Analysis of Dynamic Characteristics of Doubly-Fed Induction Generator Under Different Drivetrain Vibration Suppression Strategies

The rapid change of electrical control parameters under the interaction of machine and network is very likely to induce continuous torsional vibration of the flexible drive chain of wind turbine. Most of the existing torsional vibration suppression methods are based on the design of drivetrain dynamics equations, lacking consideration of grid stability. For this purpose the paper compares and analyzes the role of different dampers in terms of torsional vibration fatigue damage of the drivetrain and grid stability. First, a multi-degree-of-freedom drivetrain model considering the flexibility of key components is established, and the influence law of electrical control on the torsional vibration of the drivetrain is analyzed. Secondly, the electromagnetic transient simulation model of the doubly-fed induction generator (DFIG) is established based on Fatigue, Aerodynamics, Structures, and Turbulence (FAST) and MATLAB/Simulink to reflect the electromechanical coupling characteristics. Finally, the effects of different dampers on the fatigue damage and grid stability of DFIG under grid disturbances are discussed by applying the linear fatigue cumulative damage theory. This provides ideas for improving the operational reliability and grid stability of DFIG.