design and implementation of thyristor switched shunt capacitors a ...

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Figure 4.25 Firing pulses and current waveforms of a back-to-back connected thyristor pair during steady-state. . . . . . . . . . . . . . . . 103 Figure 4.26 Resultant 3φ Capacitor Waveforms of the turn-off transient with thyristor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Figure 4.27 Single Line Diagram of the electrical network installed in BLI. 105 Figure 4.28 Single Line Diagram of the electrical network installed in YLI. 106 Figure 4.29 Voltage waveforms across the thyristor connected line-to-line when the thyristors are on and capacitors are initially discharged. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . . . 108 Figure 4.30 Voltage waveforms across the thyristor connected line-to-line when the thyristors are off and capacitors are initially charged. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . . . 109 Figure 4.31 Voltage waveforms across the thyristor connected line-to-line when the thyristors are on and capacitors are partially discharged. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . 110 Figure 4.32 Voltage waveforms across the capacitor when the thyristors are off. (a) Simulations Results, (b) Derived from Field Data. . . . . 111 Figure 4.33 Voltage waveforms across the capacitor when the thyristors are on and capacitors are initially charged. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . . . . . . . . . . . . . . . 112 Figure 4.34 Voltage waveforms across the capacitor when the thyristors are on and capacitors are initially discharged. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . . . . . . . . . . . . . . . . . 113 Figure 4.35 Current waveforms thorough the reactor and capacitor voltages when the thyristors are on and capacitors are initially discharged. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . . . 114 Figure 4.36 Current waveforms thorough the reactor and thyristor voltages when the thyristors are on and capacitors are partially discharged. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . . . 115 Figure 4.37 Current waveforms through the reactor during a misfire and their effects on the thyristor voltage. . . . . . . . . . . . . . . . . . . 116 xvi
Figure 4.38 3 Phase current waveforms thorough the reactor and thyristor voltages when the thyristors are off. (a) Simulations Results, (b) Derived from Field Data. . . . . . . . . . . . . . . . . . . . . . . . . 118 Figure 4.39 Harmonic spectrum of TSC current during transient for one cycle period, (a) Phase Current, (b) Line Current. . . . . . . . . . . 119 Figure 4.40 Reactive power compensation performance of TSC working in parallel to TCR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Figure 4.41 Picture of practical cabinet design of TSC. (a) View 1, (b) View 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Figure B.1 On-state power dissipation curve of the thyristor. . . . . . . . 134 Figure B.2 Stored charge and reverse recovery current curves of the thyristor.135 Figure B.3 Gate characteristics curve of the thyristor. . . . . . . . . . . 136 Figure C.1 P-CAD 2002 Schematic File of TSC Enabling Unit, part 1. . 138 Figure C.2 P-CAD 2002 Schematic File of TSC Enabling Unit, part 2. . 139 Figure C.3 P-CAD 2002 Schematic File of TSC Enabling Unit, part 3. . 140 Figure C.4 P-CAD 2002 Schematic File of TSC Enabling Unit, part 4. . 141 Figure C.5 P-CAD 2002 Schematic File of TSC Enabling Unit, part 5. . 142 Figure C.6 P-CAD 2002 Schematic File of TSC Enabling Unit, part 6. . 143 Figure C.7 P-CAD 2002 Schematic File of TSC Enabling Unit, part 7. . 144 Figure C.8 P-CAD 2002 Schematic File of TSC Enabling Unit, part 8. . 145 Figure C.9 P-CAD 2002 Schematic File of TSC Enabling Unit, part 9. . 146 Figure C.10P-CAD 2002 Schematic File of TSC Enabling Unit, part 10. 147 Figure D.1 General view of the simulation model of TSC in PSCAD/EMTDC V3.0.6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Figure D.2 The details of TSC thyristor cabinet in Figure D.1. . . . . . 150 Figure E.1 The details of TSC cabinet created by Microsoft Office Visio 2003. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 Figure E.2 3 dimensional plot of TSC cabinet drawn by AutoCAD 2007. 153 xvii
Page 1 and 2: DESIGN AND IMPLEMENTATION OF THYRIS
Page 3 and 4: I hereby declare that all informati
Page 5 and 6: ÖZ TRİSTÖR ANAHTARLAMALI ŞÖNT
Page 7 and 8: ACKNOWLEDGMENTS I would like to exp
Page 9 and 10: 2.3 Switching Performance of TSC .
