PPC
Power plant controller
The plant-level controller that measures at the connection point and sets inverter or turbine outputs to meet grid requirements.
SLD
Functional block · MACE
Microgrid available-generation capacity estimator
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
Combines declared resource availability and power limits into the selected generation capacity quantity.
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 “Resource availability and limits” at the input and “Available generation estimate” at the output. An estimate is different from guaranteed delivered power.
What the drawings help you do
Start at the named input: Resource availability and limits. Identify its source device or document and the state represented on the drawing. Follow the named output: Available generation estimate. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Resource availability and limits
- Output
- Available generation estimate
- 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 control systems
Schematic · MACE
What it represents
Combines declared resource availability and power limits into the selected generation capacity quantity. 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 “Resource availability and limits” at the input and “Available generation estimate” at the output. An estimate is different from guaranteed delivered power.
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: Resource availability and limits. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Available generation estimate. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- An estimate is different from guaranteed delivered power.
- 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 resource availability and limits.
- Identify the destination and defined state of available generation estimate.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: An estimate is different from guaranteed delivered power.
A distinction that matters
An estimate is different from guaranteed delivered power. 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 control systems
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.
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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Functional block
Put the reference into a drawing workflow.
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