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

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Conclusions and Outlook 173 A more thorough analysis of the NP current as a function of the line harmonics would be of high interest. 6. For the case of online optimized PWM sequences, the concept of the HFT (harmonic flux trajectory) could be applied to get a true online WTHD optimization. This is of interest specifically for very low switching frequencies (or converters with a high number of levels) where PD PWM does not yield best performance anymore and typically optimized pulse patterns would be applied. 7. CM injection schemes could be combined with the CB PWM schemes making use of redundant states according to chapter 5.3. All possible NP current functions can be precalculated, exploring all possible combinations of different modulation types. The choice of modulation type may be based on any desired criteria.
174 Conclusions and Outlook 8.3 Summary of original contributions - A generic framework for ML representation, analysis and synthesis has been introduced. o It has been shown that most converters according to the state of the art fit in that framework o New 3-L DC link topologies have been invented based on that framework. - A large set of ML converters has been compared regarding a set of criteria including. o Switch requirements including scaling laws o Flying capacitor energy requirements including scaling laws - Properties of 3-L DC link topologies have been investigated. o Exploration of redundant states and introduction of the virtual vectors of the 5-L ANPC o NP current representation as a function of CM voltage and θ, giving insight to the NP current characteristics and supporting the definition of new control schemes - New modulation and control schemes have been introduced o Real-time NP current scheme and 6 th harmonic injection suitable for all 3-L DC link topologies including the NPC o Specific CB PWM schemes making use of redundant state for the ANPC 3 and the SMC with significant improvement of the NP current control capacity o Virtual vector sequence modulation for the ANPC 1 with significant improvement of the NP current control capacity Exploration of the range of existence of modified and virtual vectors o Online optimal sequence modulation allowing for reduced switching losses coupled with good output harmonic performance - Application of multiple schemes within hysteresis NP controllers - Performance comparison of the different modulation and control schemes
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THÈSE En vue de l'obtention du DOC
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Acknowledgements i ACKNOWLEDGEMENTS
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iv Table of Contents 3.4 Generic ML
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vi Table of Contents 7.1 General mo
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viii Résumé français (French sum
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xviii Résumé français (French su
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Introduction 1 2 INTRODUCTION This
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Introduction 3 tighter capacitor di
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Introduction 5 TABLE 1, OPERATING R
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Introduction 7 2.3 Glossary Note th
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Introduction 9 2.4 Nomenclature Not
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Introduction 11 DPC DSP DTC FC FPGA
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ML Converter Topologies 13 3 ML CON
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ML Converter Topologies 15 The four
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ML Converter Topologies 17 Each swi
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ML Converter Topologies 19 size doe
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ML Converter Topologies 21 plus (a)
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ML Converter Topologies 23 N >= 2,
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ML Converter Topologies 25 (a) (b)
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ML Converter Topologies 27 (a) (b)
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ML Converter Topologies 29 In a pra
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ML Converter Topologies 31 reality,
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ML Converter Topologies 33 All cons
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ML Converter Topologies 35 TABLE 16
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ML Converter Topologies 37 TABLE 17
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ML Converter Topologies 39 3.7.4.1
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ML Converter Topologies 41 f C sw =
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ML Converter Topologies 43 A second
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ML Converter Topologies 45 Limitati
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ML Converter Topologies 47 1 K M 2
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ML Converter Topologies 49 3.8 Exec
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52 3-L DC Link ML Converter Propert
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Page 218 and 219: Bibliography 197 [33] P. Steimer,
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Page 222 and 223: Bibliography 201 [88] J. Pou, J. Za
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