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

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Rahul Dutta ◽  
Feng Wang ◽  
Bradley F. Bohlmann ◽  
Kim A. Stelson
Keyword(s):  
Energy Storage ◽  
Wind Turbine ◽  
Storage System ◽  
Energy Storage System ◽  
Short Term ◽  
Hydrostatic Transmission ◽  
Dynamic Simulation Model ◽  
Term Energy ◽  
Hydraulic Accumulator ◽  
Energy Gains

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.

Short-Term Energy Storage System for Hydraulic Hybrid Wind Turbine Transmission

2020 ◽  
Author(s):  
Eric Mohr ◽  
Biswaranjan Mohanty ◽  
Kim A. Stelson
Keyword(s):  
Energy Storage ◽  
Wind Speed ◽  
Wind Turbine ◽  
Storage System ◽  
Weight Ratio ◽  
Energy Storage System ◽  
Dissipated Energy ◽  
Turbulent Wind ◽  
Hydraulic Hybrid ◽  
Term Energy

Abstract A Hydrostatic Transmission (HST) offers a variable ratio transmission for wind turbines that has a higher power to weight ratio than traditional gearboxes, and requires less maintenance. In a conventional turbine, when the wind speed increases above the rated speed, the blade pitch is controlled to dissipate excess energy and regulate the turbine at rated power. An energy storage system allows the turbine to temporarily operate above rated power, and capture the traditionally dissipated energy in an accumulator. When the wind speed drops below the rated speed, the energy in the accumulator is released, increasing the delivered power This paper presents a high-fidelity mathematical model of the hydraulic hybrid wind turbine transmission. Simulation results for a series of step changes and for turbulent wind speed are investigated for a 60 kW turbine. Using a realistic turbulent wind data sample, energy production increased by 4% with a 52 liter accumulator with significantly smoother output power to the grid.

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