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wind-power
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Total 222 records
Optimizing Transmisson from Distant Wind Farms
, M.Sc. Thesis Sharif University of Technology ; Hosseini, Hamid (Supervisor)
Abstract
Wind power is site dependent and is by nature partially dispatchable. Furthermore, good wind sites are far from grid. Due to these problems, and along with the existing limitations in the transmission networks, a comprehensive analysis over an extended time is needed to properly explore all potential wind sites for wind capacity allocation. This problem is computationally expensive and decomposition methods are required to break down this problem. Here Benders decomposition approach is used, which is a popular technique for solving large-scale problems, to decompose the original problem into a master and a subproblem. The master problem is a linear problem, which allocates wind capacity to...
Planning of Energy Storage Systems with the Main Goal of Managing the Output Power of Wind Farms
, M.Sc. Thesis Sharif University of Technology ; Ehsan , Mehdi (Supervisor)
Abstract
Uncertain fuel prices and also global climate changes are accompanied by some state initiatives such as renewable portfolio standards (RPS). This has caused a fast growth in the amount of renewable energy installed worldwide especially wind energy over last decades. However, the intrinsic characteristics of wind farms output power, i.e. intermittency and volatility of wind speed along with being non-dispatchable in output generation of wind turbine raises many new technical and financial challenges for power system operators and planners. Up to these issues, large level of wind power penetration causes a growing concern in wind energy curtailment issue which the wind farm’s operator may be...
Planning of Energy Storage Systems in the Restructured Environment by Considering Uncertainties
, M.Sc. Thesis Sharif University of Technology ; Ehsan, Mahdi (Supervisor)
Abstract
Energy storage is a pivotal technology to dealing with increasing demand for reliability and challenges of renewable energy integration. This thesis provides a benders decomposition framework for expansion studies of energy storage systems (ESSs) in high wind penetrated power system and uncertainties of wind farms expansion and wind speed. This work proposes probabilistic and robust approaches to determine the optimal location and size of storage devices to reduse wind curtailment. The proposed methodologies are implemented on the modified IEEE 73-bus test system and their anticipated applicability are compared to each other and well verified
Analysis and Performance Evaluation of Manjil Wind Farm
, M.Sc. Thesis Sharif University of Technology ; Parniani, Mostafa (Supervisor)
Abstract
This project aims to evaluate the performance of turbine generators of various kinds that are used in Manjil wind farm, based on the measured results over a period of operation and comparing them with simulation results of the same turbine generators. It also contains a comparative study with newer types of variable speed. The results of this study can be useful to examine the actual results of operation and design characteristics of the existing turbine, and also the possible advantages of using variable speed wind turbines at Manjil wind farm. Other goal of this project is to evaluate the performance of wind farm thorough turbines’ simulation results and measured result of plant’s fiders...
Economical Model Analysis for Khaf Wind Farm Considering Reliability
, M.Sc. Thesis Sharif University of Technology ; Oraee Mirzamani, Hashem (Supervisor)
Abstract
Wind has been shown to be one of the fastest growing sources of energy among renewable energy resources during recent decades. Widespread utilization of wind power during recent years imposes considerable effects on modern power systems in which the renewable energy supplies are included. Also power systems reliability evaluations have received significant attentions during recent years so studying wind farm's reliability would be of great importance in modern power systems whether it is studied as a part of the power grid or as an isolated system.In addition, the competitive environment of the power markets thrusts the power suppliers to follow the most economical patterns of operation,...
Coordinated Strategy of Price-maker Renewable Generation and Thermal Units in Elrctricity Market
, M.Sc. Thesis Sharif University of Technology ; Ranjbar, Ali Mohammad (Supervisor)
Abstract
Wind energy, as a type of renewable energy resource, is clean and is rapidly growing globally. The intermittency in the production of wind energy is the most major obstacle for these producers in a competitive electricity market, to compete with thermal units. Most existing models in the literature mitigate the risk of wind power, by coordinating them with energy storages such as pumped storages power plant. Here, in this thesis, another risk mitigation approach is introduced which combines wind energy and natural gas power plant in an electricity market. In addition, as the penetration level of wind power grows, the wind power producers must be considered as a price-maker player which their...
