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Due to gradual depletion of fossil fuels resources and emission of harmful chemicals
accompanying the combustion process, the interest in alternative energy sources still
increases. Among many kinds of alternative sources, solar radiation is very special
because of its wide availability and large technical potential. Photovoltaic systems
providing the electric energy are used in many countries. The most important part of
photovoltaic system is a module, which parameters (e.g. efficiency, rated power,
temperature coefficients of power and efficiency, short circuit current, open circuit
voltage) are determined in laboratory tests under Standard Test Conditions (STC:
25oC, 1,000 W/m2, air mass 1.5). However, in real outdoor conditions the modules
exhibit lower efficiency since local climate influences their performance and
different external factors generate energy losses in the whole system. The aim of this
work is the performance analysis of a solar power plant connected to the grid, which
total rated power is 2.985 MW and it works in temperate climate in eastern Poland.
Insolation in the location was estimated according to Solargis data and the role of the
modules tilt angle, of which the value is non-typical for the considered location was
studied. The tilt angle smaller than optimal angle allows increasing the amount of the
solar radiation collected in the summer period. The electric energy production based
on the inverters data in 2016 and 2017 as well as yearly yield are presented.
The results are compared to data coming from other solar power plants, also located
at high latitude.