Switching principles of microgrid mode
The operating modes of microgrids are known and defined as follows 104, 105: grid-connected, transited, or island, and reconnection modes, which allow a microgrid to increase the reliability of energy supplies by disconnecting from the grid in the case of network failure or reduced power quality. 106, 107 In the islanded (standalone) operating .
The operating modes of microgrids are known and defined as follows 104, 105: grid-connected, transited, or island, and reconnection modes, which allow a microgrid to increase the reliability of energy supplies by disconnecting from the grid in the case of network failure or reduced power quality. 106, 107 In the islanded (standalone) operating .
Most of the reviewed microgrids have the ability to switch from grid-connected operation to islanded operation following a non-planned event or by means of a planned transition. The formation of an emergency island can be considered as the worst contingency for the survival of a microgrid.
In grid connected mode, microgrid acts as a controllable load/source. It should not actively regulate the voltage at the point of common coupling (PCC). Its main function is to satisfy its load requirements with good citizen behavior towards main grid.
Inheriting the capability to operate in grid-connected and islanded mode, the microgrid demands a well-structured protectional strategy as well as a controlled switching between the modes. This challenging task is dealt with in this study, by the proposed centralized smart mode transition controller (CSMTC).
4.3 Switching Controls. The need for switching controls of the DERs on MG islanding event stems from the widely used practice in the literature of operating dispatchable DERs with different control strategies to achieve the objectives of PQ control, in grid-connected mode, and Vf control, in islanded mode [5, 8, 9]. In the event of MG islanding .
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