Modeling of a squirrel cage induction generator

Generating electrical power from wind energy is becoming increasingly important throughout the world. This fast development has attracted many researchers and electrical engineers to work on this field. Self excited squirrel cage induction generator (SEIG), which uses an excitation capacitor, is used widely to convert mechanical wind energy to electricity, due to their low cost, small size, no need of separate dc source and brushes. This paper proposes a new simplified model for small wind energy system consisting of: Induction generator, D-Statcom, excitation capacitors and loads. The model clearly describes the dynamic behavior of frequency and voltage of a SIEG supplied system during fault and isolating from a power system grid. Based on the proposed model, efficient analytical schemes for voltage and frequency control has been presented. These controllers are applied on a 33 kv wind energy system, using MATLAB- Simulink simulations. The simulation results verified the validity of proposed control schemes and models.