Analysis of dynamics of fluid power drive-trains for variable speed wind turbines: parameter study

Antonio Jarquin Laguna; Niels F.B. Diepeveen; Jan Willem van Wingerden

Analysis of dynamics of fluid power drive-trains for variable speed wind turbines: parameter study

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Author(s): Antonio Jarquin Laguna ¹ ; Niels F.B. Diepeveen ¹ ; Jan Willem van Wingerden ²
- Affiliations: 1: Offshore wind, TU Delft, Delft, The Netherlands;
  2: Delft Center for Systems and Control, TU Delft, Delft, The Netherlands
Source: Volume 8, Issue 4, May 2014, p. 398 – 410
DOI: 10.1049/iet-rpg.2013.0134 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 22/05/2013, Accepted 01/10/2013, Revised 19/08/2013, Published 04/04/2014

In the pursuit of making wind energy technology more economically attractive, fluid power technology for the transmission of wind energy is being developed by several parties all over the world. This study presents a dynamic model of a fluid power transmission for the variable speed wind turbines and shows a parametric study on the dynamic behaviour below the rated wind speed. A pressure control strategy is proposed to achieve a variable speed operation of the rotor while using a fixed speed generator. The rotor of a five megawatt reference turbine is used to perform the time domain simulations. Different values of the hydraulic line length and transmission efficiency are considered for the same wind conditions and the results are compared with the response of the reference gearbox drive train. The results show that the amount of oil in the hydraulic drivetrain has an important influence on the first natural frequency of the transmission and the pipeline dynamics become more relevant for the longer transmission lines. Lowering the volumetric efficiency of the hydraulic motor leads to an additional damping of the pressure fluctuation, however, its influence is minor and unlikely to be advantageous when compared with the power loss.

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Analysis of dynamics of fluid power drive-trains for variable speed wind turbines: parameter study

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