Boost converter (or any dc-dc converter) connects PV array with load. MPPT algorithm modifies the duty ratio (of this converter) such that PV array is operated at voltage (or current) corresponding to maximum power point.
Normally, in applications other than Solar PV, input to boost converter is a constant dc voltage source. In such circuits duty ratio is calculated based on the amplification required and circuit parameters (R,L) are found based on allowable ripple. However in the case of photovoltaic applications the input is a PV array which is a non linear dependent current source.
This problem has been discussed in chapters 7 & 8 of the book "Photovoltaic Systems - Analysis and Design" by A. K. Mukerjee and Nivedita Thakur, PHI publication 2011.
What you need to do is connect a constant voltage source (such as battery) to the output of converter. By doing so, the duty cycle of converter can be determined base on the required solar array voltage (peak power point)
You can have a look at these simulations:
https://uk.mathworks.com/matlabcentral/answers/183689-how-does-mppt-maximum-power-point-tracking-simulink-model-work
Regards
I advise you to see the following chapters:
- Mohan, Undeland and Robbins, Power Electronics: converters, applications and design, 3rd ed. John Wiley & Sons, 2003. (Chapter 7)
- Muhammad H. Rashid, Power Electronics: Circuits, Devices, and Applications, 3rd . Prentice Hall, 2004. (Chapter 13)
- Ewald F. Fuchs l Mohammad A.S. Masoum, Power Conversion of Renewable Energy Systems, ISBN 978-1-4419-7978-0, Springer, 2011. (Chapter 5)
Here is the calculator to design MPPT boost converter: https://www.mathworks.com/matlabcentral/fileexchange/68276-boost-converter-design-for-mppt-application
I just completed my research on this on Jan 2018.
You cannot use the conventional calculation since it is based on constant voltage source.
While PV module is not constant voltage source, it is a nonlinear source.
Therefore, the calculation is different.
You can see my derivation and calculation procedure in this research paper:
Design of boost converter based on maximum power point resistance for photovoltaic applications
On a practical level, I wonder if you are experienced in designing fault finding and testing high power circuits? If so then proceed in accordance with the recommendations given earlier and be assured of good results. If you have NOT done work like this before be EXTREMELY cautions because you are dealing with potentially lethal voltages and power levels; Build small units then work up!
Maake sure all your components are operating well within their specifications, keep ALL high frequency wiring short and direct and ensure you have appropriate test equipment - at least one current probe is esential.
Best wishes with your work!
please go through the attached books it helpful for desgin boost converter parameters