نتایج جستجو برای: mean wind speed

تعداد نتایج: 846128  

Journal: :international journal of environmental research 2014
a. gupta r. vijay v.k. kushwaha s.r. wate a. shiehbeigi

numerous studies yet have been carried out on downscaling of the large-scale climate data usingboth dynamical and statistical methods to investigate the hydrological and meteorological impacts of climatechange on different parts of the world. this study was also conducted to investigate the capability of feedforwardneural network with error back-propagation algorithm to downscale the provincial...

2013
Achim Strunk Joris Brombach Jon Meis Frank Sehnke Martin Felder Anton Kaifel

A novel implementation of neural networks for a measure-correlate-predict (MCP) technique is being introduced. This approach represents a state-of-the-art machine learning procedure making use of sophisticated methods to limit generalisation errors. Moreover, the implementation is fully tailored to the requirements of MCP methods in the context of wind resource assessment. We show the applicati...

Journal: :CoRR 2017
Jianan Cao David J. Farnham Upmanu Lall

The prediction of near surface wind speed is becoming increasingly vital for the operation of electrical energy grids as the capacity of installed wind power grows. The majority of predictive wind speed modeling has focused on point-based time-series forecasting. Effectively balancing demand and supply in the presence of distributed wind turbine electricity generation, however, requires the pre...

2014
Sruthi V. Nair Poonam Kothari Kushal Lodha

Careful planning of the electrical power sector is of great importance since the decisions to be taken involves the commitment of large resources, with potentially serious economic risks for the electrical utility and the economy as a whole. There are different types of techniques available for analysis and prediction of randomly varying parameters. They are classified as statistical, intellige...

2013
Atsushi Yona Tomonobu Senjyu Funabashi Toshihisa Chul-Hwan Kim

In recent years, there has been introduction of alternative energy sources such as wind energy. However, wind speed is not constant and wind power output is proportional to the cube of the wind speed. In order to control the power output for wind power generators as accurately as possible, a method of wind speed estimation is required. In this paper, a technique considers that wind speed in the...

Ali Akhavein, Mahmoud Reza Haghifam Shohreh Monshizadeh,

A wind farm is a collection of wind turbines built in an area to provide electricity. Wind power is a renewable energy resource and an alternative to non-renewable fossil fuels. In this paper impact of wind farms in power system reliability is investigate and a new procedure for reliability assessment of wind farms in HL1 level is proposed. In proposed procedure, application of Fuzzy – Markov f...

2016
Julio J Melero

The probabilistic approach has an important place in the wind energy research field as it provides cheap and fast initial information for experts with the help of simulations and estimations. Wind energy experts have been using the Weibull distribution for wind speed data for many years. Nevertheless, there exist cases, where the Weibull distribution is inappropriate with data presenting bimoda...

Journal: :ماشین های کشاورزی 0
مهرداد جلالوند حسین باخدا مرتضی الماسی

in order to restrain the potential of wind energy, the first step is to determine the wind energy potential. in this study the wind data was used from the three-hour frequency recording of 10-year period (2002-2011). to predict the occurrence probability of each wind speed, the two-parameter weibull function was used. the goodness of fit test by chi-square test showed that the wind speed distri...

2011
Torben Knudsen Thomas Bak Mohsen Soltani M. Soltani

In wind farms, individual turbines disturb the wind field by generating wakes that influence other turbines in the farm. From a control point of view, there is an interest in dynamic optimization of the balance between fatigue and production, and an understanding of the relationship between turbines manifested through the wind field is hence required. This paper develops models for this relatio...

Introduction: Climatic components are the vital factors influencing the dust event. It was believed that changes in climate parameters play a crucial role in the occurrence of dust events. Former studies have shown that temperature, rainfall, and wind speed contribute to poor vegetation, providing requirements of dust events. Long-term dust data indicated that climate has a profound effect on d...

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