Christoph Haederli - Les thÃ¨ses en ligne de l'INP - Institut National ...

More documents

Recommendations

Info

NP Control with Optimal Sequence SVM 137 (a) (b) CH1 (yellow): U out1 CH2 (cyan): U out2 CH3 (magenta): U NP CH4 (green): I out2 MATH (red): U out1-2 Figure 98, NP current ripple for real time NP current scheme (a) and virtual vector scheme (b) at medium modulation depth (m=0.75) Figure 98 shows the impact of the modulation scheme on the minimum NP voltage ripple. The virtual vector scheme can significantly reduce the NP voltage ripple at the cost of increased losses and increased output voltage distortion.
138 NP Control with Optimal Sequence SVM 6.2 Online calculated optimal sequences by the use of optimal control schemes When considering NP and FC control, all required quantities can be controlled separately, as has been done with previously proposed control schemes: Output voltage (for torque, flux, power or voltage control) can be set in open loop by the appropriate αβ vector (and feed forward control taking into account actual DC voltages); flying capacitors can be controlled by the appropriate share of redundant states; the NP can be controlled with the application of a CM and suitable choice of redundant states. Alternatively, all parameters can be controlled at the same time, applying an optimal control scheme. This chapter introduces an approach to optimized SVM by means of optimal control for the generation of sequences of converter states to be applied. This is related to the work by Geyer/Papafotiou/Morari [51, 52] or J. Rodriguez et al. [54, 57], who use MPC (model predictive control) to implement modulators integrating control of internal and external quantities. Those published concepts act directly on the individual switching states, resulting in a “next best vector” type of modulation (see 4.4.3) and variable frequency operation. In contrast, the method proposed in this chapter uses model based prediction and optimal control but applies those concepts on a number of generic sequences rather than next optimal vectors. As a result, the operation of the converter is much closer to classic CB PWM or SVM with constant switching frequency with the notable difference that multiple quantities are controlled at the same time. Due to the large number of available states in ML converters, any sequence based on SVM can be generated in a large number of different ways. To start with, the length of a SVM sequence is not inherently given. A minimum of three discrete vectors is required to approximate any continuous space vector in αβ0. However, more vectors are possible. It has been shown that CSPD PWM results in optimized harmonic performance for ML converters [35]. Such a modulator results in 7 states over one full period of the carrier. If there are two samples per carrier period, there are still 4 vectors to be applied per sampling period. Apart from the degree of freedom in choosing a certain type of sequence, there is also the degree of freedom in choosing redundant states within a given sequence frame. For the choice of redundant states there are many constraints and optimization criteria, which can be applied. Constraints: TABLE 53, CONSTRAINTS AND OPTIMIZATION CRITERIA FOR OPTIMAL SEQUENCE SVM - DM voltages according to carrier based modulation, nearest three vector approach or any other alternate method for calculation of output level and application time - NP and FC to be controlled within certain bounds Optimization criteria may include: - Switching losses minimization - Output harmonics minimization - CM voltage minimization
Page 1 and 2:
THÈSE En vue de l'obtention du DOC
Page 3:
Acknowledgements i ACKNOWLEDGEMENTS
Page 6 and 7:
iv Table of Contents 3.4 Generic ML
Page 8 and 9:
vi Table of Contents 7.1 General mo
Page 10 and 11:
viii Résumé français (French sum
Page 12 and 13:
x Résumé français (French summar
Page 14 and 15:
xii Résumé français (French summ
Page 16 and 17:
xiv Résumé français (French summ
Page 18 and 19:
xvi Résumé français (French summ
Page 20 and 21:
xviii Résumé français (French su
Page 22 and 23:
Introduction 1 2 INTRODUCTION This
Page 24 and 25:
Introduction 3 tighter capacitor di
Page 26 and 27:
Introduction 5 TABLE 1, OPERATING R
Page 28 and 29:
Introduction 7 2.3 Glossary Note th
Page 30 and 31:
Introduction 9 2.4 Nomenclature Not
Page 32 and 33:
Introduction 11 DPC DSP DTC FC FPGA
Page 34 and 35:
ML Converter Topologies 13 3 ML CON
Page 36 and 37:
ML Converter Topologies 15 The four
Page 38 and 39:
ML Converter Topologies 17 Each swi
Page 40 and 41:
ML Converter Topologies 19 size doe
Page 42 and 43:
ML Converter Topologies 21 plus (a)
Page 44 and 45:
ML Converter Topologies 23 N >= 2,
Page 46 and 47:
ML Converter Topologies 25 (a) (b)
Page 48 and 49:
ML Converter Topologies 27 (a) (b)
Page 50 and 51:
ML Converter Topologies 29 In a pra
Page 52 and 53:
ML Converter Topologies 31 reality,
Page 54 and 55:
ML Converter Topologies 33 All cons
Page 56 and 57:
ML Converter Topologies 35 TABLE 16
Page 58 and 59:
ML Converter Topologies 37 TABLE 17
Page 60 and 61:
ML Converter Topologies 39 3.7.4.1
Page 62 and 63:
ML Converter Topologies 41 f C sw =
Page 64 and 65:
ML Converter Topologies 43 A second
Page 66 and 67:
ML Converter Topologies 45 Limitati
Page 68 and 69:
ML Converter Topologies 47 1 K M 2
Page 70:
ML Converter Topologies 49 3.8 Exec
Page 73 and 74:
52 3-L DC Link ML Converter Propert
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108: 86 3-L DC Link ML Converter Propert
Page 110 and 111: NP Control with Carrier based PWM 8
Page 144 and 145: NP Control with Optimal Sequence SV
Page 170 and 171: Application and Verification 149 7
Page 172 and 173: Application and Verification 151 TA
Page 174 and 175: Application and Verification 153 Th
Page 176 and 177: Application and Verification 155 7.
Page 188: Application and Verification 167 7.
Page 191 and 192: 170 Conclusions and Outlook 8.1.2 M
Page 193 and 194: 172 Conclusions and Outlook 8.2 Out
Page 195 and 196: 174 Conclusions and Outlook 8.3 Sum
Page 197 and 198: 176 Appendix I = 1− ) (99) ( C 2
Page 199 and 200: 178 Appendix TABLE 78, FLYING CAPAC
Page 201 and 202: 180 Appendix 9.3 Single phase NP cu
Page 203 and 204: 182 Appendix 9.4 States of the ANPC
Page 205 and 206: 184 Appendix 9.5 NP currents as a f
Page 207 and 208: 186 Appendix 9.5.3 Maximum and mini
Page 209 and 210:
188 Appendix 9.6 NP current functio
Page 211 and 212:
190 Appendix TABLE 91, NP CURRENT I
Page 213 and 214:
192 Appendix TABLE 93, NP CURRENT I
Page 216 and 217:
Bibliography 195 10 BIBLIOGRAPHY [1
Page 218 and 219:
Bibliography 197 [33] P. Steimer,
Page 220 and 221:
Bibliography 199 neutral point bala
Page 222 and 223:
Bibliography 201 [88] J. Pou, J. Za
show all

Christoph Haederli - Les thÃ¨ses en ligne de l'INP - Institut National ...

Create successful ePaper yourself

Delete template?

Save as template?