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

More documents

Recommendations

Info

Application and Verification 149 7 APPLICATION AND VERIFICATION This chapter relates the proposed modulation schemes to the different operating conditions regarding modulation depth and load angle as required by different applications (see also paragraph 2.2). A few specifc applications are discussed in the context of the suitablitiy of the modulation schemes proposed in this thesis. Three ML topologies have high performance modulation schemes available and are suitable for all considered operating conditions. These are the ANPC 1, the ANPC 3, and the SMC. Hysteresis controllers making use of multiple modulation schemes had already been introduced for the ANPC3 and the SMC in chapter 1. This chapter introduces hysteresis controllers for the ANPC1. The experimental verification in this chapter includes a comparison of the NP control capacity for various modulation schemes and it demonstrates the performance of the proposed hysteresis controller. 7.1 General modulator capabilities TABLE 61 to TABLE 63 state important features of the modulators considered in this thesis. They form a basis for the choice of a suitable modulation and control scheme for a given application. The unconstrained DC CM injection control is very robust (except for reactive power operation) as it does not depend on current measurements and does not limit the CM. It can therefore provide always the highest NP current in case the NP current function is monotonic. All other schemes are sensitive to current measurement errors and delays in the control loop. Especially 6 th harmonic injection an real time NP current function scheme require a low delay in the control loop to make sure the calculated limits for the CM do not reduce the range of controllable NP current. Modified and virtual vector sequence schemes are less sensitive as the current values are only required to determine the best choice of vector sequence to be applied. However, also the second best choice will lead to a very powerful control of the NP current. 6 th harmonic injection and direct application of the real time NP current function are equivalent for pure reactive power and high modulation depth. They outperform the simple proportional feedback controller by far and are equivalent to optimized SVM schemes proposed in literature. The 6 th harmonic scheme is to be favored whenever losses are important and CM voltage needs to be minimized. This scheme has much less CM jumps in steady state than the general schemes based on the real time NP current function. The last proposed modulator calculating an optimal sequence with predictive methods relies very much on good real time values. Unfortunately, this is also the scheme requiring the longest calculation time. This can lead to a significant degradation of the control concept. It is therefore advisable to implement this scheme in hardware on a PLD ( e.g. FPGA) to keep calculation times as low as possible.
150 Application and Verification TABLE 61, SUITABILITY OF THE DIFFERENT NP CONTROL SCHEMES FOR VARIOUS OPERATING POINTS m < 0.1 0.1 < m < 0.9 m > 0.9 cos(ϕ) < cos(ϕ) > cos(ϕ) < cos(ϕ) > cos(ϕ) < cos(ϕ) > 0.15 0.15 0.15 0.15 0.15 0.15 Unconstrained DC CM injection, reference case Very Poor Medium Poor Good Very Poor Medium (Note 1) Real time NP current function Poor Medium Good Good Poor Medium 6 th harmonic n.a. n.a. Good (for m > 0.5) n.a. Poor n.a. Excellent Excellent Modified vectors Excellent Excellent (for m < (for m < n.a. n.a. 0.5) 0.5) Excellent Excellent Virtual vectors 1 n.a. n.a. (for m < (for m < n.a. n.a. 0.75) 0.75) Virtual vectors 2 n.a. n.a. Excellent Excellent Excellent (Note 2) Excellent (Note 2) Optimal sequence Good Good Good Good Poor Poor ANPC 3 PWM Excellent Excellent Excellent Excellent Excellent Excellent SMC A / B / FC Excellent Excellent Excellent Excellent Excellent Excellent Note 1: The performance degrades in the very high modulation depth (including over modulation) Note 2: Virtual vectors 2 can control the NP current up to very high modulation depths including pure trapezoidal modulation
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:
Page 110 and 111:
NP Control with Carrier based PWM 8
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
Page 118 and 119:
Page 120 and 121: NP Control with Carrier based PWM 9
Page 144 and 145: NP Control with Optimal Sequence SV
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 ...

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

Delete template?

Save as template?