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
Europe’s Demographic Future. Where the Regions Are Heading after a Decade of Crises
10.08.2017 | Berlin-Institut für Bevölkerung und Entwicklung
Scientists reveal source of human heartbeat in 3-D
07.08.2017 | University of Manchester
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
Researchers from the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science, the Italian Space Agency (ASI), and the Instituto Geofisico--Escuela Politecnica Nacional (IGEPN) of Ecuador, showed an increasing volcanic danger on Cotopaxi in Ecuador using a powerful technique known as Interferometric Synthetic Aperture Radar (InSAR).
The Andes region in which Cotopaxi volcano is located is known to contain some of the world's most serious volcanic hazard. A mid- to large-size eruption has...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
16.08.2017 | Physics and Astronomy
16.08.2017 | Materials Sciences
16.08.2017 | Interdisciplinary Research