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GENERATOR AND ELECTRICAL SYSTEM be connected to. The result of the rectification is denoted ripple current and shown on figure 7.5. Figure 7.5: The result of 3-phased AC converted into DC ripple current [34] As stated in the requirement list, ID 2, the system voltage must be 48 V DC. This means that the rippled output voltage from the rectifier must be at least 48 V before any voltage is transmitted to the batteries. The angular velocity of the generator, at which the voltage of 48 V is reached, is the cut-in speed, i.e. 250 rpm as described in section 7.1. Input breaker An input breaker, or circuit breaker, is an automatic switch, which protects the system from damage caused by overload. If a fault condition is detected the input breaker imme- diately discontinues the electric flow. When the breaker is activated the wind turbine is be free spinning, as there is no resistance from the generator. The previously described shut- down switch should therefore be activated once the input breaker is activated in order to brake the wind turbine. Battery Bank It is recommended to use deep-cycle lead-acid batteries, which, contrary to normal lead- acid automotive batteries, may be fully discharged without damage. The size of the battery bank and the manner in which the individual batteries are connected depends on the spe- cific needs and will therefore vary from site to site. Earthing system IEC 61400-2 requires that the wind turbine design includes a local earthing system, which ensures that tower (including guy wires) are appropriately earthed to reduce damage from lightning [5, p. 111]. 73
GENERATOR AND ELECTRICAL SYSTEM 74 7.3 Summary Several types of generators with different advantages and disadvantages were presented as options for the wind turbine design. The AFPM generator was selected due to the fact that it does not require any transmission and due to the possibility of building the generator locally in a developing country. The working principle of the chosen generator was described and a peripheral descrip- tion was made of the components of the electrical system. In-depth design of the generator and development of power control and energy storage devices was stated as beyond the scope of this project thesis.
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WIND TURBINE DESIGN
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ABSTRACT At the request of the Engi
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CONTENTS 1 Introduction ...........
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E Structural analysis of blades ...
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INTRODUCTION members. Today EWB-DK
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INTRODUCTION Figure 1.2: Left pictu
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INTRODUCTION 6
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PROBLEM STATEMENT reconfigured with
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PROBLEM STATEMENT 10
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METHODOLOGY Figure 3.1: Flow chart
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METHODOLOGY 14 3.1 Calculation meth
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CONCEPTUALISATION the kinetic wind
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CONCEPTUALISATION Figure 4.3: (a) D
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CONCEPTUALISATION issues due to tur
Page 29 and 30: CONCEPTUALISATION 22 Figure 4.8: Ty
Page 31 and 32: CONCEPTUALISATION � Darrieus 24 F
Page 33 and 34: CONCEPTUALISATION 26 Figure 4.13: G
Page 35 and 36: CONCEPTUALISATION Figure 4.14: Powe
Page 37 and 38: CONCEPTUALISATION 30 ID Requirement
Page 39 and 40: CONCEPTUALISATION most suitable sol
Page 41 and 42: CONCEPTUALISATION The embodiment de
Page 43 and 44: DESIGN PRESENTATION The main dimens
Page 45 and 46: DESIGN PRESENTATION The design prop
Page 47 and 48: DESIGN PRESENTATION The background
Page 49 and 50: ROTOR 42 6.1 Number of blades Moder
Page 51 and 52: ROTOR 44 Figure 6.4: Blade design s
Page 53 and 54: ROTOR Table 6.3 provides a material
Page 55 and 56: ROTOR Figure 6.7 displays the lift
Page 57 and 58: ROTOR Figure 6.9: Rotor power outpu
Page 59 and 60: ROTOR 6.2.3 Manufacturing During th
Page 61 and 62: ROTOR 54 The three sides of the tem
Page 63 and 64: ROTOR When the carving process is f
Page 65 and 66: ROTOR 58 Figure 6.17: Blade attachm
Page 67 and 68: ROTOR 60 Figure 6.19: Rotor power o
Page 69 and 70: ROTOR 62 Figure 6.22: Efficiency
Page 71 and 72: ROTOR sidering the output from the
Page 73 and 74: ROTOR 66
Page 75 and 76: GENERATOR AND ELECTRICAL SYSTEM 68
Page 77 and 78: GENERATOR AND ELECTRICAL SYSTEM The
Page 79: GENERATOR AND ELECTRICAL SYSTEM Fig
Page 83 and 84: YAW AND FURLING For an upwind wind
Page 85 and 86: YAW AND FURLING (16), which are bol
Page 87 and 88: YAW AND FURLING 80 8.2 Furling syst
Page 89 and 90: YAW AND FURLING 82 8.3 Summary The
Page 91 and 92: TOWER Concrete tower 84 Figure 9.1:
Page 93 and 94: TOWER 86 Figure 9.4: Turbulent air
Page 95 and 96: TOWER Figure 9.7 shows the tower ba
Page 97 and 98: TOWER models [41, p. 111]. Under ce
Page 99 and 100: ALTERNATIVE BLADE DESIGN 92 10.1 Ai
Page 101 and 102: ALTERNATIVE BLADE DESIGN 94 10.3 Su
Page 103 and 104: DESIGN EVALUATION 96 6 W Low-cost m
Page 105 and 106: DESIGN EVALUATION Weaknesses 1) The
Page 107 and 108: FURTHER DEVELOPMENT � Foundation
Page 109 and 110: FURTHER DEVELOPMENT 102
Page 111 and 112: CONCLUSION proposal is highly flexi
Page 113 and 114: NOMENCLATURE Abbreviation Descripti
Page 115 and 116: NOMENCLATURE Lgs Distance between u
Page 117 and 118: NOMENCLATURE 110
Page 119 and 120: BIBLIOGRAPHY [14] Magenn Power Inc.
Page 121 and 122: BIBLIOGRAPHY [53] H. J. Larsen, H.
Page 123 and 124: LIST OF ATTACHMENTSBASIS FOR CALCUL
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LIST OF ATTACHMENTSBASIS FOR CALCUL
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LIST OF ATTACHMENTSROTOR THEORY Thi
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LIST OF ATTACHMENTSROTOR THEORY 134
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LIST OF ATTACHMENTSROTOR THEORY Cho
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LIST OF ATTACHMENTSROTOR THEORY 138
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LIST OF ATTACHMENTSROTOR DESIGN TOO
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LIST OF ATTACHMENTSROTOR DESIGN TOO
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LIST OF ATTACHMENTSAIRFOIL With the
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LIST OF ATTACHMENTSAIRFOIL Complete
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LIST OF ATTACHMENTSSTRUCTURAL ANALY
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LIST OF ATTACHMENTSBLADE ATTACHMENT
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LIST OF ATTACHMENTSSTRUCTURAL VERIF
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LIST OF ATTACHMENTSTOWER ANALYSIS T
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LIST OF ATTACHMENTSFURLING AND YAW
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LIST OF ATTACHMENTSALTERNATIVE AIRF
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LIST OF ATTACHMENTSCOMPLIANCE WITH
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