| Abstract: |
| Multi-microgrids have many new characteristics, such as bi-directional power flow, flexible operation and variable fault
current consisting of the different control strategy of inverter interfaced distributed generations (IIDGs), which all
present challenges in multi-microgrid protection. In this paper, the current and voltage characteristics of different
feeders are analyzed considering faults at different locations of the multi-microgrid. Based on the voltage and current
distribution characteristics of the line parameters, a new protection scheme for the internal faults of multi-microgrids is
proposed, which takes the change of phase difference and amplitude of measured bus admittances as the criterion.
This proposed scheme has high sensitivity and reliability, is based on a simple principle, and can be easily adjusted.
Simulation results using PSCAD/EMTDC verify the correctness and effectiveness of the protection scheme. |
| Key words: Microgrid, Multi-microgrid, Measured admittance, Protection scheme |
| DOI：10.1186/s41601-019-0127-3 |
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| Fund: |
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