Reliability Assessment of Wind Power Density in Khouzestan Province
, M.Sc. Thesis Sharif University of Technology ; Moghim, Sanaz (Supervisor)
Abstract
This study seeks to evaluate reliability of wind power density over Khouzestan province using WRF simulations. Based on 10 meter wind speed data extracted from eight synoptic stations over Khouzestan province, two different domains were selected in south and south-west of khouzestan as promising regions with strong wind speeds. WRF model were used to simulate atmospheric data during 2016 and over two selected regions with 2 kilometers grid spacing. Simulated data were verified with comparing to in-situ data via three parameters of RMSE, BIAS and correlation. Results indicate that model configuration had acceptable accuracy in simulating wind speed data. In this study, Monte Carlo...
Evaluating Capacity Value of Wind Power Plants Considering Storage Systems
, M.Sc. Thesis Sharif University of Technology ; Fotuhi Firuzabad, Mahmud (Supervisor) ; Safdarian, Amir (Co-Supervisor)
Abstract
In recent decades, the trend towards renewable energy sources has increased dramatically. Rising fossil fuel prices and concerns about the effects of greenhouse gases and carbon dioxide emissions have drawn the attention of many energy experts to the use of renewable energy sources such as wind farms as an alternative to fossil fuel energy sources. Therefore, the issue of reliability related to these sources and whether such units can be considered as a source of generation has gained more importance. Due to the random nature of wind power, the share of these power plants in providing system adequacy is less than their nominal value. Therefore, determining the capacity value of wind power...
Wind turbine productivity considering electrical subassembly reliability
, Article Renewable Energy ; Volume 35, Issue 1 , 2010 , Pages 190-197 ; 09601481 (ISSN) ; Oraee, H ; Tavner, P.J ; Sharif University of Technology
2010
Abstract
This paper proposes a reliability model for the electrical subassemblies of geared wind turbine systems with induction generators. The model is derived considering the failure of main subassemblies and their parameters are calculated. A productivity comparison is performed between the selected wind turbine systems including reliability issues. Two methods of modification for variable-speed wind turbines with Doubly Fed Induction Generators (DFIG) to improve their availability are finally suggested
Wind turbine power improvement utilizing passive flow control with microtab
, Article Energy ; Volume 150 , 2018 , Pages 575-582 ; 03605442 (ISSN) ; Movahhedi, M ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
In this study, the effect of deploying microtabs on performance improvement of a horizontal axis wind turbine blade is numerically investigated in three-dimensions. The NREL Phase VI, a stall-regulated upwind wind turbine, is used as the baseline case. Different cases are considered to investigate the effects of spanwise location as well as the height variation of tabs along the blade span, on the flow over the rotor blade. In all cases, the tab is located at 95% chord of the airfoil section on the lower surface of the blade. Results reveal that locating microtabs at the outboard part of the blade has a greater impact on the rotor performance than the inboard part. However, both cases...
Wind power in Iran: technical, policy, and financial aspects for better energy resource management
, Article Energies ; Volume 15, Issue 9 , 2022 ; 19961073 (ISSN) ; Mohseni Cheraghlou, A ; Sharif University of Technology
MDPI
2022
Abstract
Iran is situated in a wind belt. However, the installed wind capacity in Iran is around 300 MW, which is minuscule compared with the global 651 GW capacity as of 2021. Using novel data from wind trackers across Iran, the paper’s findings show immense potential for wind energy in Iran from a technical perspective. While attractive policies are already in place to incentivize wind energy development in Iran, the feed-in tariff (FiT) for wind energy has dropped to around 3 cents per kWh because of the sharp depreciation of the Iranian rial between 2018 and 2020. This paper shows that there is no economic justification for the development of wind farms in Iran at such low FiTs. A minimum FiT of...
