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

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Application and Verification 167 7.5 Executive summary for chapter 7 The general capabilities of the modulators introduced in the previous chapters are summarized and suitable topologies fitting the modulator schemes are listed. There is no single modulation scheme providing best performance regarding all criteria and in all operating points. In fact some of the modulation schemes nicely complement each other. A hysteresis control approach is proposed to make best use of all the available modulation schemes. The choice of modulators to be used within a hysteresis controller depends also on the application. Different basic applications are given and the suitability of the individual modulation schemes is evaluated. Experimental results show the functionality of those controllers. The limitations of some modulation schemes are also demonstrated. In a given operating point (reactive power at high modulation depth), unconstrained DC CM injection cannot control the NP, the NP voltage drifts away to the next threshold, where 6 th harmonic injection is applied. The voltage is brought back to the set point. When going to trapezoidal over modulation, the real time NP current scheme does not work anymore, the NP voltage rise until it hits the threshold and the virtual vectors bring the NP voltage back to its set point. The NP control performance is compared for the different modulation schemes in various operating points by applying a step function in the NP voltage reference. The resulting step response is a very good measure for the NP control capacity. The performance of all the modulators could be verified for the crucial operating points. The virtual vector sequences show best NP voltage control as expected for - reactive power at any modulation depth - low modulation depth at any load angle - high modulation depth at any load angle Seamless operation of all considered modulators is highly crucial for the application of a hysteresis controller. This is also demonstrated experimantelly and smooth transitions between different modulation schemes can be observed.
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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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x Résumé français (French summar
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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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NP Control with Carrier based PWM 8
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Page 217 and 218: 196 Bibliography [16] R. Marquardt,
Page 219 and 220: 198 Bibliography [48] K. Zhou and D
Page 221 and 222: 200 Bibliography [76] Q. Song, W. L
Page 223: 202 Bibliography [101] G. Gateau, T
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Christoph Haederli - Les thÃ¨ses en ligne de l'INP - Institut National ...

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