INV STR
PV string inverter
A solar inverter connecting a small number of PV strings directly, each group tracked by its own MPPT input.
SLD
Functional block · MPEI
Microgrid PV export-restraint 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
Connects the assigned site export-control demand to the PV dispatch limiter.
A simple example
In a microgrid with solar generation, the controller can restrain inverter output when local load and storage cannot absorb the available power. The resource controller reports its own availability and accepted operating limits. For this reference, the drawing identifies “Site export limit demand” at the input and “PV output restraint” at the output. Other resources can also affect PCC export.
What the drawings help you do
Start at the named input: Site export limit demand. Identify its source device or document and the state represented on the drawing. Follow the named output: PV output restraint. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Site export limit demand
- Output
- PV output restraint
- 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 processing and control functions
Schematic · MPEI
What it represents
Connects the assigned site export-control demand to the PV dispatch limiter. Renewable-generation coordination connects variable resource availability, inverter operating limits and the microgrid power target. Available solar or wind power, an issued curtailment request and actual delivered power are different signals.
In a microgrid with solar generation, the controller can restrain inverter output when local load and storage cannot absorb the available power. The resource controller reports its own availability and accepted operating limits. For this reference, the drawing identifies “Site export limit demand” at the input and “PV output restraint” at the output. Other resources can also affect PCC export.
Identify the point where power is measured and the system declaring each availability or limit signal. Resource forecasts and controller requests do not guarantee the delivered generation at every instant. 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: Site export limit demand. Identify its source device or document and the state represented on the drawing.
- Follow the named output: PV output restraint. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Other resources can also affect PCC export.
- Identify the point where power is measured and the system declaring each availability or limit signal. Resource forecasts and controller requests do not guarantee the delivered generation at every instant.
Information to show or reference
- Label the source and connection reference for site export limit demand.
- Identify the destination and defined state of pv output restraint.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Other resources can also affect PCC export.
A distinction that matters
Other resources can also affect PCC export. 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 processing and control functions
Public technical context for microgrid renewable-generation interfaces. Renewable generation dispatch and microgrid source coordination. 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.
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