Microgrid relay protection at home and abroad

Are multifunction protective relays a good choice for Microgrid controls?

Multifunction protective relays are an economical choice for microgrid controls because the hardware is commonly required at the point of interface (POI) to the electric power system (EPS) and at each distributed energy resource (DER). The relays at the POI and DER provide mandatory protection and human safety.

What is a microgrid relay?

In smaller microgrids, relays are commonly utilized for control, metering, and protection functions. In larger microgrids, the functionality of the microgrid controls is predominantly performed in one or more centralized controllers.

Do microgrid relays perform well in macrogrids?

Although years of operation in macrogrids support these relays, their performance for microgrids is yet to be analyzed. This paper presents such analysis for different relay types by considering various fault and generation conditions in a microgrid.

Can a microgrid provide a fault analysis for different relay types?

This paper presents such analysis for different relay types by considering various fault and generation conditions in a microgrid. Time-domain simulations are used to identify the scenarios where the relays function correctly as well as the problematic conditions, on which future research should focus.

Can a microgrid improve the performance of OC relays in blinding zones?

The presence of a microgrid causes many challenges in the protection of the power system. This study addressed these challenges and their solutions. Changing the protective relay settings and the optimal replacement of reclosers have been proposed to improve the performance of OC relays in blinding zones.

How to protect a microgrid?

Conventional protection of microgrids is usually based on the overcurrent principle using either definite time or inverse definite OC relays.