Importance

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Abstract

The application relates to a method for protecting a microgrid from a voltage drop or sag occurring in a main grid connected to said microgrid, the method comprising the following steps:

a. supplying (105) power to the microgrid through the main grid;b. ascertaining that the voltage drop or sag is occurring in the main grid by executing the following steps: i. measuring (110) an instantaneous output voltage;ii. comparing (130) the measured instantaneous output voltage with a reference instantaneous output voltage;iii. Incrementing (140) a counter when the measured instantaneous output voltage differs from the reference instantaneous output voltage by more than a voltage threshold; andiv. ascertaining (150) that the voltage drop or sag is occurring in the main grid when the counter holds a value that exceeds a counter threshold; and c. disconnecting the microgrid from the main grid when the voltage drop or sag occurring in the main grid has been ascertained.

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First Claim