Estimation of the influences of spatiotemporal variations in air density on wind energy assessment in China based on deep neural network

Energy ◽  
2021 ◽  
pp. 122210
Author(s):  
Yushi Liang ◽  
Chunbing Wu ◽  
Xiaodong Ji ◽  
Mulan Zhang ◽  
Yiran Li ◽  
...  
2020 ◽  
Vol 2020 ◽  
pp. 1-22
Author(s):  
Adel Ab-BelKhair ◽  
Javad Rahebi ◽  
Abdulbaset Abdulhamed Mohamed Nureddin

Presently, climate change and global warming are the most uncontrolled global challenges due to the extensive fossil fuel usage for power generation and transportation. Nowadays, most of the developed countries are concentrating on developing alternative resources; consequently, they did huge investments in research and development. In general, alternative energy resources including hydropower, solar power, and wind energy are not harmful to nature. Today, solar power and wind power are very popular alternative energy sources due to their enormous availability in nature. In this paper, the photovoltaic cell and wind energy systems are investigated under various weather conditions. Based on the findings, we developed an advanced intelligent controller system that tracks the maximum power point. The MPPT controller is a must for the renewable energy sources due to unpredictable weather conditions. The main objective of this paper is to propose a new algorithm that is based on deep neural network (DNN) and maximum power point tracking (MPPT), which was simulated in a MATLAB environment for photovoltaic (PV) and wind-based power generation systems. The development of an advanced DNN controller that improves the power quality and reduces THD value for the microgrid integration of hybrid PV/wind energy system was performed. The MATLAB simulation tool has been used to develop the proposed system and tested its performance in different operating situations. Finally, we analyzed the simulation results applying the IEEE 1547 standard.


2020 ◽  
Vol 224 ◽  
pp. 113371
Author(s):  
Yushi Liang ◽  
Xiaodong Ji ◽  
Chunbing Wu ◽  
Jianjun He ◽  
Zhiheng Qin

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2635 ◽  
Author(s):  
Alain Ulazia ◽  
Ander Nafarrate ◽  
Gabriel Ibarra-Berastegi ◽  
Jon Sáenz ◽  
Sheila Carreno-Madinabeitia

Hywind-Scotland is a wind farm in Scotland that for many reasons is at the leading edge of technology and is located at a paradigmatic study area for offshore wind energy assessment. The objective of this paper is to compute the Capacity Factor ( C F ) changes and instantaneous power generation changes due to seasonal and hourly fluctuations in air density. For that reason, the novel ERA5 reanalysis is used as a source of temperature, pressure, and wind speed data. Seasonal results for winter show that C F values increase by 3% due to low temperatures and denser air, with economical profit consequences of tens of thousands (US$). Hourly results show variations of 7% in air density and of 26% in power generation via FAST simulations, emphasizing the need to include air density in short-term wind energy studying.


Energy ◽  
2019 ◽  
Vol 171 ◽  
pp. 385-392 ◽  
Author(s):  
Christopher Jung ◽  
Dirk Schindler

Author(s):  
David T. Wang ◽  
Brady Williamson ◽  
Thomas Eluvathingal ◽  
Bruce Mahoney ◽  
Jennifer Scheler

Author(s):  
P.L. Nikolaev

This article deals with method of binary classification of images with small text on them Classification is based on the fact that the text can have 2 directions – it can be positioned horizontally and read from left to right or it can be turned 180 degrees so the image must be rotated to read the sign. This type of text can be found on the covers of a variety of books, so in case of recognizing the covers, it is necessary first to determine the direction of the text before we will directly recognize it. The article suggests the development of a deep neural network for determination of the text position in the context of book covers recognizing. The results of training and testing of a convolutional neural network on synthetic data as well as the examples of the network functioning on the real data are presented.


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