Wind farm power output optimization using cooperative control methods
, Article Wind Energy ; 2020 ; Nobakhti, A ; Abdolahi, A ; Sharif University of Technology
John Wiley and Sons Ltd
2020
Abstract
We study the application of cooperative control and game theoretic approaches to wind farm optimization. The conventional (greedy) wind farm control strategy seeks to individually maximize each turbine power. However, this strategy does not maximize the overall power production of wind farms due to the aerodynamic interactions (wake effect) between the turbines. We formulate the wind farm power optimization problem as an identical interest game which can also be used to solve other cooperative control problems. Two model-free learning algorithms are developed to obtain the optimal axial induction factors of the turbines and maximize power production. The algorithms are simulated for a...
Wind farm power output optimization using cooperative control methods
, Article Wind Energy ; Volume 24, Issue 5 , 2021 , Pages 502-514 ; 10954244 (ISSN) ; Nobakhti, A ; Abdolahi, A ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
We study the application of cooperative control and game theoretic approaches to wind farm optimization. The conventional (greedy) wind farm control strategy seeks to individually maximize each turbine power. However, this strategy does not maximize the overall power production of wind farms due to the aerodynamic interactions (wake effect) between the turbines. We formulate the wind farm power optimization problem as an identical interest game which can also be used to solve other cooperative control problems. Two model-free learning algorithms are developed to obtain the optimal axial induction factors of the turbines and maximize power production. The algorithms are simulated for a...
Wind farm optimal connection to transmission systems considering network reinforcement using cost-reliability analysis
, Article IET Renewable Power Generation ; Volume 7, Issue 6 , 2013 , Pages 603-613 ; 17521416 (ISSN) ; Hosseini, S. H ; Sharif University of Technology
2013
Abstract
In this study, a novel network reinforcement model incorporating optimal wind farms (WFs) integration to power systems is proposed. Based on the reinforcement model, new transmission lines are added to the network for eliminating the transmission network congestion. In addition, a methodology for determining the WFs optimal capacities, the economical WF lines transfer rates and the appropriate reinforcement plan, whereas maximising the total benefit using cost-reliability analysis is presented. In this way, the objective of the proposed optimisation problem has been divided into a master problem and two subproblems. Benders decomposition is employed to connect the master and subproblems of...
Wind farm layout optimization using imperialist competitive algorithm
, Article Journal of Renewable and Sustainable Energy ; Vol. 6, Issue. 4 , July , 2014 ; ISSN: 19417012 ; Hannani, S. K ; Sharif University of Technology
Abstract
In this work, the wind farm layout optimization problem is dealt with using a new approach. The aim of wind farm layout optimization is to maximize the output power of a wind farm considering the wake losses. Layout optimization minimizes the wake losses regarding the location of the turbines. Three different wind scenarios with different wind direction angles, wind direction blowing probabilities, and Weibull distribution parameters are assumed. Since, the problem is nonlinear and constrained, imperialist competitive algorithm is used as a modern and powerful algorithm for continuous optimization problems. The optimization outcomes indicate that imperialist competitive algorithm yields...
Wind energy status of Iran: Evaluating Iran's technological capability in manufacturing wind turbines
, Article Renewable and Sustainable Energy Reviews ; Volume 15, Issue 8 , 2011 , Pages 4200-4211 ; 13640321 (ISSN) ; Mousavi, S. M ; Nasiri, M ; Moallemi, E. A ; Yousefdehi, H ; Sharif University of Technology
Abstract
Iran, as a developing country, will be confronted with a significant increase in electricity demand in future years. Being a petroleum producing country has resulted in extreme subsidies for energy production from fossilized resources such as oil and gas. This issue is one of the most important factors regarding underdevelopment of renewable energies in Iran. Expansive use of fossil resources in providing the necessary energy has resulted in Iran being among the 20 countries that have a share in the 75% spread of greenhouse gases. This issue has resulted in greater attention on behalf of the energy sectors policy makers regarding renewable energies, especially wind. Awareness regarding the...
