Comparison NPC versus NPC2, customer version, 04[1].10.2011

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NPC vs. NPC2: Operating Area 4
1
VDC/2
VDC/2
4.
T1 D5 D1
V>0 I<0
+
+
T1 D5 D1
U I ( ( x )
3L NPC
Voltage V Current I
V>0 I>0
x
)
4
1
T2 N T3 D6
VDC/2
D2
T2
D2
1,050
Lower losses at NPC Lower losses at NPC2
cos(phi)=1 cos(phi)=-1 cos(phi)=0,7
1,000
0,950
P_V_NPC2 / P_V_NPC
0,900
0,850
0,800
cos(phi)=-0,7
0,750
3x IGC99 T120 T6RM 3x SKCD53 C120 I4F 2x IRGC4147
DC+
VDC/2
D5 T2 N T3 D6 D3
VDC/2
D1 D2 T3 T1 AC T2 D3 D4 T4
D2 AC
N
T4
D4
DC-
DC2
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Operating Areas
There are 4 operating areas within one period of a sine output voltage and current as shown below (valid for all other topologies as well):
Comparison: NPC vs. NPC2
Ingo Staudt Semikron Elektronik GmbH & Co. KG
Operating Areas
3L NPC (Neutral Point Clamped)
DC+
T1 D1
3L NPC2 (T Type, Mixed Voltage)
3000
Power losses versus switching frequency at cos(phi)=1
2500
Power losses [W]
2000 1500 1000 500 0 1 3 5 7 10 12 15 17 20 switching frequency f_sw [kHz]
VDC/2
D2
T2
D2
PWM
N D3 D6 T4 D4
VDC/2
T3
D3
Operating area 2
V<0 I>0
T4
D4
-
-
long commutation path
2
+
VDC/2
+
D1 D2 T3 T1 AC D3
VDC/2 VDC/2
3L NPC2
D1 D2 T3 T1 AC D3 D4 T4
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NPC vs. NPC2: Comparison
Comparison of key issues of 3L topology:
NPC2 Control (PWM pulse pattern) same pattern for both none (any switch at any time) none
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V<0 I>0
2
4
NPC vs. NPC2: Operating Area 2
V>0 I<0
1
VDC/2
VDC/2
2.
T1 D5 D1
V<0 I>0
+
+
T1 D5 D1
U I
3L NPC
4
1 0
Voltage V Current I
V<0 I<0
(
x
)
(
x
)
2
3
x
T2 N T3 D6
T1 T2 T3 T4 D1 D2 D3 D4 D5 D6

P P P P x P P P P P -

P x P x P P P

x P P P P P P

P P x x
Pcond Psw Pcond Psw Pcond Psw Pcond Psw
3L NPC
Same formulas as for NPC are applicable for NPC2 (with respect to the change in nomenclature)
VDC/2
N T2
D4 T4
During the shown operating area the current commutates back and forth between the two red paths with the speed of the switching frequency.
} }
≙ D6 in 3L NPC ≙ D5 in 3L NPC
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650V NPC vs. 1200V/650V NPC2
NPC2 produces less losses up to fsw of approx. 13kHz
1,100
Comparison 650V NPC versus 1200V/650V NPC2
D2
T2
D2
PWM
N D3 D6 T4 D4
VDC/2
T3
D3
Operating area 3
V<0 I<0
T4
D4
-
-
short commutation path
3
+
VDC/2
+
D1 D2 T3 T1 AC D3
VDC/2 VDC/2
3L NPC2
D1 D2 T3 T1 AC D3 D4 T4
N T2


P x P P P P P x P P P P -

x P P P P P -

P P x -
Pcond Psw Pcond Psw Pcond Psw Pcond Psw
3L NPC2
T1 T2 T3 T4 D1 D2 D3 D4
P P P -
„P“ - device produces losses „x“ - device produces no losses „-“ - device not active
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5
NPC vs. NPC2: Operating Area 3
+
VDC/2 VDC/2
3.
T1 D5 D1
+
U I ( ( x )
1
ቤተ መጻሕፍቲ ባይዱ
x
Voltage V Current I
T1 D5
4
1
D1
V>0 I>0
V<0 I<0
)
3L NPC
1
3
0 x
4
T2 N T3 D6
VDC/2
2L module: SKiM429GD17T4HD
7000
Power losses versus switching frequency at cos(phi)=1
6000
5000
Power losses [W]
4000
2L 3L NPC 3000 3L NPC2
2000
1000
0 1 3 5 7 10 12 15 17 20 switching frequency f_sw [kHz]
0,700
2x SKCD42 C065 I4F VDC=800V VAC=400V IAC=200A
0,650
0,600 1 3 5 7 10 12 15 17 20
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switching frequency f_sw [kHz]
10
2L vs. NPC vs. NPC2
2L module: SEMIX 604GB 12E4s
3x IGC101 T170 E4 3x SKCD61 C170 I4HD 2x IGC99 T120 T6RM
1,250
2x SKCD53 C120 I4F
1,200
VDC=1300V VAC=690V IAC=150A
1,150
P_V_NPC2 / P_V_NPC
1,100
1,050
Lower losses at NPC Lower losses at NPC2

1 0
PWM
D3
N T3 D6
VDC/2
D3
Operating area 4
V>0 I<0
T4
D4
T4
D4
-
-
long commutation path
4
+
VDC/2
+
D1 D2 T3 T1 AC D3
VDC/2 VDC/2
3L NPC2
D1 D2 T3 T1 AC D3 D4 T4
N T2
VDC/2
NPC
Switch-off sequence Potentials without terminal / Paralleling of modules Commutation paths