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made possible through a Hydrogenics-provided gas control panel and dispenser, able to fuel vehicles to 5,000 psi. A key component of this project was the development of a dynamic scheduling system to control the wind energy’s variable output to the electrolyzer cell stacks. The dynamic scheduling system received an output signal from the wind farm, processed this signal based on the operational mode, and dispatched the appropriate signal to the electrolyzer cell stacks. Unfortunately, chronic shutdown issues prevented consistent operation, and therefore did not allow accurate economic analysis as originally intended. Much valuable experience was gained in the form of “lessons learned,” however, and the project served as an extremely valuable platform for educating the public. National Renewable Energy Laboratory and Xcel Energy, Wind-to-Hydrogen Project Xcel Energy and the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) have collaborated to design, install, and operate the Wind-to-Hydrogen (Wind2H2) project. As the largest provider of wind-generated electricity in the United States, Xcel Energy is working with NREL to establish and understand state-of-the-art renewable electrolysis equip- ment and the operation of a renewable hydrogen production facility. Hosted at NREL’s National Wind Technology Center (NWTC), the Wind2H2 system was approved for initial operation in March 2007 and is enjoying success as a demonstration project, producing hydrogen directly from renewable energy sources. This unique research-oriented project uses solar and wind energy to produce and store hydrogen. The stored hydrogen can be used both as a transportation fuel and as an energy-storage medium, effectively allowing renewable energy to be stored and then converted back to electricity at a later time. The Wind2H2 project is helping researchers understand the hurdles and potential areas for improvement in emerging renewable electrolysis technologies. By allowing engineers to operate and configure an integrated electrolysis facility, this project has enabled the investigation and analysis of hydrogen production, compression, storage, and electricity generation. This project is generating valuable data that are being used to improve the designs of future renewable electrolysis systems. The Wind2H2 project provides important guidance to industry and key stakeholders for development of future renewable electrolysis systems. The Wind2H2 project is the only renewable hydrogen production facility in the world that can operate multiple electrolyzers in any of the following configurations: • Grid connected • Directly connected from the output of a photovoltaic array to the electrolyzer stack • Real-time electrolyzer stack current control based on a power signal from a wind turbine • Closely coupled photovoltaic (PV) and wind energy sources to the electrolyzer stack with custom designed and built power electronics. NREL and Xcel Energy have undertaken the Wind2H2 project with several key objectives in mind. First and foremost the Wind2H2 project is being used to demonstrate the operation of a renewable electrolysis system, allowing researchers to evaluate actual system performance and costs and to identify areas for cost and efficiency improvements. Additionally, the project 13PDF Image | Hydrogen Production: Fundamentals
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