Wind energy conversion system based on DFIG with open switch fault tolerant six-legs AC-DC-AC converter
, Article Proceedings of the IEEE International Conference on Industrial Technology, Cape Town ; February , 2013 , Pages 1656-1661 ; 9781467345699 (ISBN) ; Zolghadri, M. R ; Poure, P ; Saadate, S ; The Institute of Electrical and Electronics Engineers (IEEE); IEEE Industrial Electronics Society (IES); IEEE Technology Management Council; IEEE Region 8; IEEE South Africa Section IE/IA/PEL Joint Chapter ; Sharif University of Technology
2013
Abstract
Continuity of service of wind energy conversion systems as well as their reliability and performances are some of the major concerns in this power generation area. Six-legs AC/DC/AC converters are normally used in modern wind energy systems like as in the system with a doubly-fed induction generator (DFIG). A sudden failure of the converter can lead to the total or partial loss of the control of the phase currents and can cause serious system malfunction or shutdown. Therefore, to prevent the spread of the fault to the other system components and to ensure continuity of service, fault tolerant converter topologies associated to quick and effective fault detection and compensation methods...
Vibration monitoring of wind turbine blade using fiber bragg grating
, Article Wind Engineering ; Volume 34, Issue 6 , 2010 , Pages 721-731 ; 0309524X (ISSN) ; Zabihollah, A ; Zareie, S ; Sharif University of Technology
2010
Abstract
Rapid growth in generating power from wind turbines led to application of long laminated composite blades. However, as the length of blades increases, the risk of failure due to excessive vibration increases. Therefore, a reliable wind power generator requires an efficient and accurate, yet economical structural health monitoring system to detect vibration and apply a reliable control to prevent from unpredicted failure. This paper presents an optimal, low cost and continuous vibration monitoring system for laminated composite blades using Fiber Bragg Grating (FBG). Utilizing a layerwise displacement theory, the Finite Element (FEM) model has been developed for the wind turbine blade. The...
UWB wireless: A scheme for SCADA communications in offshore wind farms
, Article International Journal of Ultra Wideband Communications and Systems ; Volume 3, Issue 2 , 2015 , Pages 59-67 ; 1758728X (ISSN) ; Talebi, S ; Rashidinejad, M ; Sharif University of Technology
Inderscience Enterprises Ltd
2015
Abstract
Utilisation of reliable communication technologies for data communication is a key challenge in smart grids. Due to specific characteristics of offshore wind farms (OWFs), wireless data communications is of interest for supervisory control and data acquisition (SCADA) communication between wind towers. The ultra-wideband (UWB) communication technology is one of the state-of-the-art communication technologies suitable for inexpensive, low-data rate, outdoor, long-range, communication applications. However, in order to employ it in OWFs, its link modelling and performance must first be well analysed comprehensively. In this paper, the UWB communication channel is modelled in OWFs and with...
Using Web-GIS technology as a smart tool for resiliency management to monitor wind farms performances (Ganjeh site, Iran)
, Article International Journal of Environmental Science and Technology ; 2018 ; 17351472 (ISSN) ; Abbaspour, M ; Radfar, R ; Mohammadi, A ; Sharif University of Technology
Center for Environmental and Energy Research and Studies
2018
Abstract
Considering the wide spread locations of wind farms in Iran, it is important to develop a suitable decision support system (DSS) to fulfill proper management of wind farms. Extensive literature survey indicates that there are no integrated forms of DSS to manage a set of wind farms. The existing wind farms are performing independently, and there is no practical method for exchanging the online data. DSS can contribute to optimal operation of wind farms, operation and maintenance scheduling, pricing policy, etc. In this study, a geographic information system and RETSCREEN software were linked to the designed DSS to achieve a more suitable result. Also, a huge number of data are constantly...