Application of input shaping method to vibrations damping in a Type-IV wind turbine interfaced with a grid-forming converter

• Published in: Electric power systems research 2022-09, Vol.210, p.108083, Article 108083
• Main Authors: Avazov, Artur, Colas, Frédéric, Beerten, Jef, Guillaud, Xavier
• Format: Article
• Language: English
• Subjects: Grid-forming control; Inertial response; Input shaping; Torsional vibrations; Type-IV wind turbine; Vibrations damping
• ISSN: 0378-7796
• DOI: 10.1016/j.epsr.2022.108083

•Wind turbines interfaced to a grid-forming converter are strongly coupled to the grid.•This strong coupling results in the appearance of torsional vibrations during fast variations of the electromagnetic torque.•These vibrations can be effectively damped with an input shaping filter.•The only drawback of this damping method is the increased DC bus voltage variations.•DC bus voltage variations can be mitigated by reducing the performance of a grid-forming converter or de-activating the damping when the DC bus voltage reduces below a certain limit. Type-IV wind turbines can experience torsional vibrations in the drivetrain structure. This can lead to additional stress on turbine components. Vibrations are mostly induced by fast variations of the electromagnetic torque depending on the control of a back-to-back converter. A number of studies have presented methods to mitigate drivetrain vibrations. However, the research was dedicated to cases where the converter, interfacing a wind turbine to the grid operates in a grid-following mode. A wind turbine can also be interfaced to a grid-forming converter. In this case, there is a strong link between the electromagnetic torque and grid dynamics, so the abovementioned problem remains relevant. Recent works have introduced methods to damp torsional vibrations in grid-forming wind turbines. However, based on their results, there is still a lot to improve to achieve suppressed vibrations without significant impact on wind turbine’ electrical infrastructure. Therefore, this paper proposes an improved solution to effectively mitigate torsional vibrations in a grid-forming wind turbine. The solution relies on the input shaping method. Simulation results prove the effectiveness of the damping. In addition, the negative impact of the damping on system behavior with respect to other parameters is analyzed and options for its minimization are suggested.