Coupling DFIG-Based Wind Turbines with the Grid under Voltage Imbalance Conditions

A smooth coupling is implemented between the grid and doubly fed induction generator-based wind turbines (DFIG-WTs) during voltage imbalance. The nonlinear characteristics of a grid-connected DFIG-WT system may increase stresses on mechanical electrical components turbines. Such difficulties are greatly increased periods Consequently, in this paper, new control scheme proposed to regulate DFIGs order support connection In synchronization mode, positive sequence rotor dq-axes currents regulates stator q-axis EMF that be synchronized with grid-side voltage. phase difference voltages compensated by adjusting d-axis zero. Under normal conditions, PR controller used dampen negative currents. PI current controllers tuned DFIG currents, while under operation conditions. Experiments performed verify robustness