The EZA controller (Energieerzeugungsanlagen-Regler or Power Generation Plant Controller) and the Redispatch function are closely linked, but they are not the same thing.
To summarize this with a metaphor:
The EZA controller is the car's autopilot and steering wheel. It ensures the car stays neatly on the road and drives at the right speed.
Redispatch is the traffic control. It sends the command: "Slow down to 80 km/h because there is a traffic jam ahead."
The EZA controller (often called a Power Plant Controller) is the brain on location. Its task is to continuously ensure that the installation meets the strict technical requirements of the grid operator (such as the German VDE standards VDE-AR-N 4110 and 4105).
What does it do?
It actively adjusts Reactive Power (Q) and Active Power (P) to keep the voltage and frequency locally stable.
Function:
It ensures the installation is "grid-compliant." Without this specific function, larger installations (typically >135 kW) are strictly prohibited from connecting to the grid.
Redispatch is the process used by the grid operator to resolve power grid congestion. It is the command that comes from the outside.
What does it do?
It is purely a communication interface that listens for specific signals from the grid operator (e.g., "There is congestion, reduce production to 60% now").
It also handles the logging required for Redispatch 2.0 legislation. This is crucial for financial settlement: it ensures you get paid for the electricity you were technically capable of producing but were not allowed to supply due to the grid command.
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