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.
|Original language||English (US)|
|Title of host publication||BATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020|
|Publisher||American Society of Mechanical Engineers|
|State||Published - 2020|
|Event||BATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020 - Virtual, Online|
Duration: Sep 9 2020 → Sep 11 2020
|Name||BATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020|
|Conference||BATH/ASME 2020 Symposium on Fluid Power and Motion Control, FPMC 2020|
|Period||9/9/20 → 9/11/20|
Bibliographical noteFunding Information:
This project is funded by the National Science Foundation under grant 1634396. We also thanks Scott Lane from Linde hydraulics, for his constructive feedback on secondary pump unit. We are thankful to Michael Gust and Prof. James Van de Ven for the feedback and suggestions.
Copyright © 2020 ASME.