# Microgrid storage dispatch direction selector

Canonical URL: https://eloragrid.ai/symbols/microgrid-storage-dispatch-direction-selector
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MSDDS
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Dispatch request and limits
Output: Signed storage power target

Selects the permitted charge or discharge target under the current control authority.

## In plain English

### What this block does

Selects the permitted charge or discharge target under the current control authority.

### A simple example

In a microgrid with a battery energy storage system, the controller can request discharge to support a power deficit while the battery management and conversion systems enforce their own operating limits. For this reference, the drawing identifies “Dispatch request and limits” at the input and “Signed storage power target” at the output. The power sign convention must be explicit.

### What the drawings help you do

Start at the named input: Dispatch request and limits. Identify its source device or document and the state represented on the drawing. Follow the named output: Signed storage power target. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Dispatch request and limits
- Output: Signed storage power target
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Dispatch request and limits → MSDDS → Signed storage power target
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/)


## What it represents

Selects the permitted charge or discharge target under the current control authority. Storage coordination combines the battery's energy limits with the converter's electrical capability and the microgrid's operating demand. State of charge, allowable power and connection status describe different aspects of availability.
In a microgrid with a battery energy storage system, the controller can request discharge to support a power deficit while the battery management and conversion systems enforce their own operating limits. For this reference, the drawing identifies “Dispatch request and limits” at the input and “Signed storage power target” at the output. The power sign convention must be explicit.
Show which system declares each limit and which controller receives the target. Battery protection, converter capability, thermal management and emergency responses remain with the selected system design. 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: Dispatch request and limits. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Signed storage power target. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The power sign convention must be explicit.
- Show which system declares each limit and which controller receives the target. Battery protection, converter capability, thermal management and emergency responses remain with the selected system design.

## Information to show or reference

- Label the source and connection reference for dispatch request and limits.
- Identify the destination and defined state of signed storage power target.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The power sign convention must be explicit.

## Important distinction

The power sign convention must be explicit. 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: Dispatch request and limits
- Output / connection: Signed storage power target
- Lookup label: MSDDS is a library lookup label, not a standard device designation.

## Public references

- [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/) — SEL. Public technical context for microgrid storage coordination interfaces. Storage, protection, black start, load restoration and coordinated island operation. 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.