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Report 01
Introduktion til vindenergi (46000)
Danmarks Tekniske Universitet
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46000 Introduction to Wind Energy
Report 1
Analysis of measured wind data
Figure 1: The V52 turbine on a sunny day.
This report deals with analysis of wind data collected at Risø during your visit plus some refer- ence data.
Part 1: Vertical variation of wind speed
Describe the met mast and its location.
Describe the data collected. What has been measured, what units, what sample rate, where
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at the mast and with what instruments?
Plot the raw time series of the wind speed at the different heights. What time scales do you see? Do they differ for the different heights? Hint: check the support video on turbulent length scales before answering this question.
Plot the mean wind speed as function of height. Fit a logarithmic profile to the data. Assume neutral stability. Hint: before doing the fit, consider which should be the independent variable and which should be the dependent variable.
Calculate the turbulence intensity for each height. Plot as function of height and discuss the variation.
Three reference data sets for stable, neutral and unstable conditions are available at DTU Learn. Include these data sets in the plots of (4) and (5). Modify the plot, such that the ve- locities are normalized with the value in 44m height: v/v44. This makes the comparison of the profiles easier. Do the velocity profiles look as you expect? And the turbulence intensity profiles? Discuss. Next, with basis in the reference data, discuss if the conditions at the day of your measurements were stable, neutral or unstable. Hint: to answer this question, you may want to take into consideration the temperature measured by the two thermometers on the met mast.
How was the weather at the day of visit? Does the observed weather support your find- ing of question 6?
Part 2: Statistical analysis of 1-year wind climate
One year of observations of 10 minute mean values of wind data are provided in the file V52 Mast maalinger-2018 at DTU Learn. The second part of the report deals with data analysis of the annual wind climate variation.
Describe the data. What has been measured, in what units, at which locations, with which instruments and with what temporal resolution?
Plot the raw data as function of time.
Plot a wind rose and discuss the directional distribution of the wind.
Compute the ratio of the measured wind speeds for the two cup anemometers at 44m height (north divided by south). Plot as function of wind direction. Explain the results.
Define wind bins with a spacing of 1m/s and plot a histogram of the wind speed varia- tion based on the data from 70m height.
Fit a Weibull distribution to the observed wind speed. Plot together with the observed data. Make sure the histogram values are normalized correctly with bin width.
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Report 01
Kursus: Introduktion til vindenergi (46000)
Universitet: Danmarks Tekniske Universitet
