Modeling of Wind Energy on Isolated AreaIJPEDS-IAES
In this paper, a model of the wind turbine (WT) with permanent magnet generator (PMSG) and its associated controllers is presented. The increase of wind power penetration in power systems has meant that conventional power plants are gradually being replaced by wind farms. In fact, today wind farms are required to actively participate in power system operation in the same way as conventional power plants. In fact, power system operators have revised the grid connection requirements for wind turbines and wind farms and now demand that these installations be able to carry out more or less the same control tasks as conventional power plants. For dynamic power system simulations, the PMSG wind turbine model includes an aerodynamic rotor model, a lumped mass representation of the drive train system and generator model. In this paper we propose a model with an implementation in MATLAB / Simulink, each of the system components off-grid small wind turbines.
This paper presents a study analysis of a complete wind energy conversion system, the system based on a doubly fed induction generator (DFIG); a vector control with stator flux orientation of the DFIG is also used to control independently the active and reactive powers. A comparative study have been performed between the conventional PI controller and fuzzy logic control to investigate its dynamic and static performances. This research work involves the study of a phase in advance, to provide effective assistance, to all those who have to make decisions regarding the planning and implementation of wind energy projects. The main objective is to model the wind chain and the use of two types of strategies for the control of this generator to ensure a good regulation we started with the modeling of the wind chain then the modeling of the DFIG and then the use of the two strategies for the regulation of the latter .The complete system is modeled and simulated in the MATLAB/ Simulink. The performance and robustness are analyzed and compared by Matlab / Simulink .Simulation results prove the excellent performance of fuzzy control unit as improving power quality and stability of wind turbine.
The presentation includes the objective, operation, characteristics , simulation, results and waveforms of Doubly Fed Induction Generator connected to variable speed Wind Turbine. which is published and presented in IEEE international conference in Technological advancements of Power and Energy which was held in Amrita Vishwa Vidyapeetam, Amritapuri, Kerala.
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Modeling of Wind Energy on Isolated AreaIJPEDS-IAES
In this paper, a model of the wind turbine (WT) with permanent magnet generator (PMSG) and its associated controllers is presented. The increase of wind power penetration in power systems has meant that conventional power plants are gradually being replaced by wind farms. In fact, today wind farms are required to actively participate in power system operation in the same way as conventional power plants. In fact, power system operators have revised the grid connection requirements for wind turbines and wind farms and now demand that these installations be able to carry out more or less the same control tasks as conventional power plants. For dynamic power system simulations, the PMSG wind turbine model includes an aerodynamic rotor model, a lumped mass representation of the drive train system and generator model. In this paper we propose a model with an implementation in MATLAB / Simulink, each of the system components off-grid small wind turbines.
This paper presents a study analysis of a complete wind energy conversion system, the system based on a doubly fed induction generator (DFIG); a vector control with stator flux orientation of the DFIG is also used to control independently the active and reactive powers. A comparative study have been performed between the conventional PI controller and fuzzy logic control to investigate its dynamic and static performances. This research work involves the study of a phase in advance, to provide effective assistance, to all those who have to make decisions regarding the planning and implementation of wind energy projects. The main objective is to model the wind chain and the use of two types of strategies for the control of this generator to ensure a good regulation we started with the modeling of the wind chain then the modeling of the DFIG and then the use of the two strategies for the regulation of the latter .The complete system is modeled and simulated in the MATLAB/ Simulink. The performance and robustness are analyzed and compared by Matlab / Simulink .Simulation results prove the excellent performance of fuzzy control unit as improving power quality and stability of wind turbine.
The presentation includes the objective, operation, characteristics , simulation, results and waveforms of Doubly Fed Induction Generator connected to variable speed Wind Turbine. which is published and presented in IEEE international conference in Technological advancements of Power and Energy which was held in Amrita Vishwa Vidyapeetam, Amritapuri, Kerala.
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Modeling and Control of a Doubly-Fed Induction Generator for Wind Turbine-Gen...IJPEDS-IAES
This paper presents a vector control direct (FOC) of double fed induction generator intended to control the generated stator powers. This device is intended to be implemented in a variable-speed wind-energy conversion system connected to the grid. In order to control the active and reactive power exchanged between the machine stator and the grid, the rotor is fed by a bi-directional converter. The DFIG is controlled by standard relay controllers. Details of the control strategy and system simulation were performed using Simulink and the results are presented in this here to show the effectiveness of the proposed control strategy.
