Christoph Haederli - Les thèses en ligne de l'INP - Institut National ...

iv
Table of Contents
3.4 Generic ML VSC framework 18
3.5 State of the art ML topologies 20
3.5.1 SMC (Stacked Multi Cell Converter) 20
3.5.2 Multi level active neutral point clamped converter ML ANPC 21
3.5.3 Modular multi level converter M 2 LC 23
3.5.4 Other previously published topologies 24
3.6 Novel 5-L Topologies 26
3.6.1 Operation of the ANPC 1 variation with backward half bridge 28
3.7 Topology comparison 29
3.7.1 Operating range and number of devices 30
3.7.2 Parallel paths, current loading of switches and semiconductor losses 33
3.7.3 Modularity and Scalability 36
3.7.4 Flying capacitor energy 38
3.7.5 Conclusion for MC based topologies 45
3.7.6 Comparison with M 2 LC 46
3.8 Executive summary for chapter 3 49
4 3-L DC LINK ML CONVERTER PROPERTIES 51
4.1 General converter properties 51
4.1.1 Some definitions 52
4.2 Converter states 54
4.2.1 5-L ANPC 1 converter states 55
4.3 Space vector representation 56
4.3.1 Redundant states of the 5-L ANPC 1 58
4.4 Modulation 59
4.4.1 CB PWM 59
4.4.2 SVM 60
4.4.3 Modulation by choice of “next best vector” 60
4.4.4 Selective harmonic control 61
4.4.5 General comments on ML modulation 61
4.4.6 Modulator implementation and experimental verification 63
4.5 Introduction to NP and FC control in 3-L DC link converters 65
4.5.1 Sources of NP current 65
4.5.2 NP control 65
4.5.3 FC control 66
4.5.4 Interaction of NP and FC control 67
4.5.5 Natural balancing 67
4.6 NP current in function of output voltage in single phase legs 68
4.6.1 NP current in the NPC 68
4.6.2 NP current in the 3-L ANPC 68
4.6.3 NP current in the ML ANPC 69
4.6.4 SMC 70