Abstract

Electrochemical noise (EN) measurements have been provided with PEM fuel cell stack of 600 W nominal power. These measurements demonstrate that EN can be used as a tool for diagnostics of possible faults in long-term running of electrochemical sources of energy. The noise measurements were performed in well controlled operational conditions during 100 h. Robust and stable statistical noise descriptors of the stack have been obtained both in frequency and time domains. The spectral noise signature of the stack based has been obtained in the frequency range 0.1 < f < 10³ Hz and involves two “pink noise” parts with different slopes and a pronounced pick at the characteristic frequency f = 1.6 Hz. The noise signature in time domain is based on calculations of different order moments (intensity, skewness, kurtosis) for original and detrended signals. It was demonstrated the sensibility of the statistical noise descriptors to relaxation phenomena arising in stack after interruption of its running.

中文翻译：

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通过长时间电化学噪声测量生成运行 PEM 燃料电池堆的统计描述符

摘要

电化学噪声 (EN) 测量提供了 600 W 标称功率的 PEM 燃料电池堆。这些测量表明，EN 可用作诊断电化学能源长期运行中可能出现的故障的工具。噪声测量是在 100 小时内在良好控制的操作条件下进行的。已经在频域和时域中获得了堆栈的稳健且稳定的统计噪声描述符。已在 0.1 < f < 10 ³ Hz的频率范围内获得了基于堆栈的频谱噪声特征，并且涉及具有不同斜率的两个“粉红噪声”部分和特征频率f处的明显拾取= 1.6 赫兹。时域中的噪声特征基于对原始信号和去趋势信号的不同阶矩（强度、偏度、峰态）的计算。证明了统计噪声描述符对堆栈运行中断后出现的松弛现象的敏感性。