光伏电解水制氢典型工况及质子交换膜电解堆性能衰减研究

doi:10.19595/j.cnki.1000-6753.tces.231400

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Abstract The photovoltaic (PV) power generation is greatly influenced by weather factors and has great fluctuation. Hydrogen production equipment by electrolysis of water, especially proton exchange membrane (PEM) electrolytic stacks, has the characteristics of fast power response and wide power range, and is very suitable for absorbing PV output with strong fluctuation and preparing green hydrogen. However, at present, there is little research on the performance change of electrolytic stacks under fluctuation power input, and there is a lack of working modes to simulate and test the typical application scenario of electrolytic stacks, which can not provide typical input conditions for the performance attenuation test of electrolytic stacks. Therefore, an extraction method of typical working conditions of PV electrolytic water hydrogen production was put forward in this paper, which can obtain the typical working conditions curve reflecting the performance attenuation characteristics of electrolytic stacks under PV fluctuation input.
Firstly, empirical wavelet transform (EWT) was used to analyze the initial PV output curves in time and frequency domain, and PV output components with different fluctuation frequencies were separated. Secondly, the fluctuation characteristics of different time periods weredefined and extracted to reduce the dimension of the output curves. Thirdly, the weighted fuzzy clustering method was used to reduce the scenes of many fluctuation feature sequences, and typical PV output scenes were obtained. Finally, according to the characteristic sequence, the working condition indexes are set and the simplified working condition curves are reconstructed, and the cycle working condition spectrum of the electrolytic stacks was obtained.
A PV water electrolysis hydrogen production system in the "Three North" area of China was selected as an example, and the PV output data with 1 minute resolution in three years were analyzed. The frequency band number N of EWT was selected as 5, and the initial data curves were decomposed into five components. According to the characteristics of feature sequence data, the optimal clustering number was 4 for scene reduction. In order to compare the advantages of clustering results, the attenuation model of electrolytic stack was introduced to calculate the change values of membrane thickness and catalyst activity of electrolytic stack under different PV input scenarios. The results show that compared with the typical working conditions obtained by other clustering methods, this method has taken into account the degradation of electrolytic stacks, and the separation (SP) index values, containing thickness of PEM and normalized electrochemical active surface area of catalyst, are 0.066 7 and 0.244 3 respectively, which are better than the other three methods. Compared with four kinds of typical original curves, the typical operating curve obtained by the simplification method in this paper has a difference of 4.055 4%, 6.454 6%, 3.616 8% and 2.163 3% respectively in voltage degradation rate, which proves the feasibility of the simplification method.
Through simulation analysis, the conclusions are following: (1) the typical working conditions have a good role in describing the performance attenuation of electrolytic stacks. (2) Compared with other methods, the typical working condition curves of PV electrolytic hydrogen production generated by this method can distinguish the performance attenuation of electrolytic stacks, which is more effective in the performance test experiment of electrolytic stacks. (3) For voltage degradation of electrolytic stacks, the difference between the typical working conditions and the actual curves is less than 10%, which is of testing significance.

Key words： Hydrogen production by electrolysis of water empirical wavelet transforms fuzzy clustering typical working condition

Received: 28 August 2023

PACS:	TM615
	TK91

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	Xu Yanhui
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	Hu Junjie

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Xu Yanhui,Chen Haowei,Hu Junjie. Study on Typical Working Conditions of Hydrogen Production by Photovoltaic Electrolysis of Water and Performance Degradation of Proton Exchange Membrane Electrolytic Stacks[J]. Transactions of China Electrotechnical Society, 2024, 39(19): 6228-6243.

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