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The recent grid integration of Distributed Energy Resources (DER) possibility the formation of
intentional islands in the case of a grid fault conditions. For such island formation is required an active
agent capable of governing the micro-grid connection state in a safe mode, especially in connection
and disconnection transients. This paper focuses on the design of a method oriented to carry out a
stable intentional disconnection, and later re-connection, of local grids from the main distribution grid
in an intentional way; also under unbalance load condition. Seamless transfer between grid-connected
and isolated mode has been achieved in an alpha-beta stationary reference frame with a frequency
based synchronization control loop. Simulation and experimental results are provided to verify the
proper performance of the proposed solution.
CitationRocabert, J. [et al.]. Connection and disconnection transients for micro-grids under unbalance load condition. A: European Conference on Power Electronics and Applications. "Proceedings of the 2011-14th European Conference on Power Electronics and Applications (EPE 2011)". Birminghan: 2011, p. 1-9.
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