© 2023 by XOLTA
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5.2.2 External control
The XOLTA Outdoor BESS is able to react to power setpoints received from external systems.
An interface (web API) is provided which allows the user to decide the active power (P) and reactive
power (Q) in all four quadrants. This mode is ideal for users who would like to develop their own
control algorithm. It is also used for an installation functional check when a XOLTA technician is
doing on-site commissioning. There are two different formats of external control:
• Single setpoint: System will work upon the single setpoint. The input can only be one value at a time.
• Schedule: System will work on a pre-defined time schedule. It can be one value or a list of values.
The limitation of P-setpoints is constrained by the maximum apparent input/output power of the
inverter and the local grid capacity. Q-setpoints are limited by the power factor and the P measurement.
Positive and negative P-setpoints stand for battery charging and discharging. Positive and negative
Q-setpoints stand for BESS-producing inductive and capacitive reactive power. A detailed XOLTA
cloud API instruction can be provided on request.
5.2.3 Grid support
Grid support includes various grid services that comply with the local grid code and capabilities
of the local electricity market activities, such as frequency support and voltage support.
For specific requests please contact XOLTA support at
.
5.2.3.1 Load following
Load following is an operational mode used to support one or more user-specified loads.
The XOLTA system tracks the loads in real-time and provides power as needed.
5.2.3.2 Grid voltage support
Grid voltage support is an operational mode intended to support stabilization of the local grid voltage.
Depending on the grid status, the XOLTA System can offer different control mechanisms to minimize
the local grid voltage variations, as shown in Figure 5.6 and Figure 5.7.
Figure 5.5:
Example of grid
voltage distribution
with and without grid
voltage support mode
0.200
0.175
0.150
0.125
0.100
0.075
0.050
0.025
0.000
227.5
230.0
232.5
235.0
Voltage [V]
Phase 3
Phase 3 support
Pr
obability density
237.5
240.0
242.5
