Testing Small Wind Turbine Generators - Renewable and ...

More documents

Recommendations

Info

is independent from the main DC power supplies, and also powers the op-amp chips thatfunction as voltage followers. The encoder specifications sheet is provided in Appendix A,Figures A.3 and A.4.2.5.8 Digital Signal Processor PropertiesThe digital signal processor is part of a Rabbit Semiconductor RCM4100 RabitCoreDevelopment Kit. It was selected because it is the least expensive product found to containboth the functionality needed for this project, and the standard functionality that wouldbe helpful for future DSP-based projects undertaken at RAEL. These capabilities include aquadrature decoder, digital inputs and outputs, analog inputs, and pulse-width modulators.The DSP runs the control program provided in Appendix B, and communicates to the restof the system though a set of input and output pins. These I/O pins and their specific usesare listed in Table 2.2. The DSPs specifications are provided in Appendix A, Figures A.5and A.6.2.6 Dump LoadIn order to fully characterize the performance of a generator, it is necessary to vary bothits speed and the electrical load it powers. Once the motor is up and running, changingthe generator speed is a simple matter of changing the voltage input to the motor.Tovary the electrical load on the generator, it is necessary to develop a variable resistive loadcompatible with the generators three phase output.2.6.1 ResistorsThe dump load is designed to utilize power resistors already available in RAEL. Theseresistors can each dissipate up to 300 watts of power, and come in three resistances: 1.2 Ω,8 Ω, and 15 Ω. By combining these resistances in different series and parallel arrangements,it is possible to create loads between 1.2 Ω and 46 Ω that can dissipate up to 1.5 kW.29
Pin Name Use Pin Name Use+3.3VGNDRST OUTIORDIOWRRST INVBAT EXTPA0PA1 Digital output - PNP PA2PA3 Digital output - PNP PA4PA5 Digital output - PNP PA6PA7PB0PB1 Digital output - NPN PB2PB3 Digital output - NPN PB4PB5 Pin broken PB6PB7 Digital output - NPN PC0PC1PC2PC3PC4PC5PC6PC7 PE0 Encoder output APE1 Encoder output B PE2PE3PE4PE5PE6PE7PN0 LN0PN1 LN1PN2 LN2PN3 LN3PN4 LN4PD5 LN5PD6 LN6PD7 LN7CVTVREF System ground AGNDTable 2.2. DSP pins and their uses.30
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 22 and 23: instantaneous shaft position, a dig
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 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.
show all

Testing Small Wind Turbine Generators - Renewable and ...

Create successful ePaper yourself

Delete template?

Save as template?