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Stability and power sharing in microgrids

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The microgrid concept represents one promising solution to facilitate the integration of large shares of renewable energy sources into the electrical grid. In general, a microgrid gathers a combination of generation units, loads and energy storage elements at distribution level into a locally controllable system, which can be operated either in grid-connected mode or in islanded mode, i.e., in a completely isolated manner from the main transmission system. The present talk covers several relevant aspects in the operation of microgrids. In particular, main operation modes of inverter-interfaced generation units are reviewed and a model of a microgrid is presented. Furthermore, three important performance criteria in such networks are introduced, namely frequency stability, voltage stability and power sharing. Control schemes to address these problems are discussed. The analysis is illustrated via simulation examples of a microgrid based on the CIGRE benchmark medium voltage distribution network.

This talk is part of the CUED Control Group Seminars series.

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