How to integrate PEM electrolysis system and PEM fuel cell system to form ‌the DC Electrical Power System?

Fig. 1 shows the PEM (Polymer Electrolyte Membrane) Electrolysis System.

Fig.1 PEM Electrolysis System

Fig. 2 shows the PEM (Polymer Electrolyte Membrane) Fuel Cell System.

Fig.2 PEM Fuel Cell System

Fig. 3 shows the Solid-Oxide Fuel Cell Connected to Three-Phase Electrical Power System.

Fig.3 Solid-Oxide Fuel Cell Connected to Three-Phase Electrical Power System

My question is how to complete the following tasks:

(1) Integrate Fig. 1 and Fig. 2 to form ‌the DC Electrical Power System—the PEM Electrolysis—Fuel Cell‌.

(2) Integrate Fig. 1, Fig. 2, and Fig. 3 to form ‌the DC Electrical Power System—PEM Electrolysis—Fuel Cell—Electrical Power System‌.

Reference：

• Hydrogen Electrolyzer: https://ww2.mathworks.cn/discovery/hydrogen-electrolyzer.html
• PEM Fuel Cell System：https://ww2.mathworks.cn/help/simscape/ug/pem-fuel-cell-system.html
• Fuel Cell Model：https://ww2.mathworks.cn/discovery/fuel-cell-model.html
• Solid-Oxide Fuel Cell Connected to Three-Phase Electrical Power System：

https://ww2.mathworks.cn/help/sps/ug/solid-oxide-fuel-cell-connected-to-three-phase-electrical-power-system.html

• Hydrogen Electrolyzer: https://ww2.mathworks.cn/discovery/hydrogen-electrolyzer.html

https://ww2.mathworks.cn/help/simscape/ug/pem-electrolysis-system.html

Integrating the PEM electrolysis system and the PEM fuel cell system—does this mean replacing the Hydrogen Source in the PEM fuel cell system with the PEM Electrolysis System? Could the experts provide specific guidance on this? Thanks in advance.

Answer 1

[Zhu]

Attachment is my model for integrating the PEM electrolysis system and the PEM fuel cell system. But I'm not sure if this is the right way to do it.

Answer 2

[Yifeng Tang]

Check out this examples: Green Hydrogen Microgrid https://www.mathworks.com/help/sps/ug/green-hydrogen-microgrid.html. See how electrical power generated by Solar array is stored in battery and used for electrolysis. DC-DC converters are needed to couple these components. The electrolysis block is a simplified one from the Simscape Electrical library and you may replace it with a similarly sized, more-detailed, electrolyzer model.

You may then replace the solor array power source with a fuel cell.

I think it'll be critical that the system stitched together are properly sized, meaning the fuel cell produces electrical power that is reasonable for the electrolzer to consume and reasonable for the size of the DC-DC. I would suggest you test each subystem using ideal voltage or current sources first, understand the power, up or down size if needed, and proceed.

Hope this helps.