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Numerous benefits promote the proliferation of renewable and distributed energy resources in power grids. Some recent research has focused on the concept of microgrids, in which a number of renewable energy sources can be connected together to supply power to customers as a complement to traditional power sources or as main power sources. In a microgrid, multiple distributed energy sources are operated...
When multiple three-phase voltage source converters sharing the same DC bus are operated in parallel to supply an AC voltage bus or a load, a zero-sequence path exists. With this path, a zero-sequence circulating current is introduced into the three-phase system, which may be caused by the circuit asymmetry. The zero-sequence circulating currents introduce further asymmetry of electrical variables...
Multiple three-phase voltage source converters may be connected in parallel to supply an AC voltage bus or a load in excess of the rating of an individual power converter. Without a circulating path, a zero-sequence current generally does not exist in a single power converter; however, it typically exists in parallel-connected three-phase power converters. The presence of zero-sequence currents in...
Due to the rapid increase in global energy consumption and the diminishing of fossil fuels, the customer demand for new generation capacities and efficient energy production, delivery and utilization keeps rising. Utilizing distributed generation, renewable energy and energy storage can potentially solve such problems as energy shortage and global warming. A promising structure to interconnect these...
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