Operating data (without HEMS)

Under Power control > Operating data, you have an overview of your system data concerning power control functions. This overview is divided into several areas, which are explained in more detail below:

Operating data overview without HEMS (part1).png

Operating data overview without HEMS (part2).png — Operating data overview

Item	Name	Details
1	Controller operation	Set power control operating mode. See Controller operation
2	Plant data	Configure your plant's electrical data/characteristics. See Plant data
3	Advanced plant data	Configure measured data points that can be accessed via Modbus. See Advanced plant data
4	Configuration calculated plant data	Calculated plant data
5	Slaves	Overview of slave devices. See Slaves

Controller operation

See Master-slave mode

Plant data

You can configure the relevant electrical characteristics of your plant under Plant data. All settings are mandatory except for the extended settings.

Item	Name	Details
1	Extended settings icon	Set extended system parameters for power control operation.
2	Parameters	You can set the following parameters. Select a parameter to view more details: Agreed connected active power Pav Connected active power of the power generating system agreed upon by the grid operator and subscriber. Amount of power you are allowed to feed into the grid as agreed with the grid operator. For example, you may have 9000 kW of installed power, but you are only allowed to feed in 1000 kW (agreed active power). Agreed supply voltage Vc Usually, the grid supply voltage is equal to the nominal system voltage, V_n. If the grid operator and subscriber agree on a voltage at the point of common coupling (PCC) which is at variance with the nominal system voltage, this voltage is the agreed power supply, V_c. Agreed connected apparent power Sav The apparent power of the power generating system, which is calculated as the quotient of agreed connected active power P_av and the lowest power factor cos φ agreed upon by the grid operator and subscriber. Nominal system frequency Fn Nominal value of the grid frequency. Installed active power Pinst Located under Power control > Plant data > Extended settings icon The sum of the nominal power of every power generating unit within the power generating system. Maximum apparent power of the power generation system SA max Located under Power control > Plant data > Extended settings icon Highest 10-minute average value of the apparent power of the power generating system.
3	Choose feed-in meter	For open-loop operation, a meter is not mandatory. For more information on meters, see Meters. For more information on open/closed loop, see Closed loop vs open loop control (without HEMS)

Advanced plant data

Under Advanced plant data, you can configure an irradiance and/or temperature sensor whose data points can be accessed via Modbus.

Prerequisites

Sensors must be configured under Devices > Sensors to be visible in this area. See Sensors.
The Modbus Power Control and Remote Power Control licenses are required to access these data points. See License and License data sheets.

Advanced plant data (part1) without HEMS.png

Advanced_plant_data_ambient_temperature_sensor_without_HEMS.png

Item	Name	Details
1	Select sensor for output of global irradiation	Connect a sensor for a master or a slave. The number of sensors varies depending on the controller's operating mode (standalone, master, slave).
2	Gear icon	Open a window with additional settings for the irradiation sensor.
3	Selection of measurement value	If a device has several irradiance sensors, select the measured value to be forwarded via Modbus, e.g. irradiance W/m2
4	Advanced settings toggle	Modbus assumes that irradiance sensors are mounted horizontally. However, your sensor may be mounted directly on a PV module and at an incline. You can correct the value for Modbus output here. Toggle activated: Enter the inclination at which the sensor is mounted in degrees Toggle deactivated: No adjustment is necessary
5	Modbus power control	Displays transmission parameters from the Modbus Power Control interface. See Modbus Power Control.
6	Remote power control	Displays transmission parameters from the Remote Power Control interface. See Remote power control (without HEMS).
7	Select sensor for output of ambient temperature	Connect a sensor for a master or slave. The number of sensors will vary depending on the operating mode of the controller (standalone, master, slave).
8	Gear icon	Open a window with additional settings for the temperature sensor.
9	Selection of measurement value	If a device has multiple temperature sensors, select the measured value to be forwarded via Modbus, e.g. temperature

Calculated plant data

Grid operators, plant operators, energy traders, or balancing service providers want to know the theoretical performance of a plant to estimate its possible contribution to frequency and voltage stability. The two values "available active power" and "available reactive power" can be read via the Modbus interfaces "Modbus Power Control" and "Remote Power Control". The following provides an overview.

