**2. Previous investigations on wind prediction**

There are some studies reported in the literature about wind speed in future periods which some of them are summarized in Table 1.



**Table 1.** Wind speed investigations in future period

electricity. The evidence shows that in some countries such as Iran, Iraq, Egypt, China, Italy, Spain, the wind energy has been used for milling and irrigation. According to IPCC special report on renewable energy sources and decreasing the climate change damages, there is an increasing trend in the magnitude of the wind power plants from 17 meters high and 75 kilowatts in 1980 decade to 80 meters high and 1800 kilowatts in 2005-2010. It is predicted that the size of these generators should be 250 meters high and 20000 kilowatts in future years which is clarifying the increasing trend of application of this green energy. An important challenge in front of this kind of power plants is the uncertainty in accessible capacity of electrical power. This problem has been caused by random nature of effective factors such as random variation in mechanical forces generating wind power. In other words, due to the continuous variations in meteorological and climatological conditions, the wind speed, duration, density and power are randomly changing. Thus, for using its power, it is necessary to study the windy conditions in the area and statistical data reported by meteorology centers. However, the analysis of such large amount of data recorded in meteorology centers to estimate the mechanical power input of wind power plants is not possible except using some applied methods. Obviously, the study of the behavior and speed of winds will lead to more accurate estimation of accessible capacity in wind power plants. Moreover, spatial analysis of this climatological phenomenon will provide some essential knowledge about the areas with potential capacity of constructing wind power plants. The frequency analysis is an operative tool in assessing this aim. This study is going to describe these materials and their effects on

There are some studies reported in the literature about wind speed in future periods which

Dynamical Downscaling Case study German 2 scenarios ECHAM Hoyme and Zieleke

Case study USA 2 scenarios

**Results Paper Type Location Scenarios Model References**

Historical wind time series for future application Harmsen et al. (2009) Historical wind time series for future application Doria et al. (2006)

Case Study Nebraska 2 scenarios MPI Bogardi and

HADCM2, CGCM1

Matyasovszky (1996)

(2001)

Breslow and Sailor (2002)

regionalization of wind speed under effect of climate change.

**2. Previous investigations on wind prediction**

some of them are summarized in Table 1.

Wind speed change is stronger than the changes obtained for the same region on daily precipitation and

216 New Developments in Renewable Energy

The GCM models of climate change become more reliable and as tools are refined for improving results at regional scales, it will be desirable to

temperature
