PPC controls

Controls are commands that you configure for the GPM PPC to send to individual inverters or to the entire plant. These can be pre-defined modes for production (for example, Night Control) or individual setpoints that you can input and send manually.

Note: The different control parameters must be agreed between GPM and a representative from the client organization or the grid operator.

To find out the number of available inverters, the GPM PPC monitors the status of communication and the power available for each inverter. If the communication quality is good and the inverter is also generating, it is considered as available.

The total active and reactive power that the plant has in the POI are fixed values and are the values that are subsequently used to calculate the setpoints sent to the inverters which can be sent relative or in absolute value.

The control strategy is based on different control loop algorithms.

Control loop

The control loop consists of three steps:

Acquire the plant state, including the measurements in the POI.
Calculate commands and setpoints.
Send commands and setpoints to the equipment.

The external setpoints sent to the GPM PPC should be among the limits related to the configuration parameters. Otherwise, the setpoints values are saturated to these limits.

Available control algorithms at the point of interconnection

The available the control algorithms at the point of interconnection (POI) are:

Active power: active power curtailment.
Reactive power: reactive power reference closed-loop control.
Frequency stability: active power injection/absorption due to frequency variations.
Voltage controls:
- Droop control (characteristic curve Q-V).
- Closed-loop control.
Power factor: power factor reference closed-loop control.
Ramp control: active and reactive Power if needed.
SVC or STATCOMS: reactive compensation device.
BESS: Battery Energy Storage Station control.
Fault-handling: fault-voltage ride-through.