mppt photovoltaic? stateflow chart

Now I have a problem with this one: During my simulation, the curve goes up, finding the maximum mpp... but when the irradiation is low, it starts to go down, which it shouldn't, that is, when it loses power, it doesn't look for the maximum point. I've changed several stateflow commands, some work but when it arrives at mpp it gets lost...

[Varun]

Hey! I tried to run the model that you have attached, and the pointer did stop at the highest point of the third line in the scope plot. Is that not the expected behaviour?

Answer 1

[Sayan]

Hi @Daryane Gaulik,

I understand from this issue that the Perturb and Observe (P&O) algorithm developed by you in the "Stateflow" chart to achieve MPPT in photovoltaic cells is deviating from its MPP at lower irradiance. The most probable reasons for the issue and their possible resolutions are mentioned below.

• The step size of voltage increment/decrement "MPPT_dV" can be reduced for more precise tracking. However, the simulation "Stop Time" needs to be increased as the time of tracking will increase.
• The frequency of the MPPT algorithm "MPPT Freq (Hz)" can be increased for fast tracking which will require less "Stop Time". However, the precision of the tracking will reduce, and there may be oscillations around MPP.

You can refer to the following link to know more about MPPT algorithm

https://www.mathworks.com/solutions/electrification/mppt-algorithm.html

Hope this helps in resolving the issue.