VMD Based Fault Diagnosis Method for SOFC Stack Seal Failure and Leakage

doi:10.11930/j.issn.1004-9649.202307033

Abstract

Abstract:

When the solid oxide fuel cell (SOFC) operates for a long time at high temperature, due to the repeated start-stop cycle and long-term operation, the reactor is prone to seal failure, which will lead to leakage failure, and then lead to thermal runaway and damage of the reactor, which seriously affects the stability of the system operation. The change of parameters may lead to the occurrence of leakage faults and consequently thermal runaway of the stack or even abnormal system shutdown. Aiming at this fault, a diagnostic method based on the variational mode decomposition (VMD) and Hilbert transform (HT) is proposed through the experiment temperature and voltage signals. This method was applied to experimentally investigate the sealing failure leakage fault in SOFC stacks. The research results demonstrate that utilizing the fault diagnosis method based on VMD and HT can determine the presence of leakage in the stack under open-circuit conditions. By collecting the temperature and voltage signals of the stack and applying this fault diagnosis method, the temperature signal can more rapidly indicate the presence of a leakage fault in the stack. When comparing the diagnosis methods based on Ensemble Empirical Mode Decomposition and VMD, it was found that the latter can detect the leakage fault in the stack 100 seconds faster.

Key words: SOFC, stack leakage fault, temperature signal, voltage signal, VMD method

Xin WU, Chao HU, Qi WANG, Xingyu XIONG, Liang HU, Xiangchen QIAN. VMD Based Fault Diagnosis Method for SOFC Stack Seal Failure and Leakage[J]. Electric Power, 2024, 57(12): 139-147.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202307033

https://www.electricpower.com.cn/EN/Y2024/V57/I12/139

Figures/Tables 14

Fig.1 Flow chart of stack leakage fault diagnosis method

Fig.2 Kilowatt scale SOFC stack

Fig.3 Structure of experimental platform

Fig.4 Thermocouple array placement diagram

Fig.5 Temperature data for each thermocouple at the air outlet

Fig.6 The IMF component of the temperature signal

Fig.7 Instantaneous amplitude of IMF1 component of temperature signal

Fig.8 Comparison of time domain kurtosis IMF1 instantaneous amplitudes

Fig.9 Temperature and voltage signal of the same period

Fig.10 Time domain characteristic kurtosis of temperature versus voltage based on EEMD method

Fig.11 The IMF component of the temperature signal

Fig.12 Instantaneous amplitude of IMF5 component of temperature signal

Fig.13 Comparison of time domain kurtosis of IMF5 instantaneous amplitudes

Fig.14 Time domain characteristic kurtosis of temperature versus voltage based on VMD method

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