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Reliability evaluation of two-stage interleaved boost converter interfacing PV panels based on mode of use

By rapid penetration of renewable energy sources, such as photovoltaic (PV) and wind generation systems, many issues about utilization of these units have emerged. To achieve a sustainable source of electrical energy, a reliable generation unit is required. In PV systems, the DC-DC boost converters are responsible for maximum power point tracking (MPPT). Consequently reliability of these converters should be increased to have a reliable source of electrical energy. The aim of this paper is to evaluate reliability of interleaved boost converters interfacing a PV panel based on mode of use. A comparative study on reliability of a two-stage interleaved boost converter has been done based on different operation modes; redundant operation or parallel operation. For parallel mode of use, two scenarios are considered. In low power generation of PV panels, one healthy stage would be adequate to process the power, however in nominal power generation, operation of both stages would be obligatory. Effects of converter components residential and switching power losses, are contemplated in reliability calculations. Without considering off time of PV panels during night hours, previous studies performed on reliabilities of PV panels power electronic interfaces are pessimistic. Due to this fact, actual time of operation in PV panels, are considered in reliability calculation of the converter, by a clustering method. Finally output data of a PV panel installed in the campus is used to get the actual reliability relations.