slides topic 3 - ryerson universitybwu/courses_teaching/8412/x8412_slides_topic3.pdf · 1 1 ee8412...
TRANSCRIPT
1
1
EE8412Advanced AC Drive Systems
Topic 3Power Converter Topologies
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
Courtesy of ABB
2
Lecture Topics
1) Two-level Voltage Source Inverters 2) Cascaded H-bridge (CHB) Inverters 3) Neutral Point Lamped (NPC) Inverters4) Current Source Converters
EE8412 Advanced AC Drive Systems
Power Converter TopologiesEE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
2
3
• Inverter Configuration
dC∞dV
1S
2S
3S 5S
4S 6S
1D
2D
3D
4D
5D
6D
1g 3g 5g
2g4g 6g
AiA
BC
O
P
N
LOAD
Bi
Ci
Assumption: dc capacitor very large → dc voltage ripple free
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
4
• Square Wave Operation
Why called two-level? vAN = 0 or =Vd
tω
tω
tω
tω
tω
tω
tω
tωπ π2 π3
3π3π
dV
dVA Bv
B Nv
A Nv
0
C Nv
A Ov
0
0
0
0
0
Ai
1gv2gv
3gv
4gv
5gv
6gv
32 /dV 3/dV
2π
C urrent-carrying devices in leg A4S4D1S1D
1S
2S
3S 5S
4S 6S
1D
2D
3D
4D
5D
6D
1g 3g 5g
2g4g 6g
AiA
BC
P
N
Bi
CidC∞dV
• Gating arrangements60° apartConduction angle: 180°Complementary gating: S1 on → S4 offS3 on → S6 offS5 on → S2 off
• During first 60° periodS1 on , VAN = VdS6 on, VBN = 0S5 on, VCN = Vd
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
3
5
• Inverter Output Voltage
• Line-to-line voltage
⎟⎠⎞
⎜⎝⎛ +⎟
⎠⎞
⎜⎝⎛= ∑
∞
=
)6
(sin6
cos4...,13,11,7,5,1
πωππ
tnnnVv
n
dAB
• Fundamental-frequency voltage
dd
AB VVV 78.06
cos2
41 ==
ππ
• rms voltage
dd
dd
ABAB
VV
tdVtdV
tdvV
816.032
)()()()(21
)(21
2/13/2
0
3/5 22
2/12
0
2
==
⎟⎠⎞
⎜⎝⎛
⎟⎠⎞⎜
⎝⎛ −+=
⎟⎠⎞
⎜⎝⎛=
∫ ∫
∫π π
π
π
ωωπ
ωπ
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
6
• Load Phase Voltage
• Phase voltage calculation
⎪⎩
⎪⎨
⎧
−=−=−=
3/)(3/)(3/)(
BCCACO
ABBCBO
CAABAO
vvvvvvvvv
• Fourier expression
• rms value
( )tnVn
vn
dAO ωπ
sin2...,13,11,7,5,1
∑∞
=
=
ddAOAO VVtdvV 47.032)()(
21 2/1
2
0
2 ==⎟⎠⎞
⎜⎝⎛= ∫
πω
π
dC∞dV
1S
2S
3S 5S
4S 6S
1D
2D
3D
4D
5D
6D
1g 3g 5g
2g4g 6g
AiA
BC
O
P
N
LOAD
Bi
Ci
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
4
7
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
• Modulating and Carrier Waves
• vcr – Carrier wave (triangle) • Amplitude modulation index
cr
ma V
Vm ˆˆ
=
• Frequency modulation index
m
crf f
fm =
v mAv Bmv Cmvcrv
crV̂ mV̂tω
• vm – Modulating wave (sine)
8
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
• Gate Signal Generation
1gv
4gv
dVANv
π π2
mAv crv
crmA vv > 01 >gv )0( 4 <gv 1S on )off( 4S dAN Vv = Phase A
crmA vv < 04 >gv )0( 1 <gv 4S on )off( 1S 0=ANv
Vg1 and Vg4 are complementary
5
9
ABv
BNv
ANv
0
0
0
v mAv Bmv Cmvcrv
crV̂ mV̂
dV
dV
dV
π π2tω
tω
tω
tω
1ABv
1S
2S
3S 5S
4S 6S
B
C
P
N
dV
A
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
• Line-to-Line Voltage vAB
10
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
• Low order harmonics, n < (mf -2), are eliminated
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
• Waveforms and FFT
• ma = 0.8, mf = 15, fm = 60Hz, fcr = 900Hz
• Switching frequencyfsw = fcr = 900Hz
dV
3/2 dV
ABv
AOv
Ai
2±fm
12 ±fm
23 ±fm 14 ±fm
π3
π3π2
π2π
π
dVVAB 49.01 =
dn VVAB /
6
11
• Harmonic Content