Item	Name	Details
1	Available active power toggle	The available active power is an estimate of what can be produced by the PV plant based on the current weather conditions and irradiation.
2	Select sensor for P_available	Here the irradiance sensor can be selected which shall be the basis for the calculation of the available active power.
3	Gear icon	A new window with additional settings opens: select the measured value, set the inclination of the irradiance sensor, and view the transmission parameters from Modbus power control and remote power control. See Master-slave-mode
4	Available reactive power toggle	The available reactive power is an estimate of the reactive power that can be produced by the PV plant, taking into account the capabilities of the inverters and the current production.
5	Power factor inverter	The power factor can be found in the inverter documentation from the manufacturer and corresponds to the maximum adjustable value. You must only enter one value: overexcited or underexcited, e.g. 0.8.
6	Number of active inverters toggle	All inverters connected to a blue'Log which exceed a configured threshold of a delivered measured value. For master-slave setups, this includes all inverters connected to slave blue'Logs.
7	Selection of measurement value of the inverter	Select a relevant measured value, either AC power in kW or current in A. Note: not all inverters provide current AC as a measured value.
8	Configuration of the threshold	Define the minimum value in kW.

Slaves

The Slaves area shows all available devices that you can connect as slave devices.

Item	Name	Details
1	Green check mark	The slave is connected to this device
2	Chain icon	Connect device as a slave to this device
3	Yellow check mark	The slave is connected to another device
4	Arrow icon	Access the web interface for this slave device
5	Add device by IP	Manually add a device using its IP address

Master-slave mode

The blue'Log can be operated in three different modes:

Standalone: only one blue'Log is used for controlling your system
Master: several blue'Logs are required for large-scale control over your system, with the devices running in master-slave operation. The master blue'Log XC sends signals to a slave blue'Log XM.
Slave: A slave blue'Log XM receives signals from the master blue'Log XC.

For a master-slave mode, you need to determine whether your inverters are connected to a single blue'Log or multiple blue'Logs. For each grid connection point, only one master is allowed to be part of the control loop. All other blue'Logs must be operated in slave mode. The following graphic illustrates a typical scenario:

Standalone mode

Prerequisites

Your inverters are connected to a single blue'Log

Steps

Go to Power control > Operating data > Controller operation > activate the Standalone button.
A window appears asking if you want to change operating modes. Select OK.
Select Save.

Master mode

Prerequisites

Your inverters are connected to two or more blue'Logs
Firmware: master and slave must have the same firmware

Steps

Go to Power Control > Operating data > Controller operation > activate the Master toggle.
A window appears asking if you want to change operating modes. Select OK.
The blue'Log automatically searches for blue'Logs in the same network. These are displayed in the Slaves area.
In the Actions column, select the Link icon to indicate that the blue'Log is a slave. A green check mark will appear next to the blue'Log name. Alternatively, you can also select multiple slaves by checking the box and selecting Connect selected.

If slaves are not automatically found, check under System > Ethernet > Hostname that the Avahi toggle is activated.

If this does not work, go to Power Control > Operating data > Slaves. select Add device by IP. In the window that appears, enter the IP address and select OK.

Add device by IP without HEMS.png — Add device by IP

Slave mode

Prerequisites

A blue'Log XM or XC connected via ethernet to a blueLog XC
Firmware: master and slave must have the same firmware

For slave mode, the master device must first send a connection request. The name of the master blue'Log will appear under Power control > Operating data > Assigned master. If a device is operating in slave mode, the sidebar items Active power and Reactive power will be grayed out.

Further actions

Operate a blue'Log XM as a WEB'log slave

If you have a WEB'log as a master for power control, you do not need to use another WEB'log as a slave. Rather, you can configure a blue'Log as a slave for a WEB'log master. For this, you need the WEB'Log slave mode blue'Log XM license. See WEB'log slave mode data sheet.

bluelog as weblog slave_de.png — Operate a blue’Log XM as a WEB’Log slave