# Microgrid PCC export-limit controller

Canonical URL: https://eloragrid.ai/symbols/microgrid-pcc-export-limit-controller
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MPEC
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: PCC export measurement and limit
Output: Export-control adjustment

Requests resource adjustments when measured export approaches the assigned connection limit.

## In plain English

### What this block does

Requests resource adjustments when measured export approaches the assigned connection limit.

### A simple example

In a microgrid with solar generation, a battery and generators, the controller can allocate an import/export target among the available resources while reserving the power needed for operating disturbances. For this reference, the drawing identifies “PCC export measurement and limit” at the input and “Export-control adjustment” at the output. Protection can provide a separate export-related function.

### What the drawings help you do

Start at the named input: PCC export measurement and limit. Identify its source device or document and the state represented on the drawing. Follow the named output: Export-control adjustment. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: PCC export measurement and limit
- Output: Export-control adjustment
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: PCC export measurement and limit → MPEC → Export-control adjustment
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Microgrid control systems](https://selinc.com/services/microgrids-power-management/microgrid-control-systems/)


## What it represents

Requests resource adjustments when measured export approaches the assigned connection limit. Active-power dispatch allocates the electrical work performed by the microgrid resources. A total site target, a resource power limit and the actual measured contribution are different quantities that must be connected clearly in the diagram.
In a microgrid with solar generation, a battery and generators, the controller can allocate an import/export target among the available resources while reserving the power needed for operating disturbances. For this reference, the drawing identifies “PCC export measurement and limit” at the input and “Export-control adjustment” at the output. Protection can provide a separate export-related function.
Identify the measurement boundary, power sign convention, resource limits and target priority. An original control block does not supply dispatch settings, a financial operating policy or proof of grid-code compliance. 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 export measurement and limit. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Export-control adjustment. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Protection can provide a separate export-related function.
- Identify the measurement boundary, power sign convention, resource limits and target priority. An original control block does not supply dispatch settings, a financial operating policy or proof of grid-code compliance.

## Information to show or reference

- Label the source and connection reference for pcc export measurement and limit.
- Identify the destination and defined state of export-control adjustment.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Protection can provide a separate export-related function.

## Important distinction

Protection can provide a separate export-related function. 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.

## Facts

- Representation: Functional block
- Installation focus: Microgrids
- Input / boundary: PCC export measurement and limit
- Output / connection: Export-control adjustment
- Lookup label: MPEC is a library lookup label, not a standard device designation.

## Public references

- [Microgrid control systems](https://selinc.com/services/microgrids-power-management/microgrid-control-systems/) — SEL. Public technical context for microgrid active-power dispatch 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.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.