Predictive Control of Three Phase AC/DC Converters

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100 CHAPTER 6. EXPERIMENTAL STUDY (a) DPC-SVM (b) U DC i L P Q CSF-P-DPC VF-CSF-P-DPC Figure 6.10: Experimental step change of referenced DC voltage U DCref from 300 to 600 V. From the top: (a) referenced U DCref and measured U DC voltage (100 V/div), line voltage u La (200 V/div), line current i La (10 A/div), (b) referenced P ref and measured P active powers (1 kW/div), and referenced Q ref and measured Q reactive powers (1 kvar/div)
6.3. OPERATION WITH LOW SWITCHING FREQUENCY 101 6.3 Operation with Low Switching Frequency The same experimental investigations have been repeated with reduced switching frequency for selected control methods: DPC-SVM, CSF-P-DPC and VF-CSF- P-DPC, under conditions listed in Tab. 6.1 and Tab. 6.3. Control Method F sw F swAV F swMax F s T HD per cycle [kHz] [kHz] [kHz] [%] DPC-SVM fixed 2 2 2 4.2 CSF-P-DPC fixed 2 2 3 3.3 VF-CSF-P-DPC fixed 2 2 3 3.2 Table 6.3: Sampling and switching frequencies of tested control methods (a) (b) DPC-SVM (c) CSF-P-DPC VF-CSF-P-DPC Figure 6.11: Line current T HD factors and spectrum in DPC-SVM, CSF-P-DPC and VF-CSF-P-DPC: (a) T HD factor measured up to 2.5 kHz, (b) harmonics spectrum up to 2.5 kHz, (c) harmonics spectrum up to 12.5 kHz Figure 6.12 shows steady state operation. In all cases oscillations of active and reactive powers can be observed (Fig. 6.12 (b)), however its amplitude and period are lower in predictive methods. It corresponds to line current T HD factor.
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WARSAW UNIVERSITY OF TECHNOLOGY Fac
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Contents Contents i 1 Introduction
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CONTENTS iii List of Symbols and Ab
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Chapter 1 Introduction AC/DC Voltag
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Based Trajectory Based Deadbeat Con
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5 which properties are deteriorated
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Chapter 2 Voltage Source Converter
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(Sa=1, Sc=0) UP2 (Sa=1, UP1 Sb=1, S
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IL UL jωLIL UL jωLIL 2.2. MATHEMA
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ILα 1 sL+RSα - ULα 32IDC 1 sCUDC
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2.3. SUMMARY 15 2.3 Summary In this
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Iqref Idref ILq ILd ILq φ uLab UDC
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UDC Filter 20 CHAPTER 3. CONTROL ST
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Qref dP dQ uLab UDC Sabc 22 CHAPTER
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24 CHAPTER 3. CONTROL STRATEGIES FO
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Qref Pref uLab UDC Sabc 26 CHAPTER
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UDC Filter 28 CHAPTER 3. CONTROL ST
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ILq φ ωL 30 CHAPTER 3. CONTROL ST
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Lα 32 CHAPTER 3. CONTROL STRATEGIE
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Page 48 and 49:
Page 51 and 52:
Chapter 4 Predictive Direct Power C
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4.3. VARIABLE SWITCHING FREQUENCY P
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UPdqUDC Qref UDCSabc uLab iLab 4.3.
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UPdqUDC UDCSabc uLab iLab 4.4. CURR
Page 59 and 60: UPdqUDC Qref Pref UDCSabc uLab iLab
Page 61 and 62: 4.6. CONSTANT SWITCHING FREQUENCY P
Page 63 and 64: PP1 fq1 fq2 PP4 PP5 PP6 PP3 fp3 fp3
Page 65 and 66: Sb Sc Sa Sb Sa Sc Sb Sa 4.6. CONSTA
Page 67 and 68: fqi fpi Qref Sabc 4.6. CONSTANT SWI
Page 69 and 70: 4.7. VF BASED CSF - PREDICTIVE DIRE
Page 71 and 72: Qref fpi Sabc iLab 4.7. VF BASED CS
Page 73 and 74: 4.8. SIMULATION RESULTS 63 200 150
Page 77 and 78: 4.8. SIMULATION RESULTS 67 Mag (% o
Page 85 and 86: 4.9. SUMMARY 75 Control Method t se
Page 87 and 88: Chapter 5 Investigations of Control
Page 89 and 90: 5.1. ROBUSTNESS TO PARAMETERS MISMA
Page 91 and 92: Sabc UDC UPαβ UPαβ Lest Lest UP
Page 93 and 94: 5.4. LINE VOLTAGE DISTURBANCES 83 (
Page 95 and 96: 5.4. LINE VOLTAGE DISTURBANCES 85 (
Page 97 and 98: 5.4. LINE VOLTAGE DISTURBANCES 87 C
Page 99 and 100: Chapter 6 Experimental Study Experi
Page 101 and 102: 6.1. STEADY STATE OPERATION 91 (a)
Page 103 and 104: 6.1. STEADY STATE OPERATION 93 Cont
Page 105 and 106: 6.2. TRANSIENT OPERATION 95 (a) ST-
Page 107 and 108: 6.2. TRANSIENT OPERATION 97 (a) ST-
Page 109: 6.2. TRANSIENT OPERATION 99 (a) ST-
Page 113 and 114: 6.3. OPERATION WITH LOW SWITCHING F
Page 115 and 116: 6.3. OPERATION WITH LOW SWITCHING F
Page 117: 6.4. SUMMARY 107 Control Method t s
Page 120 and 121: 110 CHAPTER 7. SUMMARY AND FINAL CO
Page 122 and 123: 112 BIBLIOGRAPHY [11] K. Hyosung an
Page 124 and 125: 114 BIBLIOGRAPHY [38] A. Nasiri,
Page 126 and 127: 116 BIBLIOGRAPHY [66] F. Morel, J.
Page 128 and 129: 118 BIBLIOGRAPHY 13. A. Lopez de He
Page 131 and 132: Appendix A Coordinate transformatio
Page 133 and 134: q β A.2. ROTATING SYSTEM 123 A.2 R
Page 135 and 136: Appendix B Predictive Current Contr
Page 137 and 138: ∆ILαβP6 ∆ILαβP5 Figure B.2:
Page 139: Figure B.4: Vector diagram of predi
Page 142 and 143: 132 APPENDIX C. PREDICTIVE DIRECT P
Page 145 and 146: List of Symbols and Abbreviations S
Page 147 and 148: 137 Symbols Description Definition
Page 149 and 150: List of Figures 1.1 Conjunction bet
Page 151 and 152: LIST OF FIGURES 141 5.3 Line curren
Page 153: LIST OF TABLES 143 B.2 An example o
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Predictive Control of Three Phase AC/DC Converters

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