# Power plant controller

Canonical URL: https://eloragrid.ai/symbols/power-plant-controller
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: PPC
Drawing use: SLD
Reference families: IEC, IEEE / ANSI

The plant-level controller that measures at the connection point and sets inverter or turbine outputs to meet grid requirements.

## In plain English

### What does Power plant controller mean?

A power plant controller measures voltage, current, active and reactive power at the plant connection point and adjusts setpoints of all inverters or turbines to meet the network operator's requirements. Typical functions include active power limits, ramp rates, frequency response, voltage or reactive power control and power factor control.

### A simple example

Drawings show a control block with measurement inputs from the connection point CTs and VTs, a communication network to each inverter or turbine, and a link to the network operator's control system. A meter at the point of connection is usually the measurement source.

### What the drawings help you do

The controller's response speed is slower than the inverter internal controls, so fast events are still handled by the devices themselves. The symbol does not show control modes, settings or the response time agreed with the network operator.

### This particular reference

The plant-level controller that measures at the connection point and sets inverter or turbine outputs to meet grid requirements. A power plant controller manages one generating plant at its connection point; a microgrid controller also manages loads and islanding.

### Terms

- Terminal: An identified point where a conductor connects.
- Signal: Electrical information passed between devices, rather than necessarily the main power supply.
- Rating: A value stating the conditions for which equipment is specified.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [Solar electrical system architecture](https://www.ti.com/applications/industrial/energy-infrastructure/solar-energy/overview.html)
- [Reliable hybrid power and microgrid solutions](https://www.deif.com/applications/power-generation/reliable-hybrid-power-and-microgrid-solutions/)


## What it represents

A power plant controller measures voltage, current, active and reactive power at the plant connection point and adjusts setpoints of all inverters or turbines to meet the network operator's requirements. Typical functions include active power limits, ramp rates, frequency response, voltage or reactive power control and power factor control.
Drawings show a control block with measurement inputs from the connection point CTs and VTs, a communication network to each inverter or turbine, and a link to the network operator's control system. A meter at the point of connection is usually the measurement source.
The controller's response speed is slower than the inverter internal controls, so fast events are still handled by the devices themselves. The symbol does not show control modes, settings or the response time agreed with the network operator.

## How to read it

- Measurement comes from the connection point, not individual inverters.
- Communication dashed lines show the setpoint path.

## Information to show or reference

- List control modes and the measurement point.
- Show communication to each unit.
- Reference agreed performance settings.

## Important distinction

A power plant controller manages one generating plant at its connection point; a microgrid controller also manages loads and islanding.

## Facts

- Measurement point: Plant connection point
- Controls: P, Q, voltage, ramp, frequency response
- Targets: Inverters or turbines
- Preview: Independent educational illustration; consult the applicable standard and project legend for the exact graphic

## Public references

- [Solar electrical system architecture](https://www.ti.com/applications/industrial/energy-infrastructure/solar-energy/overview.html) — Texas Instruments. Public solar plant architecture context.
- [Reliable hybrid power and microgrid solutions](https://www.deif.com/applications/power-generation/reliable-hybrid-power-and-microgrid-solutions/) — DEIF. Public hybrid plant control context.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.