Multi-scale Transients Simulation and Analysis of the DFIG-based Wind Power Generation System Using Back-to-back Three-level NPC Converter

Wind power generation and multilevel converter are two of the most rapidly developing and promising technologies in recent years. This paper concentrates on the multi-scale transients modeling methods of the doubly fed induction generator (DFIG) based wind power generation system using back-to-back three-level neutral point clamped (NPC) converter. The averaged model and switching function model of the NPC converter are proposed to deal with the large-scale simulation of the wind power system. In addition, the overall control strategies is proposed to drive these models. The simulation results show the good accuracy and efficiency of the proposed average model and switching function model compared with the detailed model, and verify the effectiveness of the proposed control strategies.