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Methodology for the analytical calculation of shading impact on photovoltaic modules and their production under shading

Lagoudakis Marios

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Summary

In this thesis the effect of shading of the photovoltaic panels and the calculation of their their energy losses under shading is being studied. In the beginning of the thesis, solar maps for the city of Chania are being created. Through this solar map, the percentage of shading for 12 characteristic days of the year is being calculated for three specific types of obstacles. Furthermore, the effect of temperature and radiation on the photovoltaic panel is being studied. For a 54 and 36 cell photovoltaic module P-V and I-V diagrams are being created, for the following cases: 1) no shading on the photovoltaic, 2) on the photovoltaic there is full shading on one cell, 3) on the photovoltaic there is 50% shading on one cell and 4) there is full shading on two cells. The differences of the photovoltaic power decrease are also being observed in the case of one cell shading at 50% and another one with shading at 100% with the use or without of bypass diode. For a specific 36 cell photovoltaic module, the experimental measurements and the theoretical calculations of current and voltage were conducted and the P-V and I-V diagrams that were based on them were exported. The measurements were taken for an unshaded photovoltaic, for shading in the first row of the photovoltaic that is for twelve vertical cells shading, for shading in the upper cell of the photovoltaic and finally for shading in the first four rows of the photovoltaic and the three upper columns of the photovoltaic. Finally, the photovoltaic's annual energy production is being calculated in the cases that the photovoltaic is unshaded and in three other shading cases from another photovoltaic. The first case is about the shading of the photovoltaic along the rows, the second case is about the shading along the columns and the third one is about the shading along the rows of four photovoltaic modules which are the one on top of the other .

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