Active and Reactive Power Control of a Doubly Fed Induction GeneratorIJPEDS-IAES
Wind energy has many advantages, it does not pollute and it is an inexhaustible source. However, the cost of this energy is still too high to compete with traditional fossil fuels, especially on sites less windy. The performance of a wind turbine depends on three parameters: the power of wind, the power curve of the turbine and the generator's ability to respond to wind fluctuations. This paper presents a control chain conversion based on a double-fed asynchronous machine (D.F.I.G). To improve the transient and steady state performance and the power factor of generation, a stator flux oriented vector control scheme is used in this work. The vector control structure employs conventional PI controllers for the decoupled control of the stator side active and reactive power. The whole system is modeled and simulated using Matlab/Simulink and the results are analyzed.
Independent Control Of Active And Reactive Powers From DFIG By Logic FuzzyIJRES Journal
This paper presents the study and use by simulating the fuzzy logic control of asynchronous
generator dual fuel in the production of electrical energy that the .for I prepared a study of the wind system and
a model of the wind turbine was established by following the study and modeling of doubly fed asynchronous.
Two types of vector control have been the subject of study in this work for independent control of active and
reactive power: the direct and indirect control .la fuzzy PI control is introduced to increase the robustness of
markers vis-à-screw parametric variation of the machine in the simulation results obtained were compared to the
validated work articles cited in the bibliography.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
This report gives an overview of patenting activity around Doubly-fed Induction Generators (DFIG) used in the horizontal axis wind turbines for efficient power generation. Patents were categorized as per key DFIG technologies and analyzed for generating different trends within PatSeer Project.
Analysis and Implementation of Maximum Power Point Tracking Using Conventiona...ijtsrd
As we know, energy generated from the solar and wind systems is not necessarily continuous and consistent. In India, the weather also varies such that in gloomy conditions there will be limited power from the PV battery, while in summer it will be at its highest. So, the weather decreases the systems effectiveness. As a result, an energy efficient approach is required to find an optimum point of action to obtain the full amount of energy under various atmospheric conditions. This paper suggested an updated turbulence and maximal power point monitoring controller for wind and solar hybrid energy systems. The controller uses the modified fixed disruption and observation system to achieve the MPP by changing the service cycle of each input module. Results are presented on a 200W wind system as well as a 400W solar wind energy system with differing irradiation strength and wind speed to illustrate the merits of the experiment. Majhar Ali Ansari | Pramod Kumar Rathore "Analysis and Implementation of Maximum Power Point Tracking Using Conventional P & O Algorithm for Hybrid System in Different Atmospheric Conditions" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd46298.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/46298/analysis-and-implementation-of-maximum-power-point-tracking-using-conventional-p-and-o-algorithm-for-hybrid-system-in-different-atmospheric-conditions/majhar-ali-ansari
Modeling and Control of a Doubly-Fed Induction Generator for Wind Turbine-Gen...IJPEDS-IAES
This paper presents a vector control direct (FOC) of double fed induction generator intended to control the generated stator powers. This device is intended to be implemented in a variable-speed wind-energy conversion system connected to the grid. In order to control the active and reactive power exchanged between the machine stator and the grid, the rotor is fed by a bi-directional converter. The DFIG is controlled by standard relay controllers. Details of the control strategy and system simulation were performed using Simulink and the results are presented in this here to show the effectiveness of the proposed control strategy.
Active and Reactive Power Control of a Doubly Fed Induction GeneratorIJPEDS-IAES
Wind energy has many advantages, it does not pollute and it is an inexhaustible source. However, the cost of this energy is still too high to compete with traditional fossil fuels, especially on sites less windy. The performance of a wind turbine depends on three parameters: the power of wind, the power curve of the turbine and the generator's ability to respond to wind fluctuations. This paper presents a control chain conversion based on a double-fed asynchronous machine (D.F.I.G). To improve the transient and steady state performance and the power factor of generation, a stator flux oriented vector control scheme is used in this work. The vector control structure employs conventional PI controllers for the decoupled control of the stator side active and reactive power. The whole system is modeled and simulated using Matlab/Simulink and the results are analyzed.
Independent Control Of Active And Reactive Powers From DFIG By Logic FuzzyIJRES Journal
This paper presents the study and use by simulating the fuzzy logic control of asynchronous
generator dual fuel in the production of electrical energy that the .for I prepared a study of the wind system and
a model of the wind turbine was established by following the study and modeling of doubly fed asynchronous.
