A grid-connected photovoltaic(PV) power plant is mainly based on power electronics equipments which are considered as the most vulnerable parts in a PV system. In order to increase the reliability of modular grid-connected PV panel, a solution by using a Scott transformer is presented to reduce the number of switches and to continuously operate the PV system in case of switch-failures of the power converter. The three-phase type PV inverter is analyzed in the normal and fault-operation. The simulation has shown that fault tolerance can be achieved with the proposed system configuration to give a redundancy of power switches in an Integrated power electronic module.
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Dat et al. (2012) studied this question.