Transcript High Power Converters and Applications

EE8407
Power Converter Systems
Topic 8
Graduate Course EE8407
Bin Wu
PhD, PEng
Professor
ELCE Department
Ryerson University
Contact Info
Office: ENG328
Tel:
(416) 979-5000 ext: 6484
Email:
[email protected]
http://www.ee.ryerson.ca/~bwu/
Ryerson Campus
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Topic 8
Topic 8
Other Multilevel Voltage Source Converters
Five-Level NPC/H-Bridge Inverter System with dual 18-pulse rectifier
LEDAR, Ryerson University
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Topic 8
Other Multilevel
Voltage Source Converters
Lecture Topics
• NPC/H-Bridge Inverters
• Flying-Capacitor Inverters
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Topic 8
NPC/H-Bridge Inverters
• Five-Level Topology
Motor
A
C
B
S11
S 21
E
Cd
Vd 1
E
S12
S 22
S13
S 23
v AN
v BN
Vd 2
vCN
Vd 3
Cd
S 24
S14
Phase A
Phase B
N
Phase C
Compared with three-level NPC Topology:
- Voltage levels increases from three to five
- Inverter output voltage and power are doubled
- Device count is doubled
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Topic 8
NPC/H-Bridge Inverters
• IPD Modulation
v cr 1
0
vcr 2
vm1
Vˆm
vm 2
Vˆcr

2
v g 11
v g 14
v g 21
v g 24
v AN
0
2E

2
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Topic 8
NPC/H-Bridge Inverters
• Waveforms and FFT (Five Level)
v AN (V )
v AB (V )
4000
8000
2E
2000
0
3
2

-2000
4000
4E
0

3
2
-4000
-4000
-8000
(a) Waveform
V AN n
2m f
Vd
1
2m f
(a) Waveform
V AB n
1
THD=33.1%
2m f
Vd
0.15
0.08
2m f
5
2m f
5
4m f
1
2m f
0.10
1
2m f
5
1
2m f
THD=28.4%
5
4m f
1
0.04
0.05
0
1
10
20
30
40
50
60
70
80
(b) Spectrum
Inverter Phase Voltage
n
0
1
10
20
30
40
50
60
70
80
n
(b) Spectrum
Line-to-line Voltage
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
NPC/H-Bridge Inverters
Topic 8
• Waveforms and FFT (Five Level)
V AB n
Vd
1.224
1.2
1
0.8
n 1
0.6
0.4
n  2m f  1
2m f  5
2m f  7
0.2
0
0
0.2
0.4
0.6
0.8
ma
Frequency modulation index: mf = 18
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Multilevel Flying Capacitor Inverters
Topic 8
• Five Level Topology
P
S1
S2
E
S3
Complementary
S4
Switch pairs:
E
Vd
E
E
B
A
(4 E )
S1 and S’1;
S 4
S2 and S’2;
S 3
S3 and S’3;
E
E
C
S 2
S1
S4 and S’4;
N
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Multilevel Flying Capacitor Inverters
Topic 8
• Switching State (five-level)
Output Voltage
V AN
4E
3E
2E
1E
0
Switching State
S1
S2
1
1
0
1
1
1
0
1
0
1
0
1
0
0
0
0
1
1
1
0
1
1
0
0
1
0
1
0
1
0
0
0
S3
1
1
1
1
0
0
1
0
1
1
0
0
0
1
0
0
S4
1
0
1
1
1
0
1
1
0
0
1
0
0
0
1
0
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Multilevel Flying Capacitor Inverters
Topic 8
• Phase-Shifted PWM
v AN
4E
0
4
2
v AB
4E
0
4
2
(a) Waveforms
V AB n / V d
m f  12
0.15
4m f  1
n=1
0.10
4m f  5
0.05
4m f  5
0
1
10
20
30
(b) Spectrum
40
50
60
n
• fsw (device) = 60(mf ) = 720Hz
• fsw (inverter) = 60(4mf ) = 2880Hz
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Multilevel Flying Capacitor Inverters
Topic 8
• Summary
Features
- Low harmonic distortion with low dv/dt
- Modular design
Drawbacks
- Large number of dc capacitors
- Complex pre-charging circuits
- Difficulties in dc cap voltage balancing control
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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EE8407
Topic 8
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley - IEEE Press, 2006
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