| Abstract |
Integration of power due to distributed renewable energy resources (DRERs) with the existing gridto supply electricity to both industrial and residential users is expected to have a significant impact onthe future power system. Power electronic transformer (PET) has emerged as one amongst the promisingtechnologies to achieve such requirement. In this paper, a multi-source fed power electronic transformer(MSF-PET) is proposed to integrate both ac and dc sources to supply the load power. The MSF-PETconsists of three stages: input, isolation, and output. The input stage consists of two power electronicconverters, viz. ac-dc and dc-dc converters, to integrate ac and dc sources, respectively. The outputs ofthese converters are connected to the inputs of two dual active bridge converters (DABs) of the isolationstage. The outputs of DABs are connected in parallel across the dc-link of the output stage inverter. Inthe proposed PET, the input and output ports are isolated from each other and interlinked by usingdifferent power electronic converters. Therefore, each port can be easily isolated by applying theappropriate gate signals to the associated converters. Further, the power can be supplied to the load fromboth sources simultaneously or independently. A detailed description of MSF-PET and its control arepresented. The theoretical analysis of MSF-PET is verified using PSCAD/EMTDC simulations. Thestudy results show that MSF-PET can be a promising topology for the modern distribution system tointegrate both the conventional ac grid and DRERs generating dc power. |
