Together with an international and interdisciplinary team, the scientist has therefore developed a prediction tool to help grid operators take the Braess paradox into account in their decisions. "Then you need an intuitive understanding of circular flows to be able to assess when the Braess paradox occurs and thus make the right decisions quickly," says Schäfer. However, when decisions have to be made at short notice, for example to shut down lines or shift power plant output, there is not always enough time to run through all scenarios. When building new lines and during operation, grid operators examine all possible scenarios. Most power grids have sufficient spare capacity to withstand the Braess paradox. Intuitive understanding enables fast decisions This makes the grid more unstable and, in the worst case, it collapses." "This becomes a problem when the most loaded line has to carry even more current, becomes overloaded, and eventually has to be shut down. "Due to conservation laws, this gives rise to a new circular flow, and more current then flows in some lines and less in others," Schäfer explains. The latter are crucial to understanding the Braess paradox: A power line is improved, for example, by reducing its resistance, and can then carry more current. In an experimental setup in the laboratory showing the Braess paradox in an AC grid, the researchers observed the phenomenon in simulation and in experiment, placing special emphasis on circular flows. They simulated the German power grid, including planned reinforcements and expansions. Schäfer now have simulated the phenomenon in detail for power grids for the first time and demonstrated it on a larger scale. Researchers simulate German power grid including planned expansions For power grids, it has so far only been predicted theoretically and illustrated on a very small scale. This effect has been observed in traffic systems and been discussed for biological systems. The phenomenon is named after the German mathematician Dietrich Braess, who first discussed it for road networks: Under certain conditions, the construction of a new road can increase the travel time for all road users. Benjamin Schäfer, head of the Data-driven Analysis of Complex Systems (DRACOS) research group at the KIT Institute for Automation and Applied Informatics. This phenomenon states that an additional option leads to a worsening of the overall situation instead of to an improvement," says Dr. However, by upgrading existing lines or adding new ones, the grid may become more unstable rather than more stable, which results in power outages. Such expansion calls for large investments and aims to make the grids more stable. The sustainable transformation of the energy system requires an expansion of the grids to integrate renewable sources and transport electricity over long distances. The researchers report in the journal Nature Communications.
For the first time, an international team, including researchers from the Karlsruhe Institute of Technology (KIT), has now simulated this phenomenon in detail for power grids, demonstrated it on a larger scale, and developed a prediction tool, which is to support grid operators in decision-making.
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