INVESTIGATION OF THE LOSSES OF PHOTOVOLTAIC SOLAR SYSTEMS DURing OPERATION UNDER PARTIAL SHADing
The article deals with research in solar power plants and Renewable Energy Laboratory. The purpose of research
was to study the infl uencing of partial shading on the energy effi ciency of photovoltaic installations in various connection
options. As the title implies the article describes a study of the possibilities of increasing their energy effi ciency
when operating under different conditions. It is spoken in detail about replacement of "block connection" panels to
the "in-line connection", in case of partial shading by the previous string. It is shown that substitution allows to obtain
a signifi cantly higher power - up to 8 times. It is examined that the horizontal arrangement of the panels instead of
the vertical, under the same conditions, also allows up to 5 times the power of the partially shaded array in the case
"in-line connection" and by 34% in the case of a "block connection". It is analyzed that parallel connection of partially
shaded photovoltaic array with normally illuminated, requires voltage matching, for the selection of electrical energy
at the point of maximum power, which makes it possible to obtain much more energy from the shaded array. It is
experimentally shown that when using the "Intelligent maximum power selection device" that implements the voltage
matching, it is possible to increase the array power up to 4 times with partial shading of 3 panels of 18. It should be
noted that the choice of methods that allow receiving energy from shaded panels through individual matching converters
does not permit signifi cantly increasing the energy production of partially shaded array. It is experimentally
shown that as a result of their use the array power does not increase by more than 2.5%. The results of research can
be used in the design of new installations based on photovoltaic cells and the modernization of existing ones.
The authors would like to thank the Institute of Nuclear
Energy and Industry in Sevastopol State University and
the University of Kufa for their continuous fifi nancial and
moral support. The research was carried out at the expense
of the grant of Federal State Autonomous Educational
Institution of Higher Education "Sevastopol State
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