A5064407348- Wind Energy Research and Development
- Wind and Air Flow Studies
- Meteorological Phenomena and Simulations
- Remote Sensing and LiDAR Applications
- Energy Load and Power Forecasting
- Ocean Waves and Remote Sensing
- Structural Health Monitoring Techniques
- Climate variability and models
- Advanced Optical Sensing Technologies
- Atmospheric aerosols and clouds
- Icing and De-icing Technologies
- Aeolian processes and effects
- Fluid Dynamics and Turbulent Flows
- Machine Fault Diagnosis Techniques
- Plant Water Relations and Carbon Dynamics
- Oceanographic and Atmospheric Processes
- Fluid Dynamics and Vibration Analysis
- Scientific Research and Discoveries
- Underwater Acoustics Research
- Advanced Thermodynamics and Statistical Mechanics
- Ocular and Laser Science Research
- Magnetic Bearings and Levitation Dynamics
- Oil Spill Detection and Mitigation
- Solar Radiation and Photovoltaics
- Cryospheric studies and observations
Fraunhofer Institute for Wind Energy Systems
2014-2024
Roskilde University
2012
Carl von Ossietzky Universität Oldenburg
2006-2009
Abstract. This is the second of two papers that document creation New European Wind Atlas (NEWA). In Part 1, we described sensitivity experiments and accompanying evaluation done to arrive at final mesoscale model setup used produce wind atlas. this paper, 2, how made atlas product, covering both production climatology generated with Weather Research Forecasting (WRF) microscale Analysis Applications Program (WAsP). The paper includes a detailed description technical practical aspects went...
Abstract Modeling of the systematic errors in second-order moments wind speeds measured by continuous-wave (ZephIR) and pulsed (WindCube) lidars is presented. These use conical scanning technique to measure velocity field. The model captures effect volume illumination scanning. predictions are compared with measurements from ZephIR, WindCube, sonic anemometers at a flat terrain test site under different atmospheric stability conditions. used several heights on meteorological mast combination...
ABSTRACT The current IEC standard for wind turbine power performance measurement only requires of the speed at hub height assuming this to be representative whole rotor swept area. However, output a depends on kinetic energy flux, which itself profile, especially large turbines. Therefore, it is important characterize profile in front turbine, and should preferably achieved by measuring over vertical range between lower higher tips. In paper, we describe an experiment profiles were measured...
The New European Wind Atlas project will create a freely accessible wind atlas covering Europe and Turkey, develop the model chain to perform series of experiments on flow in many different kinds complex terrain validate models. This paper describes which some are nearly completed while others planning stage. All focus properties that relevant for turbines, so main is mean turbulence at heights between 40 300 m. Also extreme winds, shear veer, diurnal seasonal variations interest. Common all...
Floating lidar was introduced in 2009 as an offshore wind measurement technology focusing on the specific needs of industry with regard to resource assessment applications. systems ( FLS ) are meant replace met mast, being significantly cheaper and saving essential part project upfront investment costs. But at same time, they need overcome particular challenges—these (1) movement sea imparting motion buoy lidar, subsequent challenge maintaining speed direction accuracy, (2) remoteness...
This review article aims to provide an overview and insight into the most relevant aspects of wind energy development current state-of-the-art. The industry is in a very mature stage, so it seems be right time take stock areas use for power generation. For this review, authors considered essential technology: research, modeling, prediction speed as source, technology plants divided mechanical electrical systems plant control, finally optimal operation including maintenance strategies. focus...
We introduce a dynamical approach for the determination of power curves wind turbines and compare it with two common methods—among them standard procedure due to IEC 61400-12-1, i.e. international prepared published by International Electrotechnical Commission. The main idea new method is separate dynamics turbine's output into deterministic stochastic part, corresponding actual behaviour turbine external influences such as turbulence wind, respectively. In particular, governing coefficients...
ABSTRACT The need for measuring wind speed and direction at greater heights several levels simultaneously gains importance as turbines become larger higher. For this purpose, remote‐sensing profilers very attractive resource assessment power performance testing. However, the existing standards only permit use of cup anemometers standard instruments. main issue preventing remote sensors in such is to maintain traceability measurements international system. In paper, we describe a verification...
Wind measurements using classical profiling lidars suffer from systematic measurement errors in complex terrain. Moreover, their ability to measure turbulence quantities is unsatisfactory for wind-energy applications. This paper presents results a campaign during which multiple WindScanners were focused on one point next reference mast multi-lidar (ML) technique also compared lidar the Doppler beam swinging (DBS) method. First- and second-order statistics of radial wind velocities individual...
In this contribution we introduce the Fraunhofer IWES Wind Lidar Buoy, a floating-lidar prototype comprising proven marine buoy design and pulsed lidar device integrated in it. A software correction algorithm was developed to remove effects of sea conditions resulting system motions from recorded data. The final performance verified measurement campaign next offshore meteorological mast FINO1 German North Sea. Both results an accuracy assessment more detailed sensitivity analysis with...