Page 11 and 12: LIST OF TABLES TABLES Table 1.1 Cur
Page 13 and 14: Figure 2.9 (a) Equivalent circuit r
Page 15: Figure 4.8 Resultant line-to-line v
Page 19 and 20: CHAPTER 1 INTRODUCTION 1.1 Power Qu
Page 21 and 22: this disturbance since they do not
Page 23 and 24: driving algorithm and it has to wit
Page 25 and 26: how to improve the transient respon
Page 27 and 28: From the practical view, the less t
Page 29 and 30: CHAPTER 2 PROBLEM DEFINITION AND PR
Page 31 and 32: as switching devices instead of ant
Page 33 and 34: Directly Connected Clients 35 33 30
Page 35 and 36: 2.2.2 Harmonic Filtration A pure si
Page 37 and 38: components dramatically. The follow
Page 39 and 40: 20A 20A 15A 15A Line Current 10A Li
Page 41 and 42: VS RS XS VL Source Load IL Ic Compe
Page 43 and 44: a couple of cycles. However, at lea
Page 45 and 46: i + + VT - T1 T2 V + VC - L C Figur
Page 47 and 48: 2.15 shows that there are some comp
Page 49 and 50: waveform directly follows the sourc
Page 51 and 52: is known as copper loss of the tran
Page 53 and 54: components parallel to the thyristo
Page 55 and 56: Ls Coupling Transformer V TCR TSC L
Page 57 and 58: +1.0 Reactive Power, Q (pu) Inducti
Page 59 and 60: V V max V max = voltage limit I Cma
Page 61 and 62: power system. Voltage source conver
Page 63 and 64: timing of switching must be when th
Page 65 and 66: Table 3.1: Type of the excavators a
Page 67 and 68:
3.3 Selection Criterion of Capacito
Page 69 and 70:
minutes should be given to self-dis
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possible in order to achieve a tran
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advantage. It is not affected by th
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(a) (b) Figure 3.7: PSCAD model of
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this value is at least twice of the
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of the reverse recovery current and
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curve in its datasheet should be ta
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Figure 3.13: The current distributi
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stays in inductive or capacitive re
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”ENB A, ENB B and ENB C” are co
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3.7 Key Points in Design of TSC Cab
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chapter, some basic calculations to
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CHAPTER 4 EXPERIMENTAL RESULTS 4.1
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(a) Contactor Switched Plain Capaci
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ated capacitor current. This inrush
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current. Line-to-line voltage is al
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(a) Three phase current waveform at
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4.2.2 Contactor Switched Shunt Filt
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to high inrush current causes a con
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(a) Voltage Waveform across the cap
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Page 111 and 112:
This transient has also negligible
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(a) Three phase current waveform at
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Figure 4.17: Resultant 3φ Capacito
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Page 119 and 120:
Figure 4.21: Resultant line-to-line
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Figure 4.24: Firing pulses, voltage
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566 uF 2x6.0 MVA TM 34.5 kV 500 / 5
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Experimental results will be presen
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+1.6 +0.66 Thyristor Voltage (kV) -
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+1.5 +1.0 Capacitor Voltage (kV) +0
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+1.5 +1.0 Capacitor Voltage (kV) +0
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increase in current can be approxim
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would be given to the supply voltag
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250 1 cycle transient fft 200 I Pha
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4.4 TSC Cabinet Interior Equipment
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4.5 Discussion In contactor or thyr
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• Delta-connected TSC topology is
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[13] Tabandeh, M., Alavi, M.H., Mar
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[38] Bilgin, H.F., “Design and Im
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Since the roots of this equation ar
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APPENDIX B DISTINCTIVE CURVES OF TH
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135 Figure B.2: Stored charge and r
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APPENDIX C DETAILS OF THE CONTROL C
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139 Figure C.2: P-CAD 2002 Schemati
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Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
147 Figure C.10: P-CAD 2002 Schemat
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149 Figure D.1: General view of the
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APPENDIX E APPLICATION MODEL OF THE
Page 171 and 172:
153 Figure E.2: 3 dimensional plot
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155 Figure F.1: Installed SVC syste
Page 175 and 176:
157 Figure F.3: Installed SVC syste
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