IV. CONCLUSION
Considering the tracking efficiency to be the deciding
parameter, we may conclude that a buck converter when
interfaced in linking the PV panel and the load, the scheme is
operates near the MPP for lower irradiance and temperature
values (for higher MPP impedance). For highest values of
solar irradiation the Rmpp takes the minimum value and
consequently the buck converter fails to track MPP. Thus the
buck converter has the limitation to track the MPP at some
condition or the other. However with the buck-boost converter
these inabilities could be overcome. The buck-boost converter
can track the MPP with a reasonably higher efficiency in all
the subjected atmospheric conditions of insolation and
temperature. The reason behind this ability is that, during
lower insolation and temperature that reflects greater
impedance, the converter can act in buck mode and during
higher insolation and temperature, the converter transforms to
boost mode leading to the reduction in the input impedance as
reflected on the converter and thus there is an improvement in
the ability to meet the converters MPP