可再生能源供电的碱性水电解（AWE）系统中,针对功率波动导致的氧中氢（HTO）浓度升高威胁安全运行及操作参数不合理导致系统效率降低的问题,提出一种基于操作参数可行域的协调控制方法。首先,分析波动工况下温度变化和旁路电流对AWE系统的影响,建立HTO浓度和系统效率模型,并进行参数敏感性分析。其次,根据电流密度、压力、电解液循环流量三者的安全运行边界,给出AWE系统操作参数的可行域。最后,提出一种基于可行域的波动工况下AWE系统操作参数多目标优化控制方法,并在光伏与风电制氢场景中进行验证。结果表明,该方法可有效延长系统的运行时长,提高氢气产量,改善了AWE系统对可再生能源的适应性,实现安全、高效制氢。
Abstract
In alkaline water electrolysis （AWE） systems powered by renewable energy, elevated hydrogen to oxygen （HTO） concentration caused by power fluctuations poses safety risks, and improper operating parameters lead to reduced system efficiency. To address these issues, this study proposes a coordinated control method based on the feasible domain of operating parameters. First, the influence of temperature variations and shunt currents on the AWE system under fluctuating operating conditions is analyzed, and models for HTO concentration and system efficiency are established, followed by a parameter sensitivity analysis. Then, the feasible domain of AWE operating parameters is determined based on the safety boundaries of current density, pressure, and electrolyte circulation flow rate. Finally, a feasible-domain-based multi-objective optimization control method is proposed for AWE operation under fluctuating conditions, and its effectiveness is verified in photovoltaic and wind power hydrogen production scenarios. The results demonstrate that the proposed method effectively extends the system’s operating hours, increases hydrogen production, enhances the adaptability of the AWE system to renewable energy, and achieves safe and efficient hydrogen production.
关键词
电解槽 /
氢气生产 /
电流分布 /
碱性水电解 /
多目标优化 /
可行域 /
能量转换效率
Key words
electrolyzer /
hydrogen production /
current distribution /
alkaline water electrolysis /
multi-objective optimization /
feasible domain /
energy conversion efficiency
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基金
河北省重点研发计划（21314303D）; 河北省科技重大专项（23284502Z）
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