Two types of vector control have been the subject of study in this work for independent control of active and
reactive power: the direct and indirect control .la fuzzy PI control is introduced to increase the robustness of
markers vis-à-screw parametric variation of the machine in the simulation results obtained were compared to the
validated work articles cited in the bibliography.
International Journal of Engineering Research and Applications (IJERA) is a team of researchers not publication services or private publications running the journals for monetary benefits, we are association of scientists and academia who focus only on supporting authors who want to publish their work. The articles published in our journal can be accessed online, all the articles will be archived for real time access.
Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
This report gives an overview of patenting activity around Doubly-fed Induction Generators (DFIG) used in the horizontal axis wind turbines for efficient power generation. Patents were categorized as per key DFIG technologies and analyzed for generating different trends within PatSeer Project.
Analysis and Implementation of Maximum Power Point Tracking Using Conventiona...ijtsrd
As we know, energy generated from the solar and wind systems is not necessarily continuous and consistent. In India, the weather also varies such that in gloomy conditions there will be limited power from the PV battery, while in summer it will be at its highest. So, the weather decreases the systems effectiveness. As a result, an energy efficient approach is required to find an optimum point of action to obtain the full amount of energy under various atmospheric conditions. This paper suggested an updated turbulence and maximal power point monitoring controller for wind and solar hybrid energy systems. The controller uses the modified fixed disruption and observation system to achieve the MPP by changing the service cycle of each input module. Results are presented on a 200W wind system as well as a 400W solar wind energy system with differing irradiation strength and wind speed to illustrate the merits of the experiment. Majhar Ali Ansari | Pramod Kumar Rathore "Analysis and Implementation of Maximum Power Point Tracking Using Conventional P & O Algorithm for Hybrid System in Different Atmospheric Conditions" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd46298.pdf Paper URL: https://www.ijtsrd.com/engineering/electrical-engineering/46298/analysis-and-implementation-of-maximum-power-point-tracking-using-conventional-p-and-o-algorithm-for-hybrid-system-in-different-atmospheric-conditions/majhar-ali-ansari
Focused Exploration of Geospatial Context on Linked Open DataThomas Gottron
Talk at IESD 2014 workshop in Riva del Garda (at ISWC).
Abstract The Linked Open Data cloud provides a wide range of different types of information which are interlinked and connected. When a user or application is interested in specific types of information under time constraints it is best to ex- plore this vast knowledge network in a focused and directed way. In this paper we address the novel task of focused exploration of Linked Open Data for geospatial resources, helping journalists in real-time during breaking news stories to find contextual geospatial information related to geoparsed content. After formalising the task of focused exploration, we present and evaluate five approaches based on three different paradigms. Our results on a dataset with 425,338 entities show that focused exploration on the Linked Data cloud is feasible and can be implemented at very high levels of accuracy of more than 98%.
IOSR journal of VLSI and Signal Processing (IOSRJVSP) is an open access journal that publishes articles which contribute new results in all areas of VLSI Design & Signal Processing. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced VLSI Design & Signal Processing concepts and establishing new collaborations in these areas.
Renewable Energy Sources are those energy sources which are not destroyed when their energy is harnessed. Human use of renewable energy requires technologies that harness natural phenomena, such as sunlight, wind, waves, water flow, and biological processes such as anaerobic digestion, biological hydrogen production and geothermal heat. Amongst the above mentioned sources of energy there has been a lot of development in the technology for harnessing energy from the wind.
Control of the powerquality for a DFIG powered by multilevel inverters IJECEIAES
This paper treats the modeling, and the control of a wind power system based on a doubly fed induction generator DFIG, the stator is directly connected to the grid, while the rotor is powered by multilevel inverters. In order to get a decoupled system of controlfor an independently transits of active and reactive power, a vector control method based on stator flux orientation SFOC is considered: Direct vector control based on PI controllers. Cascaded H-bridge CHBI multilevel inverters are used in the rotor circuit to study its effect on supply power quality. All simulation models are built in MATLAB/Simulink software. Results and waveforms clearly show the effectiveness of vector control strategy. Finally, performances of the system will tested and compared for each levels of inverter.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Power Quality Improvement Using Custom Power Devices in Squirrel Cage Inducti...IJPEDS-IAES
Wind farm is connected to the grid directly.The wind is not constant voltage fluctuations occur at point of common coupling (PCC) and WF terminal. To overcome this problem a new compensation strategy is used. By using Custom power devices (UPQC).It injects reactive power at PCC. The advantages of UPQC are it consists of both DVR and D-STATCOM. DVR is connected in series to the line and it injects in phase voltage into the line .D- STATCOM is connected shunt to the line .The internal control strategy is based on management of active and reactive power in series and shunt converters of UPQC. The power exchainge is done by using DC-link.
