BESS
Battery energy storage system
A complete battery plant block combining batteries, power conversion and controls, shown as one source or sink on an SLD.
SLD
Functional block · MSPI
Microgrid storage precharge-complete interface
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
Receives the storage system's documented precharge completion state.
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 “Precharge state” at the input and “Converter connection readiness” at the output. The detailed precharge sequence is equipment-specific.
What the drawings help you do
Start at the named input: Precharge state. Identify its source device or document and the state represented on the drawing. Follow the named output: Converter connection readiness. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Precharge state
- Output
- Converter connection readiness
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: Avista Shared Energy Economy microgrid protection and control case study
Schematic · MSPI
What it represents
Receives the storage system's documented precharge completion state. 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 “Precharge state” at the input and “Converter connection readiness” at the output. The detailed precharge sequence is equipment-specific.
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: Precharge state. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Converter connection readiness. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The detailed precharge sequence is equipment-specific.
- 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 precharge state.
- Identify the destination and defined state of converter connection readiness.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The detailed precharge sequence is equipment-specific.
A distinction that matters
The detailed precharge sequence is equipment-specific. 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.
Avista Shared Energy Economy microgrid protection and control case study
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.
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
PCS
Battery power conversion system
The bidirectional inverter stage of a battery plant that charges and discharges the DC battery from the AC network.
SLD
MSTI
Microgrid storage thermal-derating input
Receives the declared storage operating-limit reduction associated with thermal conditions.
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.