IEC 60870-5-104

The Bürgerwindpark Hohenlohe [a citizen owned wind farm] was founded in 1999 by the Niedernhall entrepreneur Friedrich Hertweck with the construction of one of the first wind turbines in the Heilbronn-Franken region. Today, in their second generation, 861 participating citizens operate 13 wind turbines at 7 locations. The largest project is the Bürgerwindpark (BWP) Weißbach.


Residents of the surrounding villages invest directly in their civil wind turbine systems and benefit from attractive and ecological returns for 20 years. This not only increases the acceptance of wind energy, but above all increases regionally added value. This means that revenues and profits from the generation of environmentally friendly wind power directly benefit the citizens involved in the vicinity of the wind farm.

Around 5% of the electricity demand in the district will be generated in the future by the civil energy project. Together with Bürgerwindpark Hohenlohe GmbH, Netze BW GmbH planned the electrical connection BWP Weißbach. By June 2016, five Vestas V126-3.3 wind turbines, each with a hub height of 137 m, a rotor diameter of 126 m and a rated output of 3,300 kW each, were able to commence operations. 240 citizens annually produce 34 million kWh of environmentally friendly wind power, enough for 9,500 households. Thus, BWP Weißbach is significantly advancing the energy transition in the Hohenlohe district.

Technical specifications

The power grid substation is, in compliance with all technical guidelines of Netze BW, equipped with the latest FW-50 telecontrol technology from SAE. This also includes the remote control by the system operator, in particular the set point specification of the reactive power and the control of the circuit breaker in critical network conditions. In addition, the FW-50 communicates with the VESTAS park controller via the IEC 60870-5-104 protocol in order to provide the system operator Netze BW with data necessary for operational management, such as active power, reactive power, air temperature, wind force, wind direction, etc. Specifically, the regulation or limitation of active power at the grid connection point and the regulation of voltage or reactive power at the grid connection point are thus fulfilled.

Protective devices and IT security

In addition, there is a Siemens protective device in the power grid substation, which automatically switches off the faulty network or the entire substation in the event of a malfunction. All relevant information is sent to the FW-50 directly from the protective device.
For reasons of IT security, communication from the telecontrol system to the Netze BW control system takes place via a protocol converter, which is linked to the prescribed IEC 60870-5-101 protocol via an RS-422 interface. SAE IT-systems created the configuration of this project in just a few steps with their powerful and very easy-to-use setIT parametrisation software. Thanks to successful cooperation with the company 3E-Technik, the wind farm was able to go into operation within a very short time.
SAE delivered, on time, a comparatively cost-effective complete solution for the BWP Weißbach renewable energy generation plant for its remote control, based on the technical requirements profile of Netze BW.