Fuzzy control for back to back converter in DFIG for wind power generation

This paper describes the control of a utility connected double-fed induction generator (DFIG) for wind power generation systems (WPGS). Real and reactive powers (PQ) at the stator side of DFIG are strictly controlled to supply the power to the grid without any problems. In addition, DC voltage of the DC link capacitor is also controlled at a certain level with the conventional PI control of the real power, and the power quality at the grid connected to the rotor side of DFIG through the back-to back converter is maintained in a certain level with a PI control of the reactive power. In this paper, the control is realized using Fuzzy controller based on the stator-flux orientation control. The validity of the proposed algorithm is verified by the comparative study with the conventional PI controller under the balanced and unbalanced grid voltage condition.