journal publishing, how to publish research paper, Call For research paper, i...IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Dynamic responses improvement of grid connected wpgs using flc in high wind s...ijscmcj
Environmental and sustainability concerns are developing the significance of distributed generation (DG) based on renewable energy sources. In this paper, dynamic responses investigation of grid connected wind turbine using permanent magnet synchronous generator (PMSG) under variable wind speeds and load circumstances is carried out. In order to control of turbine output power using Fuzzy Logic controller (FLC) in comparison with PI controller is proposed. Furthermore, the pitch angle based on FLC using wind speed and active power as inputs, can have faster responses, thereby leading to smoother power curves, enhancement of dynamic performance of wind turbine and prevention of mechanical damages to PMSG. Inverter adjusted the DC link voltage and active power is fed by d-axis and reactive power is fed by q-axis (using P-Q control mode). Simulation of wind power generation system (WPGS) is carried out in Matlab/Simulink, and the results verify the correctness and feasibility of control strategy.
DYNAMIC RESPONSES IMPROVEMENT OF GRID CONNECTED WPGS USING FLC IN HIGH WIND S...ijscmcjournal
Environmental and sustainability concerns are developing the significance of distributed generation (DG) based on renewable energy sources. In this paper, dynamic responses investigation of grid connected wind turbine using permanent magnet synchronous generator (PMSG) under variable wind speeds and load circumstances is carried out. In order to control of turbine output power using Fuzzy Logic controller (FLC) in comparison with PI controller is proposed. Furthermore, the pitch angle based on FLC using wind speed and active power as inputs, can have faster responses, thereby leading to smoother power curves, enhancement of dynamic performance of wind turbine and prevention of mechanical damages to PMSG. Inverter adjusted the DC link voltage and active power is fed by d-axis and reactive power is fed by q-axis (using P-Q control mode). Simulation of wind power generation system (WPGS) is carried out in Matlab/Simulink, and the results verify the correctness and feasibility of control strategy.
Design Construction, Simulation and Testing of A 300W Wind-Powered Battery Ch...theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Power Control of Wind Turbine Based on Fuzzy Sliding-Mode ControlIJPEDS-IAES
This paper presents the study of a variable speed wind energy conversion system (WECS) using a Wound Field Synchronous Generator (WFSG) based on a Fuzzy sliding mode control (FSMC) applied to achieve control of active and reactive powers exchanged between the stator of the WFSG and the grid to ensure a Maximum Power Point Tracking (MPPT) of a wind energy conversion system. However the principal drawback of the sliding mode, is the chattering effect which characterized by torque ripple, this phenomena is undesirable and harmful for the machines, it generates noises and additional forces of torsion on the machine shaft. A direct fuzzy logic controller is designed and the sliding mode controller is added to compensate the fuzzy approximation errors. The simulation results clearly indicate the effectiveness and validity of the proposed method, in terms of convergence, time and precision.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
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1. IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 7, Issue 5 (Sep. - Oct. 2013), PP 25-29
www.iosrjournals.org
www.iosrjournals.org 25 | Page
The Wind Powered Generator
Dr O A Ezechukwu
Department Of Electrical Engineering Nnamdi Azikiwe University Awka
Abstract: The inability of Nigeria’s electricity power company (PHCN) to meet the demands of Nigerian
consumers necessitates an aggressive search for alternative energy supply. There are many wind catchment
sites at various locations in this country. In this paper the possibility of using wind power to feed isolated loads
and/or being synchronized with the public supply is discussed. Before that, the principle of operation of wind
powered generator is discussed. At the end, possible sites, within Nigeria, where the wind powered generator
can be installed, to achieve optimum result, are highlighted.
Keywords: Wind powered generation, CSCF machine, wind catchment area, VSCF machine,
I. Introduction
The wind mill was used in agriculture, in olden days, to pump water in farms and to drive mechanical
loads. Today the wind mill is staging a come back in a big way since modern technology has transformed it into
a more useful machine.
