A microgrid is capable of operating by itself or when connected to the grid, e.g.
"A microgrid is a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid• A microgrid can connect and disco,/emnne,/emct from the grid to enable it to operate in both grid-connected or island mode" - IEEE Microgrids Presentation
- Books contains some handbooks and references.
- Talks has a few presentations including a Brief History of Islanded Systems using Renewable Energy and PV Diesel 101.
- Grid Forming Inverter Test and Assessment - Marc Muellor Stoffels, et al.