Abstract
With a less stable future electricity grid in mind, grid-induced turbo-generator vibrations are very likely to gain importance. Today there is however only limited attention paid to the interaction between electrical grid-induced excitations and mechanical vibrations of the turbo-generator shaft line. This paper describes the execution and results of a field measurement campaign that was initiated due to the appearance of subsynchronous generator vibrations in a power plant in the close vicinity of an electrical arc furnace. The measurements consist of both radial and torsional vibrations as well as of electrical parameters, in order to pinpoint their mutual interaction. A clear correlation between the electrical grid disturbances and the mechanical vibrations of the shaft line is revealed, indicating that excitations external to the power plant itself must be taken into consideration in root cause analyses of turbo-generator vibrations.
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Notes
- 1.
Electromagnetic compatibility (EMC)—Part 4–30: Testing and measurement techniques—Power quality measurement methods.
References
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Appendices
Appendix A
Rotordynamic Model
The radial and torsional eigenmodes of the shaft train were calculated using Madyn 2000 and shown in the table below. The radial eigenfrequencies that involve important displacements of the generator are located at 15.64Â Hz (horizontal mode) and 21.99Â Hz (vertical mode). For the torsional eigenfrequencies, only the modes at 8.46 and 28.37Â Hz have important displacements at the generator.
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Petit, F., De Bauw, K., Matthys, K., Doucement, S. (2015). Investigating Grid-Induced Turbo-Generator Vibrations: A Multidisciplinary Challenge. In: Pennacchi, P. (eds) Proceedings of the 9th IFToMM International Conference on Rotor Dynamics. Mechanisms and Machine Science, vol 21. Springer, Cham. https://doi.org/10.1007/978-3-319-06590-8_51
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DOI: https://doi.org/10.1007/978-3-319-06590-8_51
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