Efeitos da posição e nível de sombreamento na potência de saída da matriz fotovoltaica
Keywords: Photovoltaic arrays, Partial shading, Critical point, Maximum power
AbstractThe power loss in a photovoltaic array under identical partial shading pattern is proportional to the percentage of shading. This makes sense, as the photovoltaic array depends on solar irradiance to generate electrical energy. However, it is tacitly assumed that the maximum power of a partially shaded PV array always decreases as the shading intensity increases. However, although poorly documented, it appears in the literature that this may not be the case. The investigation of the PV characteristic curve under different numbers of shaded modules and percentage of shading suggests that the photovoltaic array becomes insensitive to the percentage of shading when the irradiance of the shaded modules reaches a certain critical point. A series- connected and series-parallel photovoltaic array is used in this article. The critical point can vary based on the number of shaded modules, size and configuration of the PV array.