bluelog Neo
bluelog Neo
Breadcrumbs

Modbus Power Control interface

Last modified:

About the Modbus power control interface

The Modbus Power Control interface is an open Modbus TCP interface. It facilitates the real-time process data exchange with the grid operator. If telecontrol protocols (IEC 60870-5-101/-104, IEC 61850, or DNP3) are used, the interface serves as the ideal connection between a protocol converter (such as a programmable logic controller - PLC) and the telecontrol system of the grid operator.

For technical details and the complete read and write registers, see the Modbus power control license bluelog Neo data sheet.

You can activate a variety of features via Modbus and customize many different values, for example:

  • Active power limitation of the battery and PV system. See Grid operator commands.

  • Reactive power control setpoint.

  • Switching between different reactive power control methods.

  • Sending reference values, such as a voltage reference for a parallel shift of the characteristic curves.

  • Setting simulated frequency and voltage for testing purposes.

Configuration

Prerequisites

  • bluelog Neo with a PV, Battery, or Hybrid control license

  • Modbus power control license

Configuration example: Modbus power control interface

The configuration described below is an example. For the full range of options, refer to the register list.

  1. To configure active power (P), navigate to Power Control > Active power.

  2. Under Grid operator commands, select the check box for the Power limitation you want to configure. See also Grid operator commands.

  3. Under Interface, select Modbus.

  4. Select the unit, error behavior, and fallback value.

  5. To configure reactive power (Q), navigate to Power Control > Reactive power.

  6. Under Control mode, select the relevant Setpoint method command, typically Variable fixed value Qvar Modbus or Variable fixed value cos φvar Modbus.

Modbus power control is now configured.

Test the Modbus power control interface

You can use Modpoll to test the Modbus power control interface. For modpoll commands, refer to the example on the SCADA interface page.

To find the relevant Modbus IP address on the bluelog web interface, follow these steps:

  • For e.g. active power, go to Grid operator commands.

  • Select Transmission parameters Modbus TCP server.