IEA Wind Task 32 exists to identify and mitigate barriers the adoption of lidar for wind energy applications. It leverages ongoing international research development activities in academia industry investigate site assessment, power performance testing, controls loads, complex flows. Since its initiation 2011, has been responsible several recommended practices expert reports that have contributed ground-based, nacelle-based, floating by industry. Future challenges include uncertainty models,...
A previously devised approach for the reconstruction of Langevin processes from given data is revised with respect to disturbances stemming finite sampling rates and presence external measurement noise. For these two cases a combination both three different estimates drift diffusion functions are introduced, an optimization procedure presented that allows intrinsic estimates. Special attention paid deterministic fixed points defining characteristic behaviour process, its robustness against...
As wind is the basis of all energy projects, a precise knowledge about its availability needed. For an analysis site-specific conditions, Virtual Meteorological Masts (VMMs) are frequently used. VMMs make use site calibrated numerical data to provide estimates during phases project. Typically, used for long-term correlation that required estimating yield new farm projects. However, can also be fill gaps or operational phase as additional reference set detect degrading sensors. The value VMM...
Abstract. Inflow wind field measurements from nacelle-based lidar systems offer great potential for different applications including turbine control, load validation, and power performance measurements. On floating turbines are affected by the dynamic behavior of foundations. Therefore, effects on speed induced floater dynamics must be understood. In this work, we investigate influence motions forward-looking mounted offshore (FOWTs) suggest approaches correcting motion-induced effects. We...
Abstract. Accurate wind speed determination at the height of rotor swept area is critical for resource assessments. ERA5 data combined with short-term measurements through “measure, correlate, predict” (MCP) method are commonly used offshore applications in this context. However, poses limitations capturing site-specific variability due to its low resolution. To address this, we developed random forest models extending near-surface up 200 m, focusing on Dutch part North Sea. Based public...
Abstract. In contrast to fixed measuring devices, ship-based lidar systems provide highly reliable wind observations within extensive regions. Therefore, this kind of reference dataset provides a great potential for evaluating the performance mesoscale numerical models in resembling flow phenomena such as low-level jets – essential an optimal development and operation turbines. This paper presents comparison between output data from two state-of-the-art datasets (ERA5 NEWA) ship-mounted...
The American WAKE ExperimeNt (AWAKEN) is a multi-institutional field campaign focused on gathering critical observations of wind farm–atmosphere interactions. These interactions are responsible for large portion the uncertainty in plant modeling tools that used to represent performance both prior construction and during operation can negatively impact energy profitability. AWAKEN will provide data validation, ultimately improving lowering these uncertainties. designed address seven testable...
Abstract. Floating Lidar Systems (FLS) play a crucial role in offshore wind resource assessment, offering cost-effective and flexible alternative to traditional meteorological masts. While speed direction measurements from FLS demonstrate high accuracy without further in-depth correction required, platform motions introduce systematic overestimation of turbulence intensity (TI). This motion-induced bias requires compensation techniques ensure reliable TI measurements. study evaluates the...
Abstract Scanning lidars are increasingly favored for wake measurements because of their ability to scan over and therewith assess the effects single wind turbines greater parts farms. While these often studied only qualitatively, this study quantitatively evaluates accuracy scanning lidar in an offshore campaign that involved three long-range installed on turbine nacelles farm-scale measurements. We investigated from two positioned at front back farm during a westerly case study. The data...
A frequent challenge for wind energy applications is to grasp the impacts of turbulent fields properly. The turbine power performance curve, usually determined applying IEC standard 61400-12, provides a functional relation between measured speed u and corresponding output P turbine. But it not sufficient describe actual dynamics on small time scales. Recently, we introduced an alternative method estimate curve based high-frequency data. crucial point this that first reconstruct turbine's...
Measuring wind offshore in deep water depths will be a future challenge. Where the sea bed foundation installation for fixed meteorological masts is impossible, floating systems tend to sophisticated solution. In addition use of moored lidar- buoy systems, ship-lidar are an alternative solution number different applications. this paper we describe general aspects motion influences on lidar measurements as well two motion-correction methods motion-influenced measurements. The implementation...
Offshore resource assessment with lidars on floating platforms is a flexible and particularly cost-effective alternative to the conventional meteorological mast solution, that considered as onshore state-of-the-art transferred offshore sites, may enable better more complete wind assessments for growing sector. Wind lidar technology, remote sensing in general, has already been proven be very promising technology power performance testing onshore. For applications particular, motions from base...
This article presents the Ferry Lidar Experiment, which is one of NEWA Experiments, a set unique flow experiments conducted as part New European Wind Atlas (NEWA) project. These have been prepared and to create adequate datasets for mesoscale microscale model validation. For Experiment Doppler lidar instrument was placed on ferry connecting Kiel Klaipeda in Southern Baltic Sea from February June 2017. A comprehensive all relevant motions recorded together with data processed order obtain...
As a part of the New European Wind Atlas project, we investigate estimation extreme winds from mesoscale simulations. In order to take smoothing effect simulations into account, spectral correction method is applied data. We show that corrected wind estimates are close values obtained offshore met masts. Hence, after further investigations plan use examined approach as basis for calculation on complete Atlas, which will be publicly available at end project.