch Angle and Excitation Capacitance Control

The three-phase self-excited induction generator (SEIG) plays a basic rule in sources of renewable energy, such as wind turbines (WT). His main defect is poor regulation of output voltage and frequency under variable rotor speed and load conditions at stand-alone and isolated area operation mode. In this paper, a complete dynamic model of the SEIG-WT system is performed to analyze and study the system performance under transient and steady-state conditions. This dynamic model considers into account the effect of saturation in magnetizing inductance, cross-coupling magnetizing inductance, stator, and rotor leakage inductances, iron core resistance, and mechanical (friction and windage) loss resistance, as well as the effect of stray load resistance, are considered in this model.New analytical formulas are used to accurate calculation of minimum and maximum values of excitation capacitance and generator rotor cut-off and maximum speed. The results of the dynamic model are partially compared with experimental results, and accurate agree are shown.