hvdc plus - · pdf filepower transmission and distribution ev-h2_01.98- 2 (9 +$ 6k 96&7 k...
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Power Transmission and Distribution EV-H2_01.98- 1
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
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Power Transmission and Distribution EV-H2_01.98- 2
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Voltage Source ConverterTwo Level VSC (Phase Module)
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–
+
–
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Vd
2
Vd
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Vd
2
+
–
Vd
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VacVac
Power Transmission and Distribution EV-H2_01.98- 3
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Voltage Source ConverterThree Level VSC (Phase Module)
–
+
MM
+
–
–
+
M
ϑ
Vd
2
Vd
2
Vd
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Vd
2Vac Vac
Power Transmission and Distribution EV-H2_01.98- 4
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Voltage Source ConverterTwo Level VSC (Phase Module)
+
–
+
–
ϑ
Vd
2
Vd
2
Vd
2
+
–
Vd
2
VacVac
Power Transmission and Distribution EV-H2_01.98- 5
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Voltage Source ConverterThree Level VSC (Phase Module)
–
+
MM
+
–
–
+
M
ϑ
Vd
2
Vd
2
Vd
2
Vd
2Vac Vac
Power Transmission and Distribution EV-H2_01.98- 6
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve Technology2-Level versus 3-Level Converter (I)
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Harmonics (THD) 100 % approx. 50 %
du/dt 100 % 50 %
������Valve Modules 1 type 3 different types
(extern, intern, mid-point)
Construction compact less compact(mid-point clamping)
��� � VSC standard special control algorithms(mid-point potential)
Power Transmission and Distribution EV-H2_01.98- 7
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve Technology2-Level versus 3-Level Converter (II)
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Power Transmission and Distribution EV-H2_01.98- 8
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Siemens Valve TechnologyIGBT Converter - Protection
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Special control algorithms
DC Chopper
Discharging device and converter trip
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Special control algorithms
Peak current controlusing high transientswitching frequency (>1 kHz)
Converter trip
Power Transmission and Distribution EV-H2_01.98- 9
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
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−
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Special control algorithms
DC Chopper
Discharging device and converter trip
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Special control algorithms
Peak current controlusing high transientswitching frequency (1 kHz)
Converter trip
Siemens VSC TechnologyHD GTO Converter Protection
Power Transmission and Distribution EV-H2_01.98- 10
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
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VDRM 4500 V ITQRM 4000 A
# ����������
vmax 2800 Vripple*) imax 3000 Apeak
Vmax 2500 Vaverage *) Imax(ph) 2000 ARMS **)
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*) depends on number of series connected GTOs**) depends on switching frequency
Siemens VSC TechnologyHD GTO
Power Transmission and Distribution EV-H2_01.98- 11
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
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VDRM 4500 V(6500 V)
# ����������
vmax 2800 Vripple imax n.a.(3360 Vripple)
Vmax 2500 Vaverage Imax(ph) 800 ARMS *)(3000 Vaverage)
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*) switching frequency 750 Hz (1000 Hz)
Siemens VSC TechnologyIGBT
ITQRM ~3000 A
Power Transmission and Distribution EV-H2_01.98- 12
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
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* ������$ �������++�*,�-.�����* ������$ �������++�*,�-.�����
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No of GTOs nGTO 14 + 2
Voltage Vvalve 35 kV average
Current Iph 1800 ARMS
Switching frequency fs 300 Hz cont.1000 Hz 1s
Siemens VSC TechnologyHD GTO Module
Power Transmission and Distribution EV-H2_01.98- 13
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
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No of IGBTs nIGBT ≤ 25 (3level)≤ 50 (2level)
Voltage Vvalve 70 kV average140 kV average
Current Iph 800 ARMS
Switching frequency fs 600 Hz cont.1000 Hz 1s
Siemens VSC TechnologyPPI Module
Power Transmission and Distribution EV-H2_01.98- 14
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
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L1L2L3
+
0
−
+
0
−
L
ϑ
Vd /2
-Vd /2
Vd /2
Vd /2
C
C
Vd av 50 kV
amax ≥ 0.95
Iac(1) 2000 A
Sconv 100 MVA
C 2 mF
fPWM 300 Hz
Iac(1)
Conv. VoltageRatio
Siemens VSC TechnologyHD GTO Converter
Power Transmission and Distribution EV-H2_01.98- 15
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve TechnologyIGBT Element 4.5 kV, 750 A DC
Power Transmission and Distribution EV-H2_01.98- 16
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve TechnologyIGBT Element 4.5 kV, 750 A DC
Power Transmission and Distribution EV-H2_01.98- 17
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve TechnologyIGBT Element 4.5 kV, 750 A DC
Power Transmission and Distribution EV-H2_01.98- 18
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve TechnologyTurn-on waveform of Series Connected IGBTs
Power Transmission and Distribution EV-H2_01.98- 19
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve TechnologyTurn-off waveform of Series Connected IGBTs
Power Transmission and Distribution EV-H2_01.98- 20
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
Valve TechnologyShort-Circuit Behavior of IGBTs
Power Transmission and Distribution EV-H2_01.98- 21
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
gradingcircuit
gradingcircuit
gradingcircuit
gradingcircuit
Fibre Optics Interface
Valve Control & Protection
Main Control
GU GU GU GU
Valve TechnologySeries Connection of IGBT
Power Transmission and Distribution EV-H2_01.98- 22
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
• Capability of IGBTs to limit and turn-off Short Circuit Currents
� Protection of IGBTs
• External freewheeling Diodes with high I2t-Value � Protection of Diodes at external Failures � no Break of Semiconductor Housings at worst case
Failures � superior Performance of fast Diodes compared
to reverse conducting IGBT
• Advanced Gate Unit � improved Switching Performance of IGBT � Overvoltage Protection of IGBT � Current Limiting Circuits
Valve TechnologyMain Design Features of Converters (1)
Power Transmission and Distribution EV-H2_01.98- 23
(9 +$ ���6 K �� �� ���� 96&7 K O
HVDC PLUSPower Link Universal Systems
• Selection of Components under Condition of minimal Losses
• Design for low Cosmic Ray Sensitivity
• Fast Detection of Failures
• Modular Structure of Converters
• redundant IGBT Levels in each Valve
• Efficient, reliable and corrosion-free Cooling
• System designed for little and easy Maintenance
• Use of well-proven Components and Materials of HVDC Valves � high Fire Resistance, Reliability and Seismic Robustness
Valve TechnologyMain Design Features of Converters (2)