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Controller settings
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Note
The content on this page refers only to the blue'Log XC combined with the Hybrid EMS licence.
Under Power control > Active power > Controller settings, you can adjust the active power control behavior depending on system-specific and regulatory requirements. You can also adjust the PV and battery controller individually here.
General parameters
Controller sampling time
The controller sampling time defines how frequently the controller calculates a new correction value. Although the sampling time can be adjusted in both the reactive power and active power menus, it is a global setting. If the sampling time is changed in the reactive power control menu, it is automatically updated in the active power control menu as well. The default setting is 500 ms. A new correction value is calculated every 500 ms.
Setpoint reference
For relative setpoint commands at the grid connection point, the controller requires a so-called Setpoint reference so that it can interpret relative setpoint commands (setpoints in percent, e.g., 50%).
Under Power control > Active power > Controller settings > Setpoint reference, select one of the following values:
Agreed connected active power PAV
Total installed active power Pinst
Total maximum apparent power Smax
You must configure these values under Power Control > Plant data. See Plant data (Hybrid EMS).
Example
The Setpoint reference is configured as PAV = 1 MW. A relative feed-in limitation command by the grid operator of 50% is translated by the controller to 1 MW * 50 % = 500 kW.
Consequently, the power at the grid connection point will be limited to a feed-in of 500 kW.
Control criterion
The control criterion determines which measured value is used for active power control:
Active power sum: Sum of the phases L1, L2, and L3.
Phase-related: The highest value of the three phases is multiplied by 3.
Example
The active power measurement of the three phases is:
PL1 = 400 kW, PL2 = 410 kW PL3 = 400 kW
The active power sum and the phase-related value are:
Active power sum: 1210 kW
Phase-related: 3 * 410 kW = 1230 kW
The Active power sum is used as the control criterion by default. In cases where the single phases should not exceed a certain limit (e.g., zero feed-in systems), the Phase-related criterion can be used.
Additional controller parameters
PV and battery controller tuning
For details about the specific controller parameters for PV and battery, hover over the 
Info icons next to each parameter.
For configuration assistance, we recommend our project-specific controller tuning services. For more information, see Project-specific controller tuning blue'Log XC and contact Sales.
Battery: State of charge limitation
You can prevent the battery from fully discharging and/or overcharging by activating the State of charge limitation:
Minimum state of charge (SOC): The battery will stop charging once the maximum SOC is reached.
Maximum state of charge (SOC): The battery will stop discharging once the minimum SOC is reached.
Refer to the battery manufacturer’s recommendations for configuring these values.
Caution
The blue’Log cannot guarantee the SOC limits if multiple batteries with differing SOCs are connected! If multiple batteries are connected to the blue’Log, an overall state of charge is calculated, for example:
Battery 1: max capacity 500 kWh, SOC = 40 %
Battery 2: max capacity 200 kWh, SOC = 30 %
The overall state of charge corresponds to 37.14%:
Overall SOC = (40 % * 500 kWh + 30% * 200 kWh) / (500+200) kWh = 37.14%
The overall SOC value is used for further calculation. When the minimum SOC is set to 37.14%, the blue'Log stops charging the batteries, even though the SOC of battery 1 is 40% and the SOC of battery 2 is 30%.
We recommend using a separate battery management system (BMS) to balance the state of charge of the individual batteries.
Warning
The State of charge limitation function only limits the SOC. The function does not actively correct or return the SOC to within the defined range.
This function does not protect against deep discharge. Ensuring such protection is solely the responsibility of the battery management system (BMS).