Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Detlev Heinemann is active.

Publication


Featured researches published by Detlev Heinemann.


New Journal of Physics | 2016

Short term fluctuations of wind and solar power systems

Mehrnaz Anvari; G. Lohmann; Matthias Wächter; Patrick Milan; Elke Lorenz; Detlev Heinemann; M. Reza Rahimi Tabar; Joachim Peinke

Wind and solar power are known to be highly influenced by weather events and may ramp up or down abruptly. Such events in the power production influence not only the availability of energy, but also the stability of the entire power grid. By analysing significant amounts of data from several regions around the world with resolutions of seconds to minutes, we provide strong evidence that renewable wind and solar sources exhibit multiple types of variability and nonlinearity in the time scale of {it seconds} and characterise their stochastic properties. In contrast to previous findings, we show that only the jumpy characteristic of renewable sources decreases when increasing the spatial size over which the renewable energies are harvested. Otherwise, the strong non-Gaussian, intermittent behaviour in the cumulative power of the total field survives even for a country-wide distribution of the systems. The strong fluctuating behaviour of renewable wind and solar sources can be well characterised by Kolmogorov-like power spectra and


Journal of Physics: Conference Series | 2014

Large-eddy simulation of multiple wakes in offshore wind farms

Björn Witha; Gerald Steinfeld; Martin Dörenkämper; Detlev Heinemann

q-


Journal of Physics: Conference Series | 2014

Atmospheric Impacts on Power Curves of Multi-Megawatt Offshore Wind Turbines

Martin Dörenkämper; Jens Tambke; Gerald Steinfeld; Detlev Heinemann; Martin Kühn

exponential probability density functions. Using the estimated potential shape of power time series, we quantify the jumpy or diffusive dynamic of the power. Finally we propose a time delayed feedback technique as a control algorithm to suppress the observed short term non-Gaussian statistics in spatially strong correlated and intermittent renewable sources.


Journal of Wind Engineering and Industrial Aerodynamics | 2015

The impact of stable atmospheric boundary layers on wind-turbine wakes within offshore wind farms

Martin Dörenkämper; Björn Witha; Gerald Steinfeld; Detlev Heinemann; Martin Kühn

In this study, high-resolution large-eddy simulations of two German offshore wind farms are performed with the LES model PALM in which the turbines are parameterized with an actuator disk approach. The simulation of a single wind farm is realized by a stationary model domain with a turbulent inflow. Different atmospheric stratifications from slightly stable to unstable have been simulated and their effect on the wake characteristics is investigated. The results show a clear development of the flow within the wind farms with large differences between single, double and triple wakes. The wake deficit is increasing up to the second wake for the neutral and stable boundary layer and up to the third wake in the convective case before reaching a nearly constant value. This is explained with the turbulence intensity being much higher behind the second and subsequent turbines compared to the wake of the first turbine. With increasing atmospheric stability the wake deficits are shown to be stronger due to reduced turbulence.


European Physical Journal-special Topics | 2014

Kolmogorov spectrum of renewable wind and solar power fluctuations

M. Reza Rahimi Tabar; Mehrnaz Anvari; G. Lohmann; Detlev Heinemann; Matthias Wächter; Patrick Milan; Elke Lorenz; Joachim Peinke

Power curves for offshore wind turbines within the German offshore wind farm alpha ventus were derived based on the IEC standard. Binning in groups of shear and turbulence intensity as measures of atmospheric stability were performed. The derived power curves show a strong dependency on these two parameters. Differences of up to 15% in power output between unstable and stable stratification in the non-wake case occur. For wind turbines within the wake of others the effects are even more pronounced. Here, the differences in power production between the stability classes approach 20%. This dependency of the power curves on stability can cause significant miscalculations of instantaneous power production, long-term energy yield and loads. Parameters other than the hub height wind speed are often not taken into account in state-of-the-art wind power forecasts. This can lead to substantial over- or underestimation of the resulting power.


29th European Photovoltaic Solar Energy Conference and Exhibition | 2014

PV Power Predictions on Different Spatial and Temporal Scales Integrating PV Measurements, Satellite Data and Numerical Weather Predictions

Detlev Heinemann; O. Kramer; Annette Hammer; B. Wolff; Jan Kühnert; Elke Lorenz


Archive | 2010

Application of a large-eddy simulation model to the analysis of flow conditions in offshore wind farms

Gerald Steinfeld; Jens Tambke; Joachim Peinke; Detlev Heinemann


arXiv: Physics and Society | 2015

Suppressing the non-Gaussian statistics of Renewable Power from Wind and Solar

Mehrnaz Anvari; G. Lohmann; M. Reza Rahimi Tabar; Matthias Wächter; Patrick Milan; Detlev Heinemann; Joachim Peinke; Elke Lorenz


Archive | 2014

Large-eddy simulations of the internal boundary layer and wake flow within very large wind farms

Björn Witha; Gerald Steinfeld; Detlev Heinemann


Archive | 2012

Large number of offshore wind farms are likely to modify the characteristics of the wind field in the lower atmospheric boundary layer. The electricity generation of the nearby windfarms will be affected by strong wake interferences. As the number and the size of offshore wind farms in the North and Baltic Sea increases, these concerns deepen.

Detlev Heinemann; Siegfried Raasch; Abha Sood

Collaboration


Dive into the Detlev Heinemann's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Elke Lorenz

University of Oldenburg

View shared research outputs
Top Co-Authors

Avatar

G. Lohmann

University of Oldenburg

View shared research outputs
Top Co-Authors

Avatar

Jens Tambke

University of Oldenburg

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Martin Kühn

University of Stuttgart

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Jan Kühnert

University of Oldenburg

View shared research outputs
Researchain Logo
Decentralizing Knowledge