The wind turbine is simply a device for converting the power in the wind to mechanical energy, at the
first stage. At the second stage, the mechanical energy is converted to electrical energy. At the first stage,
mechanical loads such as water pumps, grinders, etc, can be coupled to the rotating shaft of the machine. At the
second stage, electricity generated can be used to drive electrical loads. More than one machine can be used to
drive large loads when they are connected in a special way (paralleling)
II. Principles Of Operation
The power in the wind, Pw=mKE
=mv2
/2kc (1)
Where KE is the kinetic energy of the wind stream,
m is the mass flow rate (kg/s)
v= velocity of the wind (m/s) and
kc= conversion factor
The mass flow rate, m =∂AV (2)
Where;
∂=density of the wind
A= cross sectional area of the wind stream.
Substituting value of m in eqn(1),
Pw=∂aV3
/2Kc (3)
If maximum power, Pmax=8∂AV2
/27Kc
Then maximum theoretical efficiency, ŋmax=Pmax/Pw=8x2Kc/27Kc= 16/27=59.3% (4)
The real efficiency, ŋ =Actual output power, Pa/input power, Pw
Or Pa=ŋPw=ŋ∂AV3
/2Kc (5)
And ŋ varies between 30% and 40%.
III. Forces On The Blades
There are two forces acting on the propeller type blade: the axial force acting in the direction of the
wind stream and the circumferential forces acting in the direction of rotation of the turbine wheel. The
circumferential force, Fc , is responsible of producing the rotational torque.
The circumferential torque, 𝑇𝑐 =
𝑃𝑎
πDN 6
Where 𝑃𝑎= actual power output
D= diameter of the rotor shaft= 4A/π
N=speed (m/s) and
A= cross sectional area of the shaft.
For the machine of eqn(5), circumferential torque, 𝑇𝑐 = 𝜋𝐷𝑉3
8𝑘𝑐 7
The axial thrust, 𝐹𝑎 = ∂A V2
− V0
2
2kc 8
Where:
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V=input velocity
V0= exit velocity
IV. Mean Wind Energy
The mean wind energy can be calculated from the mean wind speed measured at different intervals.
Mean wind speed, 𝑉𝑎𝑣 = 𝑉3
/𝑛𝑛
1
1
3 (9)
Where n is the number of observations
Mean wind energy, 𝐸 𝑚 = 𝑝 𝑚 𝑡 =
∂at𝑉𝑎𝑣
3
2𝑘 𝑐
=
∂at 𝑉3
/𝑛𝑛
1
1
3
3
2kc
(10)
Where t=consumption interval,
Pm= mean power.
The wind energy conversion system consists of ;
1.The aerodynamic system which receives the wind power, Pw and converts it to mechanical power, Pm,
2.Mechanical transmission system where mechanical power is converted to electrical power, Pg and
3.The electrical system where the generated power is processed to suit electrical load.
Fig1 shows the components of the wind conversion system where K1, K2 and K3 are conversion factors.
The power in the wind, Pw is converted to mechanical power, Pm by the aerodynamic system. K1 is a factor
which determines the efficiency of conversion and depends on the type, shape and nature of the aerodynamic
system
So Pm=K1Pw. Similarly, K2 and K3 are factors which determine the efficiency of conversion from mechanical to
electrical and from generated electrical power to processed power output respectively; k2Pm=Pg and Po=k3Pg.
So total power output from the wind turbine, 𝑃𝑜 = 𝑘1 𝑃𝑤 𝑘2 𝑃𝑚 𝑘3 𝑃𝑔 = 𝑘1 𝑘2 𝑘3 𝑃𝑤 𝑤𝑎𝑡𝑡𝑠 11
There are two basic techniques:
(i) To keep both the turbine speed and frequency constant by manipulating the generator characteristics or
adjusting the turbine blade pitch. This system is referred to as constant speed, constant frequency system
(CSCF).
(ii) To keep the frequency constant while the speed varies (with power output). This model is called the variable
speed, constant frequency system (VSCF).see fig2 for the power- duration curves.
