To understand the nature of the wind resource; to learn how to conduct a site-specific analysis of the wind environment from measured data on the site in order to estimate the suitability of the site for wind turbine applications. Power curve, Wind Data, Capacity factor, Technology speed distribution
Task A: Wind speed distribution (annual). Plot the annual distribution of the wind speed magnitude in ms-1(i.e. plot the number of hours per year that the wind speed takes value within a certain range)(i) as this can be obtained from the measured data and (ii) as this can be derived using a long-term average value of annual mean wind speed for the site (obtained, for example, from publications/tables or the measurements) and Rayleigh distribution. Plot the results of Tasks A (i) and A (ii) on the same graph, explain, briefly, how the graphs are generated, critically evaluate your results, and compare the results of the distributions in A (i) and A (ii).Power curve, Wind Data, Capacity factor, Wind speed distribution
Task B: Wind turbine siting. You want to install a 50 kW wind turbine at your site and you are considering the one with the specifications given in the pdf file provided with this assignment. Discuss the suitability of this wind turbine for your site, based on the available wind resource at this site. Power curve, Wind Data, Capacity factor, Wind speed distribution
Solution Power curve, Wind Data, Capacity factor, Wind speed distribution
Task A (i)
Converting the speed of wind from knots to m/s
The conversion formula for converting knots to m/s is: 1 knot = 0.514 m/s
Frequency distribution of wind speeds.
The number of times each wind speed was observed is known as the frequency. The frequency distribution of wind speeds is a table or graph that shows how often each different wind speed occurs. A 25-bin frequency distribution is taken in our case.
The ‘FREQUENCY’ function in Excel is used to count how often values occur within a specific range of values.
To use the FREQUENCY function, the two arguments are used
· Data array: The range of cells that contains the data to be analyzed, here it is the wind speed data in m/s
· Bins array: The range of cells that contains the data that defines the intervals for the frequency distribution, here 25 bins are assumed.
renewable-energy-technology-wind-resourcesPowercurve,WindData
The Probability Density Function (PDF) is calculated by normalizing the frequency distribution to the total number of observations.
Annual Hours is calculated by finding the probability distribution, which is done by multiplying 1m/s interval with PDF and again multiplying it with the number of hours in a year i.e., 8760 hrs. Etc...
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