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 · MRDSF
Microgrid resource dispatch saturation flag
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
Reports that a controlled resource has reached its assigned active-power operating bound.
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 “Requested and permitted resource power” at the input and “Dispatch-limit indication” at the output. The flag should identify the limiting constraint.
What the drawings help you do
Start at the named input: Requested and permitted resource power. Identify its source device or document and the state represented on the drawing. Follow the named output: Dispatch-limit indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Requested and permitted resource power
- Output
- Dispatch-limit indication
- 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 · MRDSF
What it represents
Reports that a controlled resource has reached its assigned active-power operating bound. 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 “Requested and permitted resource power” at the input and “Dispatch-limit indication” at the output. The flag should identify the limiting constraint.
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: Requested and permitted resource power. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Dispatch-limit indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The flag should identify the limiting constraint.
- 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 requested and permitted resource power.
- Identify the destination and defined state of dispatch-limit indication.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The flag should identify the limiting constraint.
A distinction that matters
The flag should identify the limiting constraint. 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.
Explore related references
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.