Electricity by intermittent sources: An analysis based on the German situation 2012

Wagner, F.

doi:10.1140/epjp/i2014-14020-8

Cited by 42 publications

(55 citation statements)

References 6 publications

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“…The most obvious missing factor is the cost to realize this target value, namely the costs for investment on production and installation of solar PV and wind energy systems, and on the infrastructure to bring the produced energy to consumers. Regarding the latter factor of infrastructure, Wagner [18] pointed out that stresses on grids and the surplus power become very large and the capacity factor of back-up thermal power becomes very low once the contributions from intermittent sources, namely from solar PV and wind energies, exceed 40% of the total load. This is particularly severe for Japan, an island country isolated from the rest of the world with no grid connection to the outside, unlike European countries.…”

Section: ) Necessary Investments For Variable Sources Of Solar Pv Anmentioning

confidence: 99%

Energy situations in Japan before and after the Fukushima nuclear accident

Muraoka

2015

EPJ Web of Conferences

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Summary. -This article describes the various effects on the public conception on nuclear energy and more generally on energy policies in Japan due to the nuclear accident that occurred on 11th March 2011 at the Fukushima Dai-ichi nuclear power station, which is owned and operated by Tokyo Electric Power Company (TEPCO). Before the accident, nuclear energy had been conceived as the main energy source of electricity in Japan for reducing CO2 emission beyond 2020. However, public opinion has turned almost completely against nuclear energy after observing how vulnerable the nuclear system had been. The present Japanese government is now trying to buy time before taking a decision. After explaining these circumstances, the author tries to chart his personal projection of energy sources for Japan to 2050. -IntroductionThe Fukushima Dai-ichi nuclear accident has had deep and different impact on each individual not only in Japan but worldwide. The author wants to present his views on the impact in this article by the following structure: sect. 2 describes the Fukushima Dai-ichi nuclear accident, triggered by the earthquake and the subsequent tsunami on 11th March 2011, namely the accident itself, the number of casualties, the size of the affected areas, and the background leading to the accident by mainly referring to four reports (by the investigation committees of the National Diet

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Section: ) Necessary Investments For Variable Sources Of Solar Pv Anmentioning

confidence: 99%

Energy situations in Japan before and after the Fukushima nuclear accident

Muraoka

2015

EPJ Web of Conferences

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“…The data are schematic, as many influences [12] affect the detailed shapes of the curves without, however, changing their generic aspects. The intermittent nature [12,13] primary electricity from light and wind leads to a delivery curve inherently different from the load profile.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

“…The intermittent nature [12,13] primary electricity from light and wind leads to a delivery curve inherently different from the load profile. Highly undesirable are the steep maximum and the long tail structure.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

“…The dimension [12] of about 10% of the volumes shown in fig. 9(A) lets us expect that decades are required to develop the existing approaches into proven technologies with operational practice and reliable figures of merit.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%

“…In this way a portfolio of technology options can emerge that we may need to meet the specifically different challenges of energy systems. As example, the storage technologies in Germany [12] may be central, large and complex whereas the same purpose can only be met with simple and decentralized systems [32] in countries without a fully developed grid infrastructure.…”

Section: Lnes 2014mentioning

confidence: 99%

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Systemic aspects of the transition to sustainable energy

Schlögl

2015

EPJ Web of Conferences

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Summary. -The supply of free energy to our societies is today an intricate system comprising the regimes of technologies, regulatory frameworks, socio-economic impacts and techno-ecological interactions. As a consequence it is challenging to define clear directions or even device a master plan for the transformation of a single national energy system into a sustainable future. Even the term "sustainable" needs extensive discussion in this context that should not be defined solely in technological or ecological senses. The contribution illustrates some of the elements of the energy system and their interdependencies. It will become clear that multiple reasons exist to change the traditional generation and use of energy even when climate protection is not a sufficiently strong argument for a change.The desire to transform national energy systems into more sustainable forms is a growing global trend. The motivations behind this are, however, quite different. In Germany the dominant official driving force is the desire to contribute to climate protection. As the greenhouse gas emission (GHG) of Germany is limited (about 3%), the direct effect of national measures remains small. The German GHG emissions are of the same order of magnitude as the GHG emissions of single large industrial processes in the world

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The Dynamics of Electrons in Linear Plasma Devices and Its Impact on Plasma Surface Interaction

Hubeny

2019

Springer Theses

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Bibliografische Information der Deutschen Nationalbibliothek. Die Deutsche Nationalbibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie; detaillierte Bibliografische Daten sind im Internet über http://dnb.d-nb.de abrufbar. AbstractFor the viable operation of a thermonuclear fusion reactor, large pressure gradients are necessary in the edge of a magnetically confined plasma device. Turbulent cross-field transport across these gradients severely limits the durability of the current reactor designs by the erosion of plasma facing components. The convective character of this transport is caused by intermittently occurring plasma filaments, which are observed with similar characteristics in the edge of a wide range of plasma devices. Besides the ballistic plasma transport, filaments lead to pressure fluctuation statistics with a positive skewness and kurtosis, i.e. short, local spikes in density and temperature time traces. Erosion predictions based on time-averaged measurements underestimate dynamic effects on erosion mechanisms, e.g. the sputtering yield, due to its non-linear temperature dependence.The aim of this thesis was the development of a time-resolved laser Thomson scattering diagnostic system to investigate plasma dynamics leading to and during intermittent transport events, which were identified at the linear plasma generator PSI-2 in high powered, steady state Deuterium discharges with fast visual imaging. To retain the temporal information in the Thomson scattering setup, the signal was recorded in a triple grating spectrometer on a shot-to-shot basis with a photon counting method. The synchronization of the Nd:YAG laser and spectrometer to a fast framing camera allowed the novel usage of conditional averaging to create Thomson spectra. The selection of a subset of laser pulses with conditions in time and space was based on the plasma state characterized by 100 captured frames around each laser pulse with a time resolution of 3 µs.Time-averaged Thomson scattering profiles of plasma density and temperature were obtained for Deuterium, Helium, Neon and Argon discharges at different high power settings and a reasonable agreement was found with results from the Langmuir probe as the standard diagnostic tool at PSI-2. Standalone fast camera measurements were used to characterize the dynamics in the visible wavelength range and found distinct mode structures and slower oscillations with increasing ion mass. Two synchronized fast cameras showed that these mode are elongated along the magnetic field.The application of conditional averaging on Thomson scattering was successfully tested Argon discharges, where rotating brightness fluctuations with a 75 µs correlation time were found to correspond to a 20% temperature fluctuation amplitude around the temporal mean at the profile maxima. Subsequently, filaments in the edge of high power, low gas-feed Deuterium discharges were selected by conditional averaging and a significant temperature increase was found in the edge of Thomson scatterin...

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Electricity by intermittent sources: An analysis based on the German situation 2012

Cited by 42 publications

References 6 publications

Energy situations in Japan before and after the Fukushima nuclear accident

Energy situations in Japan before and after the Fukushima nuclear accident

Systemic aspects of the transition to sustainable energy

The Dynamics of Electrons in Linear Plasma Devices and Its Impact on Plasma Surface Interaction

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