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Definitions
| Term | Definition |
|---|
| distributed energy resource | Source of electric power that is not directly connected to a bulk power transmission system including both generators and energy storage technologies. |
| electric power system | Facilities to deliver electric power to one or more loads. The term is typically used as a generalization of a wide area grid such as a national power grid. |
| energy management system | A system of computer-aided tools used to monitor, control, and optimize the performance of the generation, transmission and distribution of electric power. |
| independent system operator | An organization that coordinates, controls, and monitors the operation of the electric power system, usually within a single US state, but sometimes encompassing multiple states. |
| islanding | The process by which a power system is split into two or more segments, each operating autonomously with its own energy resources such as occurs when a microgrid disconnects from the utility grid. |
| microgrid | A group of interconnected loads and distributed energy resources with clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid that may connect and disconnect from the grid to enable it to operate in both grid-connected or island modes. |
| microgrid controller | A device that implements a microgrid control system. |
| microgrid control system | A system of control functions that permits a microgrid to manage distributed energy resources and loads to maintain acceptable frequency and voltage, operate autonomously and connect or disconnect from a utility grid, including its energy management system. |
| microgrid energy management system | The energy management system used by a microgrid. |
| nanogrid | A single domain of power—for voltage, capacity, reliability, administration, and price. |
| point of common coupling | The point where a microgrid attaches to a wider area grid such as a utility grid. |
| point of interconnect | See: point of common coupling. |
Acronyms
| Acronym | Definitions |
|---|
| DER | distributed energy resource |
| EMS | energy management system |
| EPS | electric power system |
| ISO | independent system operator or International Organization for Standardization |
| MEMS | microgrid energy management system |
| PCC | point of common coupling |
| POI | point of interconnect |