Influence Of The Methods Of Estimation Of The
Wind Velocity Distribution Parameters On The
Accuracy Of Wind Energy Calculations
Author(s)
T. Niedoba & B. Soliński
Abstract
Many parameters influence wind energy resources, as well as the amount of
energy that can be produced by wind power plants. They are connected with
wind and climatic conditions, the location of the power plant, as well as those
associated with the power plant itself.
The basic parameter of wind energy is the velocity of flowing air, whose
variation is very high. As a result, permanent changes in power and wind energy
amounts occur, which was shown in the paper on the basis of selected locations
in Poland and Netherlands.
The methodology of \“Wind Atlas”, elaborated by RISO in 1989 and being
currently the world standard, is used to evaluate wind energy resources. In this
methodology, the Weibull distribution function is applied to describe the
distribution of wind velocity, whose parameters are calculated on the basis of
empiric data, with the moments method as the method of approximation. This is,
however, a possible source of errors, which are then included in the produced
amount of energy. It is crucial, then, to apply the proper approximation methods
and to know the possible occurring errors.
The measurement of the wind velocity should be very precise, because even a
small error like 5% in evaluation of wind velocity produces about a 16%
miscalculation in the forecasting of the total amount of energy produced.
Three methods of Weibull distribution function approximation for wind
velocity were presented in the paper: the least square method, the maximum
likelihood method and the moments method. The given results were verified and
Keywords
wind velocity, Weibull distribution function, approximation methods, wind energy
Related Book
Other papers in this volume
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