• VAB1 versus ma is linear
• VAB1,max = 0.612Vd
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
am
12 ±fm2±fm
14 ±fm23 ±fm
43 ±fm
d
nAB
V
V
1=n
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
12
• Space Vector Modulation (introduction)
α1Vr
0Vr
3Vr
2Vr
4Vr
5Vr
6Vr
βj
POO
PPOOPO
OPP
OOP POP
refVr
θOOOPPP
SECTOR ISECTOR III
SECTOR IV SECTOR VISECTOR V
SECTORII
ω
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
7
13
ABv
AOv
0
0
0
Ai
dV
3/2 dV
π π2 π3
π π2 π3
VIVISector
III
IIIIV
V
III
IIIIV
V
• f1 = 60Hz, fsw = 900Hz, ma = 0.696, Ts = 1.1ms
• Space Vector Modulation (introduction)
Topic 3 Power Converter Topologies
Two-level Voltage Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
14Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
CHB Inverter Fed MV Drive Source: ASI Robicon
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters
EE8412
8
15
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters• Converter Topologies (5-level)
Converters in cascade, but no switching devices in series.
ComplementarySwitch pairs:S11 and S41;S31 and S21;
S12 and S42;S32 and S22;
1Hv
2Hv
N
21S
11S
41S
31S
22S42S
32S12S
E
E
E
E
E
E
A B C
O
LOAD
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
16
1Hv
2Hv
21S
11S
41S
31S
22S42S
32S12S
E
E
A
3Hv
23S43S
33S13S
E
N
1Hv
2Hv
E
E
A
3HvE
4HvE
N
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters• Converter Topologies (7- and 9-levels)
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
9
17
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters
Amv
1crv 2crv 3crv
11gv
31gv
1Hvπ
12gv
32gv
2Hv
13gv
33gv
3Hv
π0
ANv
E
3E
0
1.0
-1.0
E
−1crv−2crv −3crv
E
π
π
321 HHH vvvvAN ++=
• # of voltage levels: m = 7• # of carriers: mc = m - 1 = 6
• Phase shift: 360°/ mc = 60°
Carriers:vcr1 and vcr1-
Carriers:vcr2 and vcr2-
Carriers:vcr3 and vcr3-
m = 7
• Phase Shifted PWM
EE8412
1Hv
2Hv
21S
11S
41S
31S
22S42S
32S12S
E
E
A
H1
H2
3Hv
23S43S
33S13S
E
H3 N
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
18
• Inverter Waveforms (7-level, phase shifted)
1Hv
2Hv
3Hv
0
ANv
0
ABv
3E
6E
• Switching occurs at different times
• fsw(device) = 60 mf = 600Hz
• Inverter phase voltage levels: 7
• Low EMI
• Line-to-line voltage levels: 12
• Close to a sinusoid• Low THD
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
10
19
•Lowest harmonics: around 2mf
• Lowest harmonics: around 6mf
• Containing triplen harmonics
• No triplen harmonics• Equivalent fsw(inverter)
= 60(6mf ) = 3600Hz
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters• Harmonic Spectrum (7-level, phase shifted)
EE8412
12 ±fm14 ±fm 16 ±fm
36 ±fm96 −fm 96 +fm
16 ±fm76 −fm 76 +fm
dn VV /H1
dANn VV /
dABn VV /
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
20
• Harmonic Content (7-level, phase shifted)
00.2 0.4 0.6 0.80 am
0.1
0.2
0.3
d
n
V
VAB
16 ±fm
56 ±fm 76 ±fm
116 ±fm
x∆
y∆ 2241.xy=
∆
∆
1=n
• Inverter equivalent switching frequency: fsw(inv) = 6 fsw(device)• Small filter size for sinusoidal outputs.
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
11
21
• Level Shifted PWM• # of voltage levels: m = 5• # of carriers: mc = m - 1 = 4
• IPD provides the best harmonic profile.
