13 Grid Management Services
13.1 Options for Implementing Grid Management Service
Setpoints
You can have the ClusterController implement the grid management service setpoints by using
open-loop or closed-loop control.
In the event that the ClusterController evaluates a setpoint as invalid or does not receive a setpoint
within a configurable interval, you can make additional settings for the fallback (see Section13.5,
page70).
The setpoint for active power limitation is specified in percent. The total system power is taken as
the reference value. By default, the system inverter power determined by the ClusterController is set
as the value for the total system power. If necessary, you can adjust the value when configuring the
active power limitation.
Open-loop control
For ClusterController systems without self-consumption and with direct limitation of active power
feed-in, the operating mode Open-loop control is used. In this operating mode, the
ClusterController can receive the grid management service setpoints from three different types of
signal source. The different signal sources can be combined:
Type of setpoint signal Explanation
Digital signals The setpoints are transmitted to the ClusterController as
digital signals in the form of binary values. Up to four re-
lay contacts can be used for the active power limitation
and the reactive power setpoint.
Analog signals The setpoints are transmitted to the ClusterController as
analog current signals. Current signals from 0mA to
20mA can be transmitted for the active power limitation
and the reactive power setpoint.
Setpoint signal via Modbus client The setpoints are transmitted via a Modbus client to the
network port X13 or X14 on the ClusterController (for in-
formation on Modbus configuration, see Section12,
page60).
Closed-loop control
For ClusterController systems with self-consumption, the operating mode Closed-loop control is
used. In this operating mode, you can regulate the active power fed in by the system at the grid-
connection point and limit it e.g. to a fixed percentage value. In addition to the total system power,
the ClusterController needs the measured actual value of the active power fed in at the grid-
connection point.
13 Grid Management Services
SMA Solar Technology AG
User ManualClusterController-BA-en-1562
To Next Page
Loading...
Need help?
General
