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Application and Verification 165 TABLE 74, PERFORMANCE OF THE INDIVIDUAL NP CONTROL SCHEMES AT REACTIVE POWER OPERATION AND HIGH MODULATION DEPTH Simulation (TABLE 40): Simulation (TABLE 40): Measurement: Measurement: (a) Real time current function, m=0.9 (b) 6 th harmonic injection, m=0.9 (c) Virtual vectors, m=0.9 (d) Virtual vectors, m= 1.15 (full trapezoidal modulation) Legend: CH1 (yellow): U out1, CH2 (cyan): U out2, CH3 (magenta): U NP, CH4 (green): I out2, MATH (red): U out1-2, 25ms/div 7.4.1.3 Distorted load, harmonic compensation An important aspect of distorted and unbalanced systems is the generation of DC NP currents and NP current harmonics. As can be seen from TABLE 27 and TABLE 28, the relationship between line currents, switching function, and resulting NP current is quite complex. It can be assumed that in heavily distorted system, the NP current is practically unpredictable and it possibly contains a significant DC component. A good NP control scheme is therefore required especially in such rough operating conditions. The 6 th harmonic injection scheme relies on relatively balanced currents. The concept does not work properly anymore if the currents are heavily unbalanced or contain a DC component. The real time NP current scheme does not make use of any three phase information like load angle, or transformed dq (direct-quadrature) values. It is using the instantaneous current values and applies a CM function totally independent from past and future of the load current. Therefore, the controller still operates reliably with unbalance or distorted load currents, provided the controller has a bandwidth high enough cope with the dynamics in the disturbed system. The same statements as for the real time NP current scheme apply to the virtual vector modulation schemes. The most
166 Application and Verification suitable sequence is chosen in every modulation cycle based on the instantaneous currents. The controller maintains its superior performance also for heavily unbalanced or distorted currents. As a consequence, the 6 th harmonic injection scheme is best applied within a hysteresis controller including also the real time NP current scheme or the virtual vector scheme, to make sure the system performs as it should also under unbalanced and distorted conditions.
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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 172 and 173: Application and Verification 151 TA
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Page 191 and 192: 170 Conclusions and Outlook 8.1.2 M
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Page 195 and 196: 174 Conclusions and Outlook 8.3 Sum
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Page 199 and 200: 178 Appendix TABLE 78, FLYING CAPAC
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Page 203 and 204: 182 Appendix 9.4 States of the ANPC
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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
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