Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

MDRI

Symbols

Microgrid dynamic-compensator reference interface

Sends the assigned reactive or voltage target to the selected compensator control system. Voltage and reactive-power control coordinate the AC operating condition of the microgrid resources. A voltage target, reactive-power target and power-factor target represent different control objectives and should have explicit ownership.

Drawing use: Schematic
Application: Microgrid systems
Reference family: Manufacturer

A distinction that matters

The compensator's accepted mode must be identified. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

GFM

Symbols

Grid-forming inverter

A grid-forming inverter controls its output as a voltage source behind an impedance, setting voltage magnitude and frequency itself rather than measuring and following them. This lets it start a dead microgrid, share load with other sources through droop or virtual synchronous machine control, and respond instantly to load steps.

Drawing use: SLD
Application: Microgrid systems
Reference family: IEC / IEEE / ANSI

A distinction that matters

A grid-forming inverter sets voltage and frequency; a grid-following inverter injects current synchronised to a voltage that something else provides.

Full reference

Follow the full entry for source drawings and the appropriate standard or selected product. Equipment previews show a manufacturer drawing where available, otherwise a 3D thumbnail.