-1.0
0
1.0mv
π2π
π3
1crv
(a) In-phase disposition (IPD)
2crv
3crv
4crv
π π2 π3
(b) Alternative phase opposition disposition (APOD)
mv
ππ2
(c) Phase opposition disposition (POD)
mv
-1.0
0
1.0
1crv
2crv
3crv
4crv
-1.0
0
1.0
1crv
2crv
3crv
4crv
IPD
APOD
POD
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
22
• Gating Pulse Arrangement (7-level, IPD)cr1vcr2vcr3v
π
π
π
π
g11vg31v
1Hv
12gv32gv
2Hv
13gv33gv
3Hv
ANv
mAv
-cr1v
-cr3v-cr2v
3H2H1HAN vvvv ++=
• # of voltage levels: m = 7• # of carriers: mc = m - 1 = 6
• fsw(device) << fcr (900Hz)• fsw(device) – Not the same for
all switches.• Device conduction
angle – not equal.
• Necessary to swap switching pattern.
• m = 7
}
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
12
23
• m = 7
• Close to a sinusoid • Low THD, low EMI
• Equivalent fsw(inv) = fcr = 3600Hz
• Switching occurs at different times
• fsw(device) = fcr /mc =600Hz (avg.)
Topic 3 Power Converter Topologies
Cascaded H-bridge Inverters• Inverter Output Voltages (7-level, IPD)
EE8412
1Hv
2Hv
3Hv
ANv
ABv
2±fm8+fm8−fm
16+fm16−fm
π2 π4
π2 π4
dABn VV /
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
24Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
NPC Inverter Fed MV Drive Courtesy of Siemens
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters
EE8412
13
25
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters• Inverter Topology (three-level NPC)
Six clamping diodes: DA1, DA2 , DB1, DB2 , DC1 and DC2
EE8412
1dC
1S
2S
3S
4S
AB
CZ
2dC
1D
2D
3D
4D
1ZD
2ZD
E
E
ZidV
Ai
OBi
Ci
di
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
26
Complementary Switch pairs:SX1 and SX3; SX2 and SX4;
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters• Switching State
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
14
27
• Space Vector Diagram
19 space vectors:Zero vector: V0Small vectors: V1 – V6Medium vectors: V7 – V12Large vectors: V13 – V18
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters
1Vr
13Vr
7Vr
14Vr
0Vr
3Vr
2Vr
4Vr
5Vr
8Vr
6Vr
15Vr
18Vr
12Vr
11Vr
10Vr
9Vr
17Vr
16Vr
refVr
θ
Sector I
Sector II
Sector III
Sector IV
Sector V
Sector VI
Six sectors: I, II, III, IV, V, VI
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
28
• Simulated Waveforms (Space vector Modulation)
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters
EE8412
AZv
ABv
0
0
0.05
0.1
dAB VV n /
0.15THD = 41.0%
1gv
4gv
0+E
-E
+2E
-2E
n1 5 10 15 20 25 30 35 40 45 50 55 60
π π2 π3
14 16 20 22 26 28
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
15
29
dnAB VV /
am
am
dnAB VV /
• Harmonic Spectrum (Space vector Modulation)
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
30
• Level-shifted PWM (four-level)1 .0
-1 .0
3gv2gv
1gv
0
A Nv
0
Ai
3E
0 π π2 π3
A Bv
(a )
(b )
(c)
(d )
(e)
1c rv
2crv
3c rv
3E
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
16
31
• Harmonic Content (four-level, IPD Modulation)
Topic 3 Power Converter Topologies
Neutral Point Lamped (NPC) Inverters
EE8412
am
dAB VV n /
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
32Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
PWM Current Source Converter Fed MV Drive Courtesy of Rockwell Automation
Topic 3 Power Converter Topologies
Current Source Converters
EE8412
17
33
Topic 3 Power Converter Topologies
Current Source Converters• Current Source Inverter
Features:- Simple topology – no antiparallel diodes- Reliable short circuit protection – constant dc current- Very low dv/dt on motor terminals- Four quadrant operation
• Switching devices:- Reverse blocking GCT
Function of output capacitor C:- Assist GCT commutation- Reduce harmonic distortion
EE8412
1S
2S
3S 5S
4S 6S
dI
wi
ci
si
fC
4g 6g 2g
1g 3g 5g
A
B
C
fC fCLOAD
O
ABv
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
34
1) Trapezoidal PWM (TPWM)
2) Selective Harmonic Elimination (SHE)
3) Space Vector Modulation (SVM)
Topic 3 Power Converter Topologies
Current Source Inverter• PWM Techniques
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
18
35
Topic 3 Power Converter Topologies
Current Source Inverter• Switching Constraints
- dc current Id cannot be interrupted,- Inverter output current waveform
must be defined.
