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A Study Of Wind Powered Turbine Generation
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Improvement in the design of VSCF machine has led to the development of special type called the “Double Output Induction Generator†(DOIG). In this, the solid state handling only the slip power and this seems an interesting comparism between the VSCF and CSCF Systems.
The solid state electronics is used for rectification and the line commutator inverter inverts the slip power back to alternating current. Another version of the VSCF system has power output at modulated frequency higher than the system frequency fs (say 50Hz) and processes it down to the system frequency, fs by the electronic circuitry. The system uses an 8.C exited alternator having a modulated output. So the output is an amplitude –modulated wave. The speed of the rotor of the machine nr-Lnw
Where nw = wind speed
L = loss factor
Thus the output is a modulated signal consisting of (fr + fs) and (fr – fs) components.
Fig 4.1i shows the output of a varying speed generator couple to a rectifier. The varying frequency of the generated power is rectified and inverted again in order to achieve a constant frequency supply. The field of the generator is excited with d.c current.
The same process used in fig 4.1i but the field coil of the generation is excited with alternating current at the system frequency, fs. The effect of the a.c excitation of the field is a modulated power output with the excitation frequency as shown. Thus if the system (excitation) frequency is 50Hz, the generator output frequency will always be fr = + 50H2 and after the conversion to a.c, a filter network is used to removed the rotor frequency components.
In fig 4.1iii some principle applied in fig 4, 1ii is used but the commutator above does the operation of the rectifier, inverter and filter. Thus the a.c commutator generator seems to be simplest methods to obtain constant frequency output from a varying speed wind machine. Fig 4. 1iv shows a Double output induction Generator (DOIG) where the slip frequency is derived from the slip rings. One output is derived from the stator while the second output is derived from a line-cumulated inverter
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ABSRACT - [ Total Page(s): 1 ]ABSTRACTThe (PHCH) Power Holding Company of Nigeria Plc, effort to provide us with a regular power supply has not yet been achieved. And it is because of the search for another means of power generation that necessitated the development of wind turbine.The wind energy is abundant in several parts. Among the numerous natural energy resources that Nigeria was blessed with, wind is among the once in great quantity. Wind can be used in conjunction with turbines to produce electricity in isolation to ... Continue reading---
TABLE OF CONTENTS - [ Total Page(s): 1 ]TABLE OF CONTENTSTitle page Approval page Dedication Acknowledgement Abstract Table of contents CHAPTER ONE1.0 Introduction 1.1 Background of study 1.2 Energy from wind CHAPTER TWO2.0 Consideration for wind powered generator 2.1 Basic principal of wind power generation 2.2 Performance CHAPTER THREE LITERATURE REVIEW3.0 Types of wind machine 3.1 Horizontal axis wind turbine 3.2 Vertical axis wind turbine ... Continue reading---
CHAPTER ONE - [ Total Page(s): 2 ]CHAPTER ONE1.0 INTRODUCTIONSince ancient times, people have harnessed the winds and energy. Over 5,000 years ago, the ancient Egyptians used wind to sail ships on the Nile River. Later, people built wind mills to grind wheat and other grains. The earliest known wind mills were in Persia. These early wind mills looked like large paddle wheels. Centuries later, the basic design of the wind mills was improved. It was given a propeller type blade. The evolution has been slow but continuous, wi ... Continue reading---
CHAPTER TWO - [ Total Page(s): 3 ]CHAPTER TWO2.0 CONSIDERATION FOR WIND POWERED GENERATORIn the 1970s, oil shortage pushed the development of alternative energy source. In 1990s, the push came from a renewed concern for the environment in response to scientific studies indicating potential changes to the global climate if the use of fossils fuels continuous to increase. Wind is a clean fuel; wind farms produce no air or water pollution because no fuel is burnt.Providing new cost effective advanced and innovative technologi ... Continue reading---
CHAPTER THREE - [ Total Page(s): 3 ]CHAPTER THREE LITERATURE REVIEW3.0 TYPE OF WIND MACHINEThere are two types of wind machine (turbines) used today. This classification is based on the direction of the rotating shaft (AXIS). Horizontal- axis wind machine Vertical – axis wind machine. The size of wind machine varies widely. Small turbines used to power a single home or business. This may have a capacity of 100 kilowatts. Some large commercial sized turbines may be up to 5 million watts or 5 watts. Large turbines are t ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 3 ]5.3 ADVANTAGESThe advantages that wind power generation gives are enormousi) It relies on the renewable power of the wind which can’t be used up. That is it is fueled by wind.ii) These sources do not use burning fuel thus avoiding the inconveniences of supply and the dangers that arise through their storage.iii) Wind energy turbine doesn’t pollute the air like power plants that rely on combustion of fossil fuel such as coal or natural gas which when burnt go ... Continue reading---
CHAPTER SIX - [ Total Page(s): 1 ]CHAPTER SIXCONCLUSIONAs the need to stabilize the nation’s energy resource and electricity demands, renewable energy comes into play and also at a time when customers across the country are facing electricity rate hikes due to supply shortage, wind power is an attractive option to consumers and business alike.Wind energy works because it generates energy without fuel. While providing a reliable edge against rising energy cost. Wind energy works because the wind energy industry is a good s ... Continue reading---
REFRENCES - [ Total Page(s): 1 ]REFERENCE1. Anderson. S.P.D.L Freeman, D.L Elliott and RL George Wind Energy Atlas Pacific Norwest Laboratory, Richland Washington 1981.2. Anderson S.P.D, Pacific Norwest Laboratory.3. Baker R.W and E.W Hewson Network Wind Power Over the Pacific Norwest Bonneville Power Administration, Portland 1981.4. Baker R.N and E.W. Hewson Network Wind Power Over the Pacific Norwest.5. Black and Veatch Power Plant Engineering Chapman and Hall New Yoke 1996.6. Black ... Continue reading---
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ABSRACT - [ Total Page(s): 1 ]ABSTRACTThe (PHCH) Power Holding Company of Nigeria Plc, effort to provide us with a regular power supply has not yet been achieved. And it is because of the search for another means of power generation that necessitated the development of wind turbine.The wind energy is abundant in several parts. Among the numerous natural energy resources that Nigeria was blessed with, wind is among the once in great quantity. Wind can be used in conjunction with turbines to produce electricity in isolation to ... Continue reading---