Hi All, Currently, I'm doing a research on three phase pv grid-tied. For further understanding, I try to find a model to analyze the data and results. I've found a model which is in Matlab/Simulink. However, I'm having difficulties in understanding how the MPPT and subsytem work. Could anyone please explain to me. There's an attachment which is the Grid-Tied Connected System in Simulink. My questions are: In MPPT block, i) Is Pn-Pb equivalent to P(n)-P(n-1) ? ii) Instead of delta P/delta V why is that delta P * delta V ? iii)The 0.001(Delta D) is that the duty ratio? In Subsystem block, i)I try to model out the equation. But I couldn't really figure it out which equation he used.Can anyone please guide me on this? Sincerely hope someone could guide me on this. Sorry for any inconveniences caused. Many thanks.