Performance comparison of two different filter design approaches for torsional vibration damping in a doubly fed induction generator-based wind turbine

Abstract

Conventional band-pass filter (BPF)-based damper is commonly employed to damp the vibrations in the drive train caused by turbulent winds. However, for the case of grid disturbances or faults resultant torsional vibrations, the performance of the BPF-based damper can be compromised because of the potential low-frequency vibration modes from grid side. To overcome this shortcoming, low-pass filter (LPF)-based torsional damper was proposed in this study. The theoretical analysis of the two torsional damper was assessed in frequency domain. Performance comparison of the two dampers was conducted through simulations and the proposed LPF-based torsional damper outperformed the conventional one in the presence of unexpected low-frequency vibrations. Results also showed that retuning the BPF by decreasing the quality factor can restore the intended performance of torsional damper.

Keywords

• vibrations
• damping
• asynchronous generators
• wind turbines
• band-pass filters
• turbulence
• Q-factor
• performance comparison
• filter design approaches
• torsional vibration damping
• doubly fed induction generator-based wind turbine
• conventional band-pass filter-based damper
• drive train
• turbulent winds
• grid disturbances
• faults resultant torsional vibrations
• BPF-based damper
• low-pass hlter based torsional damper
• LPF
• frequency domain
• unexpected low-frequency vibrations
• quality factor
• torsional damper