  The rapid increase of distributed energy resources has led to the widespread
deployment of microgrids. These flexible and efficient local energy grids are
able to operate in both grid-connected mode and islanded mode; they are
interfaced to the main power system by a fast semiconductor switch and commonly
make use of inverter-interfaced generation. This paper focuses on inverter
interfaced microgrids, which present a challenge for protection as they do not
provide the high short-circuit current necessary for conventional
time-overcurrent protection. The application of admittance relaying for the
protection of inverter-interfaced microgrids is investigated as a potential
solution. The comparison of analytical and simulated results of performed four
experiments prove the suitability of admittance relaying for microgrids
protection.
