Steady State Performance Analysis of DFIG with Different Magnetizing Strategies in a Pitch-Regulated Variable Speed Wind Turbine

The integration of wind energy in the conventional grid is increasing day by day because of its abundant, affordable, and eco-friendly nature. With the advancements in wind technology, researchers develop adequate methods and algorithms to control and to make it an efficient and reliable source of energy. Their main goal is to tackle the limitations and issues of double fed induction generators (DFIG) by introducing robust controls. This research work presents a steady state model and detailed analysis of pitch-regulated variable speed DFIG based wind turbines. Two magnetizing strategies in stator flux-oriented vector control are discussed. Steady state performance of DFIG is achieved by magnetization of stator and rotor. Simulation results indicate that magnetization of DFIG through stator requires a higher stator current and a smaller rotor current than that required for rotor-based magnetization. Moreover, it is found that magnetization through stator implies better efficiency and lesser power loss as compared to the DFIG magnetized through the rotor.