Method and device for networked protection of microgrid

The invention discloses a method and a device for networked protection of a microgrid. Voltage and current information of a line is collected through intelligent electronic devices (IEDs) dispersedly installed on a main transformer, a bus and two sides of a power grid line; a main power grid is judged to break down or not according to a set fault detection method; operating states of the main power grid and the microgrid are monitored continuously when the main power grid is judged to operate normally, a networked monitoring system is put into operation when the main power grid is judged to break down, the intelligent electronic devices (IEDs) first judge a line on which a fault occurs according to fault direction information, and then send fault judgment information to a protection control host. According to the invention, real-time monitoring is carried out on the microgrid by adopting a networked protection system, thereby enabling the microgrid protection to become an organic unity, coordinating with each other, realizing protection for the selectivity, the rapidity, the sensitivity and the reliability of the microgrid, ensuring safe and stable operation of the microgrid system, and improving the utilization rate and the reliability of distributed generation (DG).