目前电化学阻抗谱广泛应用于燃料电池故障诊断。针对诊断设备成本高昂的问题,提出集成在燃料电池系统DC/DC变换器的EIS测试方法,将激励信号在变换器双闭环控制的参考信号上分别施加干扰,实现了燃料电池电流和电压宽频带的在线扰动。为实现快速测试,采用一种伪随机二进制序列作为激励信号,可同时满足频率宽度和功率强度需求。实验采用Matlab/Simulink建模仿真,通过硬件在环实验验证,测试方法满足时间和精度要求,可通过嵌入式系统实现在线测试。
Abstract
Currently, electrochemical impedance spectroscopy is widely used for fault diagnosis of fuel cells. In view of the high cost of diagnostic equipment, an EIS test method integrated in the DC/DC converter of the fuel cells system is proposed. An excitation signal is applied to the reference signals for dual-loop control of the converter separately. It causes broadband online disturbances of fuel cells’ current and voltage. For faster testing, a kind of pseudo-random binary sequence is designed as the excitation signal to meet the needs of bandwidth and power intensity. The experiment uses MATLAB/Simulink for modeling and simulation, and is verified by hardware-in-the-loop experiments. This method meets the requirements of time consumption and high accuracy, and online testing can be realized through embedded systems.
关键词
燃料电池 /
故障诊断 /
电化学阻抗谱 /
二进制序列
Key words
fuel cells /
fault diagnosis /
electrochemical impedance spectroscopy /
binary sequences
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基金
中央科研基本业务费（PA2018GDQT0021）
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