Testing Small Wind Turbine Generators - Renewable and ...

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instantaneous shaft position, a digital signal processor determines which motor phases toactivate, and signals the power electronics package accordingly.Figure 2.1. Subsystems comprising the driving dynamometer.Figure 2.2 shows the entire system, as set up in the student laboratory. While the testarea is cluttered due to the limited bench space in the student laboratory, all the majorsubsystems are visible and labeled.2.2 Mounting StructureThe first system needed to begin development of the dynamometer is a mouting structure:a platform to which the motor and generator can be bolted securely. The structure isrequired to handle the high static loads present during high-torque operation as well as thevibrations characteristic of high-speed operation. It must also be flexible in terms of designand construction: the dynamometer may have to be disassembled and moved, it may needto be redesigned for improved functionality, and it may be used to test different generatorswith different (and as yet unknown) dimensions.7
Figure 2.2. Completed driving dynamometer, labeled to show main subsystems.2.2.1 Building SystemTwo building systems were found to possess the required combination of strength, easeof construction, and ease of redesign. The first, “80/20,” consists of extruded aluminumbeams and a wide range of fasteners, connectors, and accessories. One key feature of thisbuilding system is the fact that connectors can be affixed to any side of a given aluminumbeam, providing maximum flexibility for design and redesign. On the other hand, the 80/20building system often requires drilling to allow the attachment of fasteners. This systemwas also found to cost significantly more than the alternative.The second building system considered, “Unistrut,” is based on extruded steel beamsand related fasteners, connecting brackets, and accessories. Unlike 80/20, unistrut beams8
Page 1 and 2: Testing Small Wind Turbine Generato
Page 3 and 4: Testing Small Wind Turbine Generato
Page 5: “And now,” cried Max, “let th
Page 8 and 9: 2.5 Control System . . . . . . . .
Page 11 and 12: List of Figures1.1 California Energ
Page 13 and 14: List of Tables2.1 Phase names and a
Page 16 and 17: Chapter 1IntroductionHorizontal boo
Page 18 and 19: Figure 1.1. California Energy and P
Page 20 and 21: Chapter 2System DesignI had investe
Page 24 and 25: consist of only one deep channel, s
Page 26 and 27: Figure 2.4. One of two roller platf
Page 28 and 29: 1/2”. The next has an inside diam
Page 30 and 31: Motor ConnectionsPhase Name DC Posi
Page 32 and 33: Figure 2.10. Active motor phases fo
Page 34 and 35: meet these requirements are ON Semi
Page 36 and 37: and to ground. This current flow al
Page 38 and 39: Figure 2.17. Assembled control circ
Page 40 and 41: indefinitely to continuously keep t
Page 42 and 43: difference is divided by the one se
Page 44 and 45: is independent from the main DC pow
Page 46 and 47: 2.6.2 Electrical SystemTo load the
Page 48 and 49: Figure 2.23. Complete dump load, in
Page 50 and 51: Chapter 3TestingThe perception of e
Page 52 and 53: 1. Begin with no dump load resistor
Page 54 and 55: The dynamometer frame was slightly
Page 56: to address this problem.While a sol
Page 59 and 60: 4.1 OverviewOnce testing has been p
Page 61 and 62: is the same for all phases: R P = 0
Page 63 and 64: Curve Number Basis Equation1 T F =
Page 65 and 66: Figure 4.5. Difference between mode
Page 67 and 68: elated to the DC output voltage by
Page 69 and 70: T T = 1 (√ω 3VLM I M − I 2 )M
Page 71 and 72: The resultant model is then checked
Page 73 and 74:
Table 4.3 shows the final generator
Page 75 and 76:
Efficiency EquationLastly, the gene
Page 77 and 78:
Figure 4.8. Generator line voltage:
Page 79 and 80:
more bits of information: the rated
Page 82 and 83:
Chapter 5Summary and ConclusionsThi
Page 84 and 85:
Dynamometer1. The dynamometer is a
Page 86:
BibliographyLieu, P. D. K., Design
Page 89 and 90:
Figure A.1. Primary transistor spec
Page 91 and 92:
Figure A.3. Quadrature optical enco
Page 93 and 94:
Figure A.5. Digital signal processo
Page 95 and 96:
Figure A.7. Three-phase bridge rect
Page 97 and 98:
Figure A.9. Operational amplifier s
Page 99 and 100:
Figure B.1. Dynamic C code, page 1
Page 101 and 102:
Page 103 and 104:
Page 106 and 107:
Appendix CRaw Test DataFigure C.1.
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