Fig2: Power-Duration curve for wind turbine
IV. The Constant Speed Constant
FREQUENCY (CSCF) SYSTEM
The wind strikes the aerodynamic system, and since the wind speed varies, the turbine rotor speed
varies also, resulting in variable output. The pitch of the turbine blade can be adjusted to maintained constant
0 0.5 1 1.5 2 2.5
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
duration-hrs/year
power
power-duration curve for wind turbine
CSCF
VSCF
unavailable energy due
cut-into
poPw
Fig 1: The wind energy conversion system
K1Pw K2Pm
K3Pg
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speed irrespective of the wind speed. The frequency of the machine may vary as the wind speed because the
machine is connected to a d.c exited alternator but when the machine is synchronized to the grid, the grid
frequency toes it’s varying frequency. Therefore the wind turbine must be made to run at synchronous speed,
Ns=f/p. where; f=output frequency and P=number of pairs of poles.
Induction machines are usually used as wind turbine generators. They maintain fairly constant speed at lower
slip. When operated above synchronous speed (negative slip) the induction machine becomes a generator and
when connected to the grid, it runs at grid frequency.
V. Variable Speed Constant Frequency (Vscf)
In this technique, the ratio, turbine rotor speed (Nr) /wind speed (Nw), determines the conversion
factor,K1. The machine’s rotor is allowed to run at the wind speed. That is, Nr is proportional to Nw. When K1 is
maximum, there is maximum efficiency of conversion from wind energy to mechanical energy. Since constant
frequency is required, the output of the machine is rectified and fed to an inverter tuned to produce constant
frequency. VSCF machine is more reliable but more expensive due to additional electronics circuitry (for
rectification and inversion) than the CSCF machine
Another version of VSCF machine is an alternating voltage excited generator which produces
amplitude modulated output. The rotor speed, Nr=LNw. Where L=loss factor. So the modulated output power is
made up of fr+fs and fr-fs components. Where fr=rotor frequency and fs=system frequency used for excitation.
The power-duration curve of the systems is shown in fig2.
VI. Materials And Methods
Induction machines used for electric power generation can be either dc excited or ac excited. In dc
excited system, at normal excitation, the reactive component is small, but when over excited, the reactive power
increases at the expense of the active power. With ac excitation, the power output is a modulated wave with
frequencies fr+fs and fr- fs as mentioned earlier. To maintain constant frequency, the power output is rectified
and fed to an inverter which is tuned to produce constant output frequency. Another approach is to use a dc
generator whose output is regulated and fed into an inverter tuned at grid frequency. The latest development is
the introduction of double induction generator (DOIG) where the slip rings supply the slip frequency. The line
cumulated inverter produces one output while the other output is derived from the stator.
VII The Aerodynamic System
There are two basic types of aerodynamic system; the vertical axis machines and the horizontal axis
machines. See figs. A 1 and 2 in appendix.
In horizontal axis machines, the starting force, 𝐹𝑠 = 𝑘𝐹𝑤𝑚 + 𝐹𝑔 12
Where: k= factor, Fwm= Maximum force produced by the wind and Fg= gravitational force (9.81N). Horizontal
machines using propeller blades do not have starting problems when they are properly oriented. They start at
minimum wind speed. The vertical axis machines do not need to be oriented to the wind direction before their
vanes can freely rotate. The effect of gravity is negligible on them unlike the horizontal axis machines.
VIII Possible Sites For Wind Powered Generator In Nigeria
Nigeria has only few meteorological centers and unfortunately records seen so far about wind energy
and speed are not very comprehensive.
For the three meteorological centers considered here, PortHarcourt, Bauchi and Akure; PortHarcourt
and Bauchi readings are based on Beaufort scale and wind speeds were not checked on hourly bases. This could
give room for inaccuracies more so when conversion is to be made from the beaufort scale to the actual values.
At Bauchi center, readings were taken for thirteen years while at PortHarcourt center; readings were taken for
fourteen years. At Akure center, readings were taken in actual values but for only two years and again, readings
were not taken on hourly bases. Unfortunately, as at the time of investigation, no meteorological center is
located in any of our beaches; PortHarcourt, Lagos, Calabar, etc which are good wind catchment sites.
In actual fact, there is no part of Nigeria where the wind turbine cannot work but there are some sites that can be
used as medium or large wind farms: An example of areas for large scale wind farms are all the beaches in the
country, some areas in Bauchi and Sokoto where the mean wind speed are high (2.32-5.2m/s). Some of the high
lands in various parts of the country and some part of the riverrine areas can serve as medium scale wind farms.
