Vindkraftsetablering i skog

Sammanfattning

This thesis assignment at C-level is focused on calculation models and prediction methods

whish can be used in the stage we call ”prospecting” of possible windmill locations. The

location is southeast of Halmstad at the Farm ”Stjernarpsgods”. The rapport has two main

areas directed towards this task. The areas are a study of literature and a description of

methods used in the project. The ”prospect” project description is aimed towards calculations

of the energy carried by the wind and transformed to electricity by windmills.

With a relatively simple algorithm of mean wind speed data from the MIUU - model, Cp and

rotor area from a turbine with 90 m diameter, the calculated production is 6 638 MWh. When

the same mean wind speed is used in the second type of calculation, Weibull distribution

(with a calculated A and the form value c set to 2) and the power curve for Vestas V90 taken

from WindPro, the production was 6 873 MWh. The third alternative uses collected data from

a local mast at a distance of 18km´s from the site. This data is normalized and used to

calculate with Weibull distribution the production to 7 443 MWh. Finally a reference

calculation is done using WindPro and the official SMHI wind data from Halmstad and

Ringhals. In this case the production was calculated to 5 725 MWh. The difference is a 30

procent increase from the lowest to the highest production value. Comparing calculations at

different heights shows that the difference in result is very small at a height of 50 meters, but

increase with increasing height.

The Pay-off time was calculated with 3 different energy prediction models. The result was

Pay-off times off 7, 5 ” 9 ” 11, 4 years, with the price of electricity at 0, 60 Sek/kWh.

The environmental consequence analysis which is presented in appendix 1 is mainly focused

on landscape impact, whish in this case means, that the windmills are clearly visible from

west and southwest.

The conclusion is that the value of wind measurements and understanding of sources of error

is important, and that no investment should be done without proper wind measurements on

site.