Modeling and Vector Control of a Variable Speed Power Plant System Based on 5 MW DFIG

This paper introduces a modeling and vector control study of a variable speed power plant system based on the Doubly Fed Induction Generator (DFIG). The generator is connected directly to the grid by its stator and fed by bidirectional converters at its wound rotor. The Direct and Indirect Field Oriented Control (D/IFOC) are designed and compared. The stator powers are regulated by using Proportional Integral (PI) controller based on the pole compensation technique. The generator stator magnetic field is oriented along the d-axis. The Maximum Power Point Tracking (MPPT) algorithm is applied to the variable-speed wind turbine. The performance of the whole system is verified by utilizing the Matlab/Simulink software. From the simulation results, we can observe that the indirect vector control gives better performance than the direct vector in terms of tracking reference with an improved error static and reduced overshoot.