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 · MPCC
Microgrid PV curtailment confirmation
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.
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What this block does
Checks the declared acceptance or measured effect of an assigned PV power restraint.
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 “Curtailment request and response” at the input and “Curtailment confirmation” at the output. Command acceptance and delivered power differ.
What the drawings help you do
Start at the named input: Curtailment request and response. Identify its source device or document and the state represented on the drawing. Follow the named output: Curtailment confirmation. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Curtailment request and response
- Output
- Curtailment confirmation
- 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 · MPCC
What it represents
Checks the declared acceptance or measured effect of an assigned PV power restraint. 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 “Curtailment request and response” at the input and “Curtailment confirmation” at the output. Command acceptance and delivered power differ.
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: Curtailment request and response. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Curtailment confirmation. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Command acceptance and delivered power differ.
- 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 curtailment request and response.
- Identify the destination and defined state of curtailment confirmation.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Command acceptance and delivered power differ.
A distinction that matters
Command acceptance and delivered power differ. 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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