This guide covers the design and selection of protective devices and the coordination between them for various modes of operation of the microgrid. Mukesh Nagpal Rafael Garcia Raluca Lascu Randy Hamilton Ratan Das Rob Fowler S. (Mani) Venkata Sakis Meliopoulos Sukumar Brahma Vahid Madani Wayne Hartmann Xiangyu Ding Yuan Liao Microgrid Protection Systems ii KEYWORDS Microgrid, Protection, Relaying, Fault, Grid-Isolated. Microgrids require control and protection systems. The design of both systems must consider the system topology, what generation and/or storage resources can be connected, and microgrid operational states (including grid-connected, islanded, and transitions between the two). Operating and. A microgrid control system and a microgrid protection system are required for microgrid deployment. The nature of the microgrid assets, which may include a significant amount of distributed energy resources, and the modes of operation, either grid-connected or islanded, need to be considered in the. The protection requirement of these two types differs as the protection needs of an independent microgrid are intended for protecting components and systems within the microgrid, whereas a grid connected microgrid demands both internal and external protection. The first part of this chapter is. Microgrids help leverage these DERs to keep the power on when the normal supply is unavailable (e., due to faults or equipment outages). The Power System Relaying and Control (PSRCC) committee recently. The integration of high-penetration grid-forming/grid-following (GFL/GFM) distributed generators (DGs) and energy storage systems (ESSs) constitute complex, decentralized medium-voltage microgrids. This results in stochastic power flow and variable fault characteristics, complicating fault analysis.