At any time instant, only two switches are turned on,one switch connected to the positive dc bus, and the other to the negative dc bus.
1S
2S
3S 5S
4S 6S
dI
wi
4g 6g 2g
1g 3g 5g
A
B
C
P
N
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
36
Topic 3 Power Converter Topologies
Current Source Inverter• Trapezoidal PWM (TPWM)
1gv
2gv
3gv
4gv
5gv
6gv
0
wi
3π
32π π π2
tω
tω
tω
tω
tω
tω
tωdI
π2
3π
32π
tω
crv mv
mV̂ crV̂
0π π2
• Number of pulses per half cycle: Np = 7
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
19
37
Topic 3 Power Converter Topologies
Current Source Inverter• Harmonic Content
(TPWM) 1ˆw
wn
II
n = 5
0.2 0.4 0.6 0.80
0.04
0.12
0.08
0.16
29
23
250
0.2 0.4 0.6 0.80am
0.2
0.4
0.6
0.8
n = 7n = 11
n = 17n = 13
19
n = 5n = 7
n = 1
1ˆw
wn
II
am
• Np = 15
• Fundamental doesnot change muchwith ma
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
38
Topic 3 Power Converter Topologies
Current Source Inverter• Inverter Waveforms (TPWM)
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
20
39
Topic 3 Power Converter Topologies
Current Source Inverter• Selective Harmonic Elimination (SHE)
• Not all the switching angles are independent.• Only two harmonics can be eliminated with 5 pulses per half cycle.
• No modulation index control – the magnitude of inverter output current is controlled by the dc link current Id
• Number of harmonics to be eliminated: 2/)1( −= pNk
EE8412
π3π
32π π21θ 2θ
6π
23θπ
−
dI
tω
wi
13θπ −
0
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
40
Harmonic eliminated: 5th and 7th
• Inverter Waveforms (SHE)
Topic 3 Power Converter Topologies
Current Source Inverter
EE8412
Harmonic eliminated: 5th
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
21
41
• Definition of- six active current vectors and one zero vector; - six sectors.
Topic 3 Power Converter Topologies
Current Source Inverter• Space Vector Modulation (SVM)
EE8412
SECTOR I
SECTOR III
SECTOR IV
SECTOR VISECTOR V
α
βj
θ
ω
SECTOR II
1Ir
2Ir
3Ir
6Ir
5Ir
4Ir
refIr
0Ir
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
42
wi
si
ABv
π2 π4
π2 π4
Topic 3 Power Converter Topologies
Current Source Inverter• Simulated Waveforms (SVM)
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
22
43
• Harmonic Content (SVM)
0
0.02
0.04
0.06
0.08
1wwn II
0 0.2 0.4 0.6 0.8
n = 1
n = 5
19
17
711
13
am
Topic 3 Power Converter Topologies
Current Source Inverter
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
44
• Switching devices:Reverse blocking GCT
• Function of filter capacitor Cf:To assist GCT commutation;To reduce line current THD.
sLsvsi wi
A
B
C
dv
2S4S 6S
didL
UtilitySupply
1g
1S 3S 5S
fC
LOAD
Topic 3 Power Converter Topologies
Current Source Rectifier• Converter Topology
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
23
45
Topic 3 Power Converter Topologies
Current Source Rectifier
1) Selective Harmonic Elimination (SHE)2) Space Vector Modulation (SVM)
• PWM Techniques
• Experimental Waveforms (SHE with 5th and 7th harmonic elimination)
Trace A: current in switch S1Trace B: Rectifier input current iwTrace C: Line current is
ma = 0.7 ma = 0.95
EE8412
Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
46Textbook: Bin Wu, ‘High-Power Converters and AC Drives’, Wiley-IEEE Press, 2006, ISBN: 0-471-73171-4
EE8412 Advanced AC Drive Systems
Topic 3 Power Converter Topologies