Nevertheless, experts are still deliberating which market model is best for transitioning to renewables.
However, one of the major technological challenges in this regard, namely balancing the fluctuations that are caused by wind and solar power, may soon be solved. The research project Kombikraftwerk 2 (Combined Power Plant 2) shows that a Germany-wide power grid could be stably operated even if it were fed only with electricity from renewable sources.
The project partners (which included Siemens' global research unit Corporate Technology) also demonstrated that solar, wind, and biogas power plants can contribute to system stability if they are connected with one another to form an intelligently controlled power plant.
In addition to wind, solar, biogas, and geothermal facilities, hydroelectric plants, pumped-storage electrical power stations and power-to-gas facilities also played a key role in the project scenario. Surplus electricity was used for the electrolytic generation of hydrogen, which was combined with CO2 that had been separated from the exhaust of fossil fuel power plants to form methane and then fed into the public gas network.
Gas-fired power plants used this methane to generate electricity whenever bottlenecks arose. On the basis of weather data and electricity consumption data, the simulations calculated the power output and the demand for every hour of the year in great detail and determined how electricity had to be transmitted in the grid.
Grid frequency and voltage must be kept stable in order to prevent power outages. As a result, power plants must provide a certain amount of reactive and controlling power. To maintain such power reserves in the scenario, the settings of the wind power rotors were adjusted to reduce output and the inverters that feed electricity into the grid were used to limit the power generation of the photovoltaic facilities. The simulations and the field test showed that a combined power plant consisting of renewables, gas turbines, and storage systems can provide the required level of output within seconds.
Experts at Siemens Corporate Technology made optimization calculations for the economical construction of electrolysis facilities and methane power plants. They also determined how much the grid would have to be expanded. Moreover, they calculated the power flows in the grid for every instant and every location, and they worked together with the University of Hanover to determine how much reactive and controlling power would be needed. In this way they showed in detail how system stability can be maintained at all times throughout the year.
Besides Siemens, the partners in the three-year Kombikraftwerk 2 research project were the German Meteorological Service, Enercon, the Fraunhofer Institute for Wind Energy and Energy System Technology (IWES), Ökobit, Leibniz University in Hanover, SMA Solar Technology, SolarWorld, and the German Renewable Energies Agency.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
Amputees can learn to control a robotic arm with their minds
28.11.2017 | University of Chicago Medical Center
The importance of biodiversity in forests could increase due to climate change
17.11.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
14.12.2017 | Health and Medicine
14.12.2017 | Physics and Astronomy
14.12.2017 | Life Sciences