prediction of cm conducted emi in pwm inverter-fed machine system
TRANSCRIPT
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7/27/2019 Prediction of CM Conducted EMI in PWM Inverter-fed Machine System
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Institute of Power electronics, Naval University of EngineeringWuHan, HuBei, P.R.C
[email protected]@[email protected]
Abstract In ships, more and more power electronics converters
are used in the same power mains. Such power supply system can
be called an isolated power system. System-level EMI
prediction is necessary. All interference sources in the system
should be considered. But numerical simulation is time
consuming and need special software. EMC engineers need fast
prediction method rather than a very precise model. Based on
simple frequency domain calculation, a quickly prediction
method is proposed in this paper. Adopting this method, the
common mode interference in an inverter-fed machine system is
calculated. Prediction and experimental results about verify this
method.
A. System Layout
B. Equivalent circuit
2008 Asia-Pacific Sympsoium on Electromagnetic Compatibility &
82719th International Zurich Symposium on Electromagnetic Compatibility, 1922 May 2008, Singapore
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7/27/2019 Prediction of CM Conducted EMI in PWM Inverter-fed Machine System
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19th International Zurich Symposium on Electromagnetic Compatibility, 1922 May 2008, Singapore
A. Interference Source in Rectifier
tEe
tEe
tEe
c
b
a
t
cab Ue di
E
UC
d
cd
s
i
UEd
diL
s
c
ss
c
s
dL
U
L
E
L
U
L
Ei
di
E
Uc
bNObNO
aNOaNO
bNb
sb
aNa
sa
uuu
uuu
udt
diLe
udt
diLe
cOa
Uu
cOb
Uu ba ii
baNO
eeu
NOu
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2008 Asia-Pacific Sympsoium on Electromagnetic Compatibility, 1922 May 2008, Singapore
NOu
Time Interval Expression
tE
tE
tE
tE
tE
tE
B. Interference Generated by Rectifier
Z
LLISNcm ZZZ
icom
LLISN
NOcom
ZZ
ui
comi
ecmcm
cmcomcm
LjZZ
ZiI
cem
mcmcmcm
LLC
CjZII
Z
ecmpmp
cemcm
LLCCjCCj
LLCZ
C. Inverter EMI Source
NOCOCN
NOBOBN
NOAOAN
UUUiRdt
diL
UUUiRdt
diL
UUUiRdt
diL
iii
NOCOBOAO UUUU
T S
a
a
aS
-Sa
dca
dca
dcaAO
VS
VS
VSU
UBOUCO
UNO
cbai
idc
NO SV
U
l
sl
n
n
dc
lsl
n
ndc
s
n
n
dc
cbai
ihdc
com
tlnan
Jn
v
tln
anJ
nv
tnan
Jn
v
Sv
v
D. Interference Generate by Inverter
ecmcmm
mcomcm
LLCZCj
CjVI
ecLISN
cmcmcm
LLjZ
ZII
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7/27/2019 Prediction of CM Conducted EMI in PWM Inverter-fed Machine System
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19th International Zurich Symposium on Electromagnetic Compatibility, 1922 May 2008, Singapore
ecpLISNp
ecLISNcm
LLCZCj
LLjZZ
E. Experiment Setup
F. Experiment Results
104
105
106
107
5
10
15
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25
30
35
40
Icm1
Icm2
Frequency( Hz)
Magnitude
dBA
104
105
106
107
0
10
20
30
40
50
60
70
80
Frequency( Hz)
Magnitude
dBA
Icm2
Icm1
104
105
106
107
0
10
20
30
40
50
60
70
80
Frequency( Hz)
Magnitude
dBA
Icm2
Icm1
104
105
106
107
0
10
20
30
40
50
60
70
80
Frequency( Hz)
Magnitude
dBA
Icm1
:Predicted Result and Measurement Result
Predicted Result
Measurement Result
104
105
106
107
0
10
20
30
40
50
60
70
80
Frequency( Hz)
Magnitude
dBA
Icm2
:Predicted Result and Measurement Result
Predicted Result
Measurement Result
IEEE Trans. on Power Electronics
IEEE Transactions on IndustryApplications
Electromagnetic Compatibility in Power Electronics
PWM Inverter and soft switching Power Converter
Technique
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