I am working on MPPT Charge Controller, but in my MPPT P&O algorithm, with change in the irradiance (also for constant irradiance) the duty ratio is decreasing to minimum value and is becoming constant. Is it right? The same thing is happening with and without battery. Can this happen?
Question is not clear. Which kind of circuit are you using for MPPT interaction?
Some more details are required like converter type, source rating and grid connected or stand-alone mode..
Please refer to these papers:
https://www.researchgate.net/publication/303318836_Shading_Effect_to_Energy_Withdrawn_from_the_Photovoltaic_Panel_and_Implementation_of_DMPPT_Using_C_Language
https://www.researchgate.net/publication/301912126_Proposal_and_implementation_of_a_novel_perturb_and_observe_algorithm_using_embedded_software
Article Shading Effect to Energy Withdrawn from the Photovoltaic Pan...
Conference Paper Proposal and implementation of a novel perturb and observe a...
NO, It is not happening like that...The Purpose of using MPPT is to extract constant power from the source, its always independent to the source nature.. you may check your algorithm and try it...
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