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International Journal of Rotating Machinery
Volume 2017, Article ID 5651736, 9 pages
Research Article

Variable Ratio Hydrostatic Transmission Simulator for Optimal Wind Power Drivetrains

1Purdue University, West Lafayette, IN, USA
2Universidad Tecnológica de Querétaro, Santiago de Querétaro, QRO, Mexico
3Universidad de los Andes, Bogotá, Colombia

Correspondence should be addressed to Jose M. Garcia-Bravo; ude.eudrup@aicragmj

Received 20 May 2017; Accepted 20 July 2017; Published 28 August 2017

Academic Editor: Lei Chen

Copyright © 2017 Jose M. Garcia-Bravo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This work presents a hydromechanical transmission coupled to an electric AC motor and DC generator to simulate a wind power turbine drive train. The goal of this project was to demonstrate and simulate the ability of a hydrostatic variable ratio system to produce constant electric power at varying wind speeds. The experimental results show that the system can maintain a constant voltage when a 40% variation in input speed is produced. An accompanying computer simulation of the system was built and experimentally validated showing a discrete error no larger than 12%. Both the simulation and the experimental results show that the electrical power output can be regulated further if an energy storage device is used to absorb voltage spikes produced by abrupt changes in wind speed or wind direction.