Control Methods Used In Wind Energy Conversion System: A Review

This work presents a review on the control of torque and flux of six phase induction generator in a wind energy conversion system. The control methods used for grid connected asymmetrical six-phase induction generator in variable speed wind energy conversion system (WECS) are discussed. These involve a detailed model of the six phase induction generator. The six phase induction generator consist of two sets of three phase stator windings shifted by thirty electrical degrees. Efficient control strategies are applied to the generator in order to ascertain proper regulation of the generator torque and flux, which will in turn ensure generation of quality output power from the generator. The main aim of the work is to analyze the different control methods used that ensures continuous electrical generation during loss of one to three phases on the generator or converter sides of the wind energy conversion system. From the analyses, conclusion will be made on the control method that is more suitable for regulating the torque and flux and at the same time ensuring a minimal fluctuations that occurs due to loss of phases of the generators.