Integrated Power Converter for DistributedGeneration

Distributed generation systems with the using of the renewable sources increasingly, application of the distributed generation (DG) in the distribution system acquired more attention. After the power system faults, distribution system which contains many DGs would usually cut off the DGs from the distribution system at the joint where the DGs connected into the system term less. However, considering the enlarge scale and the capability of the DGs, also with the improving ratio of the DG to all generator, cut off the DGs from the distribution system directly without analysis of the splitting point detailed after the faults occurs in the power system, which cannot improve the reliability of the distribution system and made the effect of the DG at a discount. Distributed generation systems also include local energy sources, storages, and loads. Almost always, these entities have their own power converters for grid interfacing and energy processing. Having individual converters has advantages like more flexible individual control and simpler design but does not encourage functionality merging. Reduction of semiconductors to arrive at a more compact integrated design is thus not possible. Addressing this concern, a number of integrated energy generation systems that use 25% lesser semiconductors are proposed. The systems can be single or three phase depending on the types of sources, storages, and loads assembled. They can operate in the grid-tied or stand-alone mode with no compromise in performances expected, when compared with other solutions using more switches.