IX . Viability In Nigeria
Nigeria generates her electricity power from two major sources-hydro and gas. There are three hydro
stations at Kainji, Jebba and Shiroro with total installed capacity of 1,936 Mw. The rest are predominantly
thermal/gas stations located at Afam, Sapele, Ogorode (delta), Egbin, etc with total installed capacity of about
8264Mw. The generated power in this country is grossly inadequate. To worsen the situation, there are lots of
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other limitations in both transmission and distribution sectors, like transformers, cable sizes and others. They
make it difficult for the consumers to enjoy steady electricity supply. Although some of the power stations are
now being renovated and upgraded, the maximum demand is far not met. See fig4
Fig4: Power supply in Nigeria from 2000 to 2012
The wind power generator will succeed in Nigeria because the lack luster performance of the public electricity
supply company, the PHCN, is disturbing the electricity consumers; as such, those leaving in good wind
catchment areas will not hesitate to ask for the machines.
Wind powered generators can be installed in remote areas where erection of power lines pose some problems
due to the nature of the area. For example, the islands or areas located in swamps, such as those in Niger Delta
area of the south-south and also in small isolated towns and villages located in rocky highlands.
The total cost of the wind turbine system, Ct, can be expressed as 𝐶𝑡 = 𝐶𝑐 𝐶𝑎 + 𝐶 𝑚 𝑇𝑃𝑓 𝐴 𝑚 𝐿𝑓 13
Where;
Cc=Capital cost for the machine.
Ca=Annual charge rate
Cm= Maintenance and operational costs
T= total operational hours per year
Pf= the load factor and
Lf= factor for losses
Let the total installed power for n machines,𝑃𝑡 = 𝑃𝑖
𝑛
𝑖=1 𝑤𝑎𝑡𝑡𝑠
If the total load, Lt, connected to the system. 𝐿𝑡 = 𝐿𝑗
𝑛
𝑗=1 𝑤𝑎𝑡𝑡𝑠 . To meet the maximum demand, 𝑃𝑡 ≥ 𝐿𝑡
That is, 𝑃𝑖
𝑛
𝑖=1 ≥ 𝐿𝑗
𝑛
𝑗 =1 14
For longevity, it is recommended that machines should not be operated beyond 80% of their rated capacity if
they are to be in continuous operation.
So for utilization factor of 0.8 and diversity factor, d, the system loss, 𝐿𝑙 = 0.8𝑃𝑖 − 𝑑𝐿𝑗 15𝑛
𝑖=1,𝑗 =1
The probability that the system will be stable after T years, 𝑃𝑠 =
𝑡 𝑠𝑖
𝑇
𝑖=1
𝑇8760
16
Where;
T=Number of years the system is under operation.
ts = No of times the system is stable in a year.
X. Conclusion
The wind powered generator is in two basic forms: The constant speed, constant frequency (CSCF)
and the variable speed, constant frequency (VSCF) types. The VSCF system is more reliable but more
expensive than the CSCF system but the double induction machine seems to be more advantageous than both of
them.
The wind powered generator will prosper in Nigeria, more especially at the beaches and various highlands at
various locations in the country. Smaller machines can be paralleled to feed large loads.
References
[1]. M M Wakil Power plant technology. McGrawhill books N/York 1984.
[2]. T Swifthook Donald. Wind energy IEE review Jan.1988 pg30-31
[3]. J S Jayadev. Windmill stage a come back. IEEE spectrum Nov 1976 pg 44.
[4]. O A Ezechukwu: Harnessing the wind energy for better farm machineries, GAA/Carl Dieisberg. Ges. Germany. I S. Bethel house
25/26th
Sep 2002
[5]. A S Sambo. Renewable energy technology for national development. The NSE Nigerian Engineer, Vol 31 No1, March 2001 pg28
[6]. National Electric power Auth. (NEPA). Generation statistics for 05/02/2002
5. The Wind Powered Generator
www.iosrjournals.org 29 | Page
[7]. 7 PHCN. Power generation statistics Aug.12th
2012
APPENDIX
Fig A3: The velocity-power curve for the wind.
10 20 30 40 50 60 70 80 90 100
0
1
2
3
4
5
6
7
8
9
10
x 10
5
power
velocity
wind power/velocity relationship
FigA2: some vertical axis machines
Φ-Darrius ∆-Darrius Savonius
FigA1: Some horizontal axis machines
Farm wind mill Dutch wind mill
3 propeller
blade wind mill
2- Propeller
blade wind mill
1- Propeller
blade wind mill