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Two smart-grid topologies are analyzed in this paper. The first one has two main differences from the traditional grid, a dc-bus and a smart integration module (SIM), which interconnects the dc-with the ac-bus. The second topology has only one difference from the traditional grid, a special control unit (SCU), which is attached to each device before connecting to the grid. The first topology has been implemented in a small-scale installation. This small-scale pilot installation is described and experimental results are presented. These results verify the predicted disadvantages of the first topology. It is expected that these disadvantages will be eliminated by using the second topology. This paper also presents the design of the second topology.

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In order to make smart grid feasible, the respective (a) topology and (b) control infrastructure should be determined first for the low level of the grid, i.e. microgrids or even smaller grids like a residential in-house grid, and be expandable in a larger scale. Additionally, the experimental investigation of properly designed interconnected microgrids could simulate the behavior of the whole distribution grid and thus facilitate in the transition from the traditional to the smart electric grid. Two smart grid topologies are presented in this paper. The respective infrastructure for two small-scale microgrids, one for each topology, is presented. A first comparison between the two topologies is outlined and verified by the experimental investigation of the respective microgrids.