Análise das equações de eficiência de inversores fotovoltaicos através de comparativos teóricos e práticos

Abstract

Photovoltaic Energy is being considerated a fundamental element when it comes to sustainable and clean energy. Developed countries already have solar energy as a considerable part of their energy mix. On the other hand, the actions in Brazil towards this topic are at early stage, but with an outstanding upcoming growth perspective in the next years due to proper solar radiation distribution in the country territory. In this scenario, it is relevant to study implementation conditions and photovoltaic inverter convertion efficiency considering both voltage and solar radiation for brazilian particularities. Considering grid connected photovoltaic systems, this study evaluates three different models for efficiency based on solar radiation with distinct referencials (Europe, Canada and Brazil) and through experimental data, analyses the adherence of commercial photovoltaic inverters to the models described by the above mentioned referencials. In this process, three different inverter models were evaluated under three efficiency equations and it was verified that one of the devices efficiency suffers less from the change in the input voltage in both high and low loads. The results also confirm that inverter efficiency varies in each location (for example, European model is highly influenced by low loads and both Brazilian and American model are more likely to reflect high loads).