چكيده به لاتين
The operation status of the microgrid, depending on the level of exchanges between the microgrid and the main grid, can be classified as connected to the grid and the island. In island mode, there is no connection between the microgrid and the main grid, and the microgrid becomes stable independently. Due to changes in the short-circuit current level in these two operating conditions, the design of a protection system for microgrids is challenging. One of the protection methods in microgrids, due to the two way power flux, is the use of directional overcurrent relays. These protection relays operate based on a time-reverse current characteristic, which depends on two variables: time adjustment and current regulation. Optimization methods can be used to solve the problem of protection coordination between primary relays and backups in microgrids. One way to get the optimal settings for directional overcurrent relays is to use a combination of genetic algorithm and linear programming. In this thesis, the problem of protection coordination optimization by analyzing the possible conditions of N-1 due to the exit or disconnection of a line, distribution substation or distributed generation in different modes of microgrid performance is examined. In this analysis, directional overcurrent relays have been used as the main protection in radial and meshed systems that have synchronous distributed generation. Simulations were performed in DIgSILENT software and coding was performed in MATLAB software.
