Dear researchers, my question is about the control of isolated DC-Microgrid systems adopting PV-HESS resources. So far, i target to use frequency decoupling control strategy to allow the battery to deal only with the low-frequency current, while the supercapacitor intervenes during transient regimes to provide or absorb the high-frequency currents.
Now, I am asking if we can adopt such control strategy having a PV-Wind-FC system supported by a single battery technology (Lead-acid or lithium-ion)?
If yes, which source can replace the supercapacitor and thereby deal with the high-frequency current?
Hafsi Oussama Mohammed Amine Soumeur Rebhi Mhamed Chakar Abdeselem Abdallah Ben Abdelkader Gasbaoui Brahim
Good question by Mr Mohamed Amine , according to study of comparison between Lead-acid or lithium-ion batteries published by Michael Moobs in sustainable projects , the lithium-ion battery is very important at cycle life and high frequency , you can see this study in this pdf file below :
Rebhi Mhamed, glad to hear your response and i have already reviewed this comparison between Lead-acid and Lithium-ion BESS's, but the question to answer now is: can we adopt a hybridization between Lead-acid and Lithium and hereby consider that Lithium copes with the high-frequency components while Lead-acid supply only permanent currents (low-frequency components)?
If yes, how to preserve the life cycle of lithium-ion battery when sharing high dynamic currents and spikes?
So glad to hear from you again doctor.
Fine, in this case you should implement an intelligent algorithm such as fuzzy logic or neural network under specific controller as a help technique to monitoring only these batteries if it is possible or you can program it in system supervisor , where its input parameters are the frequency , the state of charge and the load profile in order to make a decision at the right commutation . good luck our friend.
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