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Customer application

The Digital Energy Transition with High-Tech Controllers

The expansion of renewable energies can only succeed if the fluctuating supplies from solar and wind arrays are compensated by flexible electrical consumers and batteries. Digital technology can help to solve this problem: Intelligent systems convert the analog electrical network into a communicative smart grid and pave the way for linking virtual power plants, generators and consumers.

There are troubles ahead for wind energy. Although wind turbines are supposed to provide the lion’s share of the electrical supply in the long term, the federal government wants to put the brakes on new construction in northern Germany to a significant degree. Since 2017, Bremen, Hamburg, Schleswig-Holstein, Mecklenburg-Western Pomerania and the northern parts of Lower Saxony have only been permitted a maximum new wind output of 902 megawatts – this is not even 60 % of the output that is currently available. This is because the electrical lines in the stormy coastal regions have reached their capacity limits. Wind turbines are increasingly switched off as part of so-called supply management, because the large amounts of green energy could damage network stability.

The Energy Transition Goes Digital – Here’s How WAGO Supports You:

WAGO’s controllers ensure secure communication and control.
The new VHReady communication standard facilitates the interplay of decentralized systems.
Data encryption and specially secured connections defend against unauthorized access.

Stored Energy Counteracts Network Fluctuations

The difficult question is how to take the breaks off the energy transition. New electrical lines are supposed to transport the wind power from the coast of the North Sea to the south; however, the network expansion has been held up because laying the ground cables has taken longer than planned. Another challenge is gaining control over the weather-dependent, fluctuating green energy production. Solar arrays and wind farms already provide one-third of the electricity required in Germany – a proportion which is supposed to increase to 100 percent by 2050. According to experts, technical adaptations and new business models for marketing renewable energy are desperately needed. “We are relying on a type of generation that fluctuates, is decentralized and distributed and involves small producers This leads to new requirements on the infrastructure, the electrical grid, the control and the flexibility that used to be available in controllable power plants,” says Tobias Kurth from Energy Brainpool, energy marketing experts from Berlin.

The industry faces a mammoth task: It must develop solutions that retain stability in the electrical grid at a frequency of 50 Hz, even with increasing renewable energy production. Possibilities include batter storage units, as they can quickly accommodate excess current and discharge it again as needed. If they were installed, for example, at the base of large wind farms, then the stored energy could be used as balancing power to compensate for short-term fluctuations in the electrical grid. This would also avoid forced switch-off of wind turbines. The combination of batteries with photovoltaics is also logical. If solar batteries are coupled to charging stations, then EV charging stations can operate around the clock, providing solar energy to electric vehicles, or the batteries could also be used in the residential sector as storage systems. These could increase personal consumption and simultaneously cap the midday peaks from solar production that endanger the electrical grid.

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Heat and Fuel from Electricity

Power-to-heat and power-to-gas systems offer additional options for flexibility. They convert green energy into heat, using electric boilers, or into hydrogen and then methane through electrolysis. The heat can be supplied to a local district heating network; the gas can be stored for longer periods in the existing natural gas network that supplies residential areas, power plants and fuel stations. Thus, power-to-heat and power-to-gas both reduce the load on the electrical grid and also incorporate the heating and mobility sectors, which have previously played a subordinate role in the energy transition. “We could use northern Germany as a gigantic test lab for sector linkages. A few possibilities include: gas or heat generation using excess wind energy, local subsidy programs for heat pumps or e-vehicles and test routes for electric trucks or buses using overhead lines. This would also enable the quick expansion of the wind energy sector,” says Volker Quaschning, Professor in renewable energy technologies at the University of Applied Sciences Berlin.

However, the development of options for flexibility, such as batteries, is not the only challenge. Batteries must also be networked with the decentralized generators and consumers. The energy originates in a system built from thousands of producers, dominated by solar arrays and wind turbines, and flows in many combinations in several directions; it is comparable to data on the Internet. Therefore, intelligent, digital systems are necessary to measure the complex energy flows and to control and monitor the production systems according to the network situation. In addition, the systems must enable absolutely secure communication between the production level and the control technology; hacker attacks on power plants and the electrical grid are common and can endanger the supply network. “The digitization of the energy transition is the prerequisite for managing a decentralized energy market,” says Kurth.