What is interoperability in microgrids?
In general interoperability reffers to the ability of different peices of equipment, usually that were designed/built by different companies, to operate together as part of a system.

Presumablly in the case of the microgrid system (disclaimer, I know nothing about microgrids other than what i've found from a quick google) this reffers to the devices that make up the microgrid operating together to maintain the desired behaviour even when the microgrid is built up with devices from a range of vendors.