Shunt reactive VAR compensator for grid-connected induction generator in wind energy conversion systems

This work presents the control design for compensating reactive power requirement of induction generator (IG) in wind generation systems using STATic COMpensator (STATCOM). A mathematical model of IG is developed in synchronously rotating d-q-0 axis. The STATCOM is realised using voltage source inverter for which the switching function model is derived and employed here. Instantaneous p-q theory and symmetrical components theory are considered for reference current generation. The current control uses an optimal proportional controller designed using linear quadratic regulator (LQR) approach. Comparative analysis is also made between hysteresis current control and LQR. Simulation and experimental results indicate that the suggested control techniques make the supply power factor close to unity.