Distributed Active Synchronization Strategy for Microgrid Seamless Reconnection to the Grid Under Unbalance and Harmonic Distortion


Microgrids will operate in each grid-connected and islanded modes. In order to seamlessly transfer from islanded to grid-connected modes, it is necessary to synchronize microgrid voltage and frequency, and phase to the main grid. However, since the microgrid is typically based on Power Electronic converters, the synchronization method is sort of different compared with the quasi-synchronism control in typical Power Systems. 1st, so as to deal with this concern, the microgrid synchronization criteria are derived. Primarily based on these criteria, a novel distributed active synchronization strategy is proposed, that takes into account not solely the fundamental element, but conjointly positive and negative sequences of the harmonic components. This approach, a seamless reconnection to the main grid will be performed. The proposed methodology is implemented in the secondary control level of a hierarchical control structure. Real-time hardware-in-the-loop results show the feasibility of the proposed technique.

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