Estimating the efficiency of a PEM electrolyzer fed by a PV plant in NEOM City

Solar Energy Advances Pub Date : 2024-01-01 DOI:10.1016/j.seja.2024.100072

Alberto Boretti

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Abstract

The NEOM City microgrid, designed to be free from fossil fuels generation, is proposed to feature energy supply by wind, solar photovoltaic (PV), concentrated solar power (CSP) with internal thermal energy storage (iTES), and nuclear, plus energy storage by battery (BES), hydrogen (HES) and external thermal energy storage (eTES). The operation of a 100 MW PEM electrolyzer cell (EC) feed with a 100 MW solar PV plant, which is part of the HES, is then analyzed. Based on operational data of old plants, the average annual efficiency of the PEM EC plant is assessed at 0.653, close to the rated power efficiency of 0.676, and higher than the maximum power efficiency of 0.604. Given the continuous improvements in PEM electrolyzers, a novel plant is expected to deliver an efficiency of at least 0.1 more, at a 0.753 annual average. The manuscript also demonstrates the extensive variability of solar energy from daily to annual timescales and its impact on the fluctuating electricity input to electrolyzers, affecting hydrogen production. It emphasizes the importance of choosing suitable electrolyzers and integrating short-term energy storage to stabilize the power supply, and it innovatively examines green hydrogen production variability across multiple time scales.

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估算由 NEOM 市光伏电站供电的 PEM 电解槽的效率

NEOM 城市微电网旨在摆脱化石燃料发电，其能源供应包括风能、太阳能光伏发电（PV）、带内部热能存储（iTES）的聚光太阳能发电（CSP）和核能，以及电池（BES）、氢气（HES）和外部热能存储（eTES）。然后分析了 100 兆瓦 PEM 电解槽（EC）与 100 兆瓦太阳能光伏电站（HES 的一部分）的运行情况。根据旧电站的运行数据，评估得出 PEM 电解槽电站的年平均效率为 0.653，接近 0.676 的额定功率效率，高于 0.604 的最大功率效率。鉴于 PEM 电解槽的不断改进，新型电厂的年平均效率有望至少提高 0.1，达到 0.753。手稿还展示了太阳能从日到年时间尺度上的广泛变化及其对电解槽输入电量波动的影响，从而影响氢气的生产。它强调了选择合适的电解槽和整合短期储能以稳定电力供应的重要性，并创新性地研究了多个时间尺度上的绿色制氢变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solar Energy Advances

CiteScore

4.00

自引率

0.00%

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