Dear Ikram,

You may follow the attached link, which already discussing similar issue...https://www.researchgate.net/post/How_to_write_algorithm_for_P_and_O_type_MPPT_for_Solar_PV

See also https://www.mathworks.com/matlabcentral/fileexchange/67141-perturb-and-observe-mppt

Dear Muhammad Talha Ikram,

In order to simulate one of the MPPT techniques, you need to decide which method of modeling you want to use: per block or with script.

Per block: you can easily insert you step size into a constant block tied to a switch block..to see more:

https://www.mathworks.com/matlabcentral/fileexchange/39641-perturb-and-observe-p-o-algorithm-for-pv-mppt

With script: it's a program that generates the duty cycle according to the changes in PV voltage and current....here, the step size is a code variable.

Dear @Abdelilah Hassoune ,

I am working on improved form of P&O MPPT algorithm. And originally I am facing issue converting classical P&O MPPT Simulink model to DP P&O MPPT Simulink model. Can you kindly provide me with any model specifically for DP P&O MPPT as a reference.

Best regards..