Modeling and Analysis of short term energy storage for mid-size hydrostatic wind turbine

Thumbnail Image

Persistent link to this item

View Statistics

Journal Title

Journal ISSN

Volume Title


Modeling and Analysis of short term energy storage for mid-size hydrostatic wind turbine

Published Date




Thesis or Dissertation


The rise in fuel costs and the impact of global warming due to increase in carbon dioxide emissions have led to renewed interest in renewable energy, primarily wind and solar. Although wind energy technology has developed considerably, it still faces major challenges that prevent it from competing with fossil fuels. One of the problems facing the wind turbine industry is the reliability of wind turbine drivetrains. Research conducted at University of Minnesota aims to improve the reliability of wind turbine drivetrain by replacing the conventional drivetrain with a Hydrostatic Transmission (HST). HST is a reliable, robust and a mature technology that has been used in demanding application since more than half a century. An HST system also enables robust energy management features like energy regeneration using hydraulic accumulators. The goal of this thesis is to explore short term wind energy storage to improve the energy captured by a wind turbine by using an HST coupled to a hydraulic accumulator. Mathematical models of the wind turbine and the HST system is developed to understand its dynamics and to validate the energy storage ideas via simulations. The characteristics of wind are investigated to understand the nature of wind and explore opportunities for energy storage. A novel method for capturing more energy from the wind is proposed. Control strategies are developed and accumulator storage system configurations are proposed to achieve the storage objectives. The performance of the control strategies and accumulator storage configurations are simulated in MATLAB/Simulink environment. Results show that a 50 kW turbine using an energy storage system and located at a high turbulence site can increase the Annual Energy Production (AEP) by more than 4% using a 60 liter hydraulic accumulator.


University of Minnesota M.S. thesis. August 2012. Major:Mechanical Engineering. Advisor:Prof. Kim A. Stelson. 1 computer file (PDF); vii, 141 pages, appendices A-C.

Related to



Series/Report Number

Funding information

Isbn identifier

Doi identifier

Previously Published Citation

Suggested citation

Dutta, Rahul. (2012). Modeling and Analysis of short term energy storage for mid-size hydrostatic wind turbine. Retrieved from the University Digital Conservancy,

Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.