# Microgrid active-power control ownership selector

Canonical URL: https://eloragrid.ai/symbols/microgrid-active-power-control-ownership-selector
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MACOS
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Competing control authorities
Output: Selected active-power authority

Selects which authorized control function currently determines the assigned power target.

## In plain English

### What this block does

Selects which authorized control function currently determines the assigned power target.

### 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 “Competing control authorities” at the input and “Selected active-power authority” at the output. Target priority must avoid conflicting requests.

### What the drawings help you do

Start at the named input: Competing control authorities. Identify its source device or document and the state represented on the drawing. Follow the named output: Selected active-power authority. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Competing control authorities
- Output: Selected active-power authority
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Competing control authorities → MACOS → Selected active-power authority
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

Selects which authorized control function currently determines the assigned power target. 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 “Competing control authorities” at the input and “Selected active-power authority” at the output. Target priority must avoid conflicting requests.
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: Competing control authorities. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Selected active-power authority. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Target priority must avoid conflicting requests.
- 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 competing control authorities.
- Identify the destination and defined state of selected active-power authority.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Target priority must avoid conflicting requests.

## Important distinction

Target priority must avoid conflicting requests. 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: Competing control authorities
- Output / connection: Selected active-power authority
- Lookup label: MACOS 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.