Dear Ankur,
The variable
md should be
d, and is the number of bypass diodes in the photovoltaic module. SAM assumes that
d = 3, so that each module in the array consists of three submodules connected in series, with each submodule protected by one bypass diode.
I've updated the Errata Sheet for the PV reference manual on the
Performance Documentation Page
to describe this and a couple of other errors in the manual.
Best regards,
Paul.