Generator Microgrid Relay Protection

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.

Can dual-setting overcurrent relays be used in a microgrid test system?

Thus, the proposed protection scheme using dual-setting overcurrent relays also provides the common optimal relay settings for larger test system such as the 18-bus microgrid test system which can be used in both operating modes.

Can a voltage based relay protect micro-grids dominated by embedded generation?

Al-Nasseri, H. & Redfern, M. A., A new voltage based relay scheme to protect micro-grids dominated by embedded generation using solid state converters, in Proceedings of 19th international conference on electricity distribution.

How to protect a microgrid?

It is important to make sure that the protection schemes can detect and respond to faults inside and outside of the microgrid and maintain coordination between protective devices in both grid-interconnected and grid-isolated modes, and in the presence of varying numbers and types of sources.

How to protect a microgrid from a faulty circuit breaker?

In the grid-connected mode protection schemes of microgrids should not operate unnecessarily for faults outside the microgrid for example faults upstream of the circuit breaker (CB) at the point of common coupling (PCC). All faults insides the microgrid should be detected and selectively isolated for the minimum interruption to other parts.