Research Papers

Analysis of Short-Term Energy Storage for Midsize Hydrostatic Wind Turbine1

[+] Author and Article Information
Kim A. Stelson

Center for Compact and Efficient Fluid Power,
Department of Mechanical Engineering,
University of Minnesota,
Minneapolis, MN 55414

1This paper was submitted to 2012 ASME Dynamic Systems and Control Conference (DSCC'12) and has been selected as the top 20 outstanding finalist paper.

2Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received September 21, 2012; final manuscript received August 8, 2013; published online September 23, 2013. Assoc. Editor: Luis Alvarez.

J. Dyn. Sys., Meas., Control 136(1), 011007 (Sep 23, 2013) (9 pages) Paper No: DS-12-1310; doi: 10.1115/1.4025249 History: Received September 21, 2012; Revised August 08, 2013

This paper presents a novel method of capturing more energy from the wind using short-term energy storage in a hydrostatic wind turbine. A hydrostatic transmission (HST) not only provides reliable operation but also enables energy management features like energy regeneration using hydraulic accumulators. In this study, turbulence-induced wind transients occurring near the rated power are exploited to extract more energy from the wind. Wind characteristics are analyzed to develop models to quantify the energy losses due to the wind turbulence and the potential energy gains from the short-term energy storage. A dynamic simulation model of the hydrostatic wind turbine and the proposed energy storage system is developed. A rule-based control strategy for the energy storage is proposed. Results show that in a 50 kW hydrostatic wind turbine, the annual energy production (AEP) can be increased by 4.1% with a 60 liter hydraulic accumulator.

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Fig. 1

Power curve of a typical wind turbine

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Fig. 2

Illustrative wind speed spectrum (after van der hoven [10])

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Fig. 3

Loss in average rotor power due to wind turbulence in AOC 15/50

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Fig. 4

Short-term wind energy storage and reuse

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Fig. 5

Schematic of short-term energy storage for a hydrostatic wind turbine

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Fig. 6

Wind torque as a function of wind speed at the rated rotor speed

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Fig. 7

10-min turbulent wind profile

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Fig. 8

Generator output powers with and without storage

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Fig. 10

Turbine output power curves with and without energy storage

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Fig. 11

Sensitivity study of accumulator size on AEP




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