GFM
Grid-forming inverter
An inverter controlled as a voltage source that sets its own voltage and frequency, able to energise and hold up an island.
SLD
Functional block · MPPC
Microgrid PCC power-factor controller
Functional block · Microgrids
An independently authored application reference. The drawing shows the named function or circuit relationship; use the project legend and selected equipment documentation for its drafting form and connections.
Browse this installation focusIn plain English
What this block does
Controls the documented PCC power-factor objective using compatible resource reactive-power interfaces.
A simple example
In an islanded microgrid, the assigned reference source supports bus voltage while other compatible resources share reactive demand according to the selected control method. Grid-connected operation can use a different objective at the PCC. For this reference, the drawing identifies “PCC active and reactive measurements” at the input and “Power-factor control demand” at the output. Low active power can affect target interpretation.
What the drawings help you do
Start at the named input: PCC active and reactive measurements. Identify its source device or document and the state represented on the drawing. Follow the named output: Power-factor control demand. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- PCC active and reactive measurements
- Output
- Power-factor control demand
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: Microgrid control systems
Schematic · MPPC
What it represents
Controls the documented PCC power-factor objective using compatible resource reactive-power interfaces. 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.
In an islanded microgrid, the assigned reference source supports bus voltage while other compatible resources share reactive demand according to the selected control method. Grid-connected operation can use a different objective at the PCC. For this reference, the drawing identifies “PCC active and reactive measurements” at the input and “Power-factor control demand” at the output. Low active power can affect target interpretation.
Show each measured quantity, target and resource capability limit. Control-loop tuning, equipment capability and parallel operation require a validated design rather than an assumed property of the symbol. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.
How to read it
- Start at the named input: PCC active and reactive measurements. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Power-factor control demand. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Low active power can affect target interpretation.
- Show each measured quantity, target and resource capability limit. Control-loop tuning, equipment capability and parallel operation require a validated design rather than an assumed property of the symbol.
Information to show or reference
- Label the source and connection reference for pcc active and reactive measurements.
- Identify the destination and defined state of power-factor control demand.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Low active power can affect target interpretation.
A distinction that matters
Low active power can affect target interpretation. 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.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Microgrid control systems
Public technical context for microgrid voltage and reactive-power controls. Active and reactive power, generation, load control, operating reserves and system supervision. The application text and educational graphic are independently authored; the publisher does not certify this representation.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
Explore related references
STATCOM
Static synchronous compensator
A voltage-source converter in shunt that injects or absorbs reactive current to support voltage, independent of system voltage.
SLD
MIVB
Microgrid island voltage-reference block
Provides the assigned voltage target to the resource establishing the island AC reference.
Functional block
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.