PDF (Thesis) - Nottingham eTheses - University of Nottingham

More documents

Recommendations

Info

Abstract Advanced power electronics systems are increasingly being used for AC motor drives, due to their numerous advantages in terms of performance and flexibility. In a bid to improve system performance and reduce converter size, higher switching frequencies are being used; this however pushes switching frequencies harmonics into the MF band (300 kHz to 3 MHz) and possibly even into the HF band (3 MHz to 30 MHz). Interest in the research of the electromagnetic interference produced by power electronics and drives systems has therefore grown over the past few years. To study, reduce or even possibly eliminate any interaction with other appliances, suitable EMI filters need to be designed and implemented. Such a need for developing filtering devices requires accurate HF models for the polluting system to be developed. The focus of this thesis is on the characterization of a matrix converter induction motor drive for aerospace application from the point of view of EMI interference and on the design and implementation of suitable filtering systems. Concerns about Electro Mag- netic Interferences are particularly justified in the light of the fact that high reliability is sought after in such applications. Failures of aircrafts’ subsystems could have catas- trophic consequences, therefore strict standards [1] regulating environmental suscep- tibility, electromagnetic interference and mechanical testing; amongst others, of such subsystems, need to be adhered to. The main interest in this work lies in the electromagnetic regulations defining the allowable conducted emissions in the frequencies between 150 kHz and 30 MHz. Parasitic elements play a dominating role in the be- haviour of the system in this frequency range. The problem is that they are difficult to identify and model since they are not always directly associable to a specific compo- nent, therefore every possible path for the currents have to be considered. The first goal achieved by this work is to characterize the EMI signature of a matrix converter induction motor drive using common and differential mode measurements of the converter and motor impedances separately. Based only on these measurements the project aims to synthesize accurate HF models for the Induction Motor and the Ma- trix Converter in common and differential mode, without the need of deep level studies i
that may involve long Finite Elements (FE) simulations of the physical system charac- teristics. This thesis proposes two general novel HF models for Matrix Converters and Induction Motors that could also be applied in any other application or operating con- dition. These models are automatically tuned and optimized by a suitably developed Genetic Algorithm (GA) routine capable to match those models with real experimental measurements. The aforementioned will be then used in a detailed simulation of the whole drive system to validate the modelling procedure. Following this, a suitable EMI filter complying with the stated regulations on the basis of the developed modelling is implemented. This thesis reports the methodologies used for both input and output filter design, together with description and analysis of some issues encountered during the process. The EMI output filter has been physically set-up; the experimental procedure of its realization is reported in this work, including novel design choices and analysis at a device level. Different emissions measurement taken before and after the filter insertion are presented and discussed, showing the effectiveness of the implemented filtering system. ii
Page 1: EMI Filter Design for Matrix Conver
Page 5 and 6: CONTENTS 3.1 Introduction . . . . .
Page 7 and 8: CONTENTS B External DLL 118 B.1 C c
Page 9 and 10: LIST OF FIGURES 2.10 Measurement at
Page 11 and 12: LIST OF FIGURES 6.9 CM Conducted EM
Page 13 and 14: LIST OF FIGURES 8.18 Input CM and D
Page 15 and 16: LIST OF TABLES 7.9 Attenuation for
Page 17 and 18: CHAPTER 1: INTRODUCTION the receive
Page 19 and 20: CHAPTER 1: INTRODUCTION Abs. Magnit
Page 21 and 22: CHAPTER 1: INTRODUCTION Figure 1.5:
Page 23 and 24: CHAPTER 1: INTRODUCTION • Make th
Page 25 and 26: CHAPTER 1: INTRODUCTION Figure 1.10
Page 27 and 28: CHAPTER 1: INTRODUCTION the filters
Page 29 and 30: CHAPTER 1: INTRODUCTION experimenta
Page 31 and 32: CHAPTER 2 Experimental implementati
Page 33 and 34: CHAPTER 2: EXPERIMENTAL IMPLEMENTAT
Page 45 and 46: CHAPTER 3: HF MODELLING STRATEGY im
Page 47 and 48: CHAPTER 3: HF MODELLING STRATEGY ci
Page 49 and 50: CHAPTER 3: HF MODELLING STRATEGY Re
Page 51 and 52: CHAPTER 3: HF MODELLING STRATEGY De
Page 53 and 54:
CHAPTER 3: HF MODELLING STRATEGY C2
Page 55 and 56:
CHAPTER 4: MOTOR AND MATRIX CONVERT
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
5.1 Introduction CHAPTER 5 EMI Meas
Page 73 and 74:
CHAPTER 5: EMI MEASUREMENTS Level:
Page 75 and 76:
CHAPTER 5: EMI MEASUREMENTS will tr
Page 77 and 78:
CHAPTER 5: EMI MEASUREMENTS iA iB I
Page 79 and 80:
CHAPTER 5: EMI MEASUREMENTS I[dBµA
Page 81 and 82:
CHAPTER 5: EMI MEASUREMENTS Motor c
Page 83 and 84:
CHAPTER 5: EMI MEASUREMENTS I[dBµA
Page 85 and 86:
CHAPTER 5: EMI MEASUREMENTS CM Volt
Page 87 and 88:
CHAPTER 6: SIMULATIONS OF INPUT AND
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
78 Figure 6.7: Complete HF model Po
Page 95 and 96:
Page 97 and 98:
CHAPTER 7 Filter Design and realiza
Page 99 and 100:
CHAPTER 7: FILTER DESIGN AND REALIZ
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
CHAPTER 8 Filter realization and ex
Page 119 and 120:
CHAPTER 8: FILTER REALIZATION AND E
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
CHAPTER 9 Conclusions and Further w
Page 131 and 132:
APPENDIX A Scientific Publications
Page 133 and 134:
B.1 C code APPENDIX B External DLL
Page 135 and 136:
APPENDIX B: EXTERNAL DLL Tseq_Pulse
Page 137 and 138:
APPENDIX B: EXTERNAL DLL B.2 MAST c
Page 139 and 140:
References [1] RTCA Incorporated. R
Page 141 and 142:
REFERENCES nious drives. In Europea
Page 143:
REFERENCES [48] D.F. Knurek. Reduci
show all

PDF (Thesis) - Nottingham eTheses - University of Nottingham

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?