Resonance and Design Constraints in Nacelle-to-Ground Hydrostatic Transmission Concept for Wind Turbines

Authors

  • Henrique Raduenz Laboratory of Hydraulic and Pneumatic Systems – LASHIP, Department of Mechanical Engineering, Federal University of Santa Catarina – UFSC, Florianópolis, Santa Catarina, Brazil
  • Gabriel Linhares Baldo Laboratory of Hydraulic and Pneumatic Systems – LASHIP, Department of Mechanical Engineering, Federal University of Santa Catarina – UFSC, Florianópolis, Santa Catarina, Brazil
  • Victor Juliano De Negri Laboratory of Hydraulic and Pneumatic Systems – LASHIP, Department of Mechanical Engineering, Federal University of Santa Catarina – UFSC, Florianópolis, Santa Catarina, Brazil

DOI:

https://doi.org/10.13052/ijfp1439-9776.2514

Keywords:

Wind turbine, hydrostatic transmission, resonance frequency

Abstract

This paper presents design principles for the nacelle-to-ground hydrostatic transmission concept for wind turbines including the analysis of resonance originating from the turbine tower. The design has the pump at the top inside the nacelle and the hydraulic motor at ground level driving the generator that is directly connected to the grid. It has no frequency converter. Resonance can originate from the excitation of the natural frequency of the hydrostatic transmission due to the rotor tower shadow effect. The low natural frequency is a consequence of the large rotor mass moment of inertia and high volume of the pressure lines. Through a non-linear model validated by a prototype, it is shown that the nacelle-to-ground hydrostatic transmission concept can supply electricity to the grid with a frequency error that adheres to regulatory limits. Furthermore, using a simplified model, a procedure is proposed to determine the natural frequency and compare with excitation frequencies. It is shown that resonance does not occur in the region of power delivery to the grid for a meaningful range of mid-size wind turbines. In the case of turbines with a capacity of over 600 kW, the resonance may be present during the power delivery to the grid, which might impose a limit maximum power to this concept. However, other design constraints, such as excessive load loss, pressure surges and availability of hydraulic components, can reduce this maximum power limit. A prototype was built with only off-the-shelf components and served, as shown in this paper, as a proof of concept.

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Author Biographies

Henrique Raduenz, Laboratory of Hydraulic and Pneumatic Systems – LASHIP, Department of Mechanical Engineering, Federal University of Santa Catarina – UFSC, Florianópolis, Santa Catarina, Brazil

Henrique Raduenz received his master’s degree in Mechanical Engineering at the Federal University of Santa Catarina (UFSC), Brazil, in 2018. He received his doctor degree in Mechanical Engineering at UFSC and at Linköping University (LiU), Sweden, in 2022. He is currently working as hydraulic systems development engineer at Volvo Construction Equipment, Sweden. His topic of research is fluid power systems for mobile machines.

Gabriel Linhares Baldo, Laboratory of Hydraulic and Pneumatic Systems – LASHIP, Department of Mechanical Engineering, Federal University of Santa Catarina – UFSC, Florianópolis, Santa Catarina, Brazil

Gabriel Linhares Baldo received the Mechanical Eng. degree in 2017, from UNISINOS, Brazil, and master’s degree in Mechanical Engineering at the Federal University of Santa Catarina (UFSC), Brazil, in 2019. Currently works at the company Bosch Rexroth developing hydraulic command blocks applied to agricultural machines and implements in Pomerode, Brazil.

Victor Juliano De Negri, Laboratory of Hydraulic and Pneumatic Systems – LASHIP, Department of Mechanical Engineering, Federal University of Santa Catarina – UFSC, Florianópolis, Santa Catarina, Brazil

Victor Juliano De Negri received the Mechanical Eng. degree in 1983, from UNISINOS, Brazil, M. Eng. degree in 1987 and D. Eng. degree in 1996, both from UFSC, Brazil. He is professor at the Department of Mechanical Engineering at the Federal University of Santa Catarina (UFSC) and the head of the Laboratory of Hydraulic and Pneumatic Systems (LASHIP). He is member of ASME, ABCM, and of the Board of Directors of GFPS and Associate Editor of the International Journal of Fluid Power. His research areas include analysis and design of hydraulic and pneumatic systems and components and design methodologies for mechatronic systems.

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Published

2024-07-04

How to Cite

Raduenz, H. ., Baldo, G. L. ., & Negri, V. J. D. . (2024). Resonance and Design Constraints in Nacelle-to-Ground Hydrostatic Transmission Concept for Wind Turbines. International Journal of Fluid Power, 25(01), 89–126. https://doi.org/10.13052/ijfp1439-9776.2514

Issue

2024: Vol 25 Iss 1

Section

Fluid Power Components & Systems

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