VSC-HVDC control
13
Continuous powergui Ua Ub Uc Up Un VSC DC Voltage Source1 A B C Three-Phase Source
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Transcript of VSC-HVDC control
7/24/2019 VSC-HVDC control
http://slidepdf.com/reader/full/vsc-hvdc-control 1/13
Continuous
powergui
Ua
Ub
Uc
Up
Un
VSC
DC Voltage Source1
A
B
C
Three-Phase Source
7/24/2019 VSC-HVDC control
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c
a
+0.2 ohm
800uF
+
0.2 ohm
800uF
4 Up
5 Un
1
Ua
2
Ub
3
UcB1
A
B
C
+
N
-
Three-Level Bridge
IGBT/Diodes
12
pulse12
v+-
Vab
v+-
Vbc
v+-
Vbc1
U_ab
U_bc
U_ca
Phase voltage calculation Mathematical calculationsPark transformationPower measurement
Inner current control Inverse park transformation PWM genration
+
its resistance
+
Current smoothing
inductor and
+
+
+
+
b
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PU scaling
Instantaneous RMS current in dq frame
Instantaneous RMS voltage in dq frame PU scaling
u
Sqrt
u2
Math
Function
Vd
Vq
u2
Math
Function1
Vd_q
u
Sqrt1
u2
Math
Function2
Id
Iq
u2
Math
Function3
Id_q
K-
Vd
Vd_pu
K-
Vq
Vq_pu
K-
Vd_q
Vd_q_pu
K-
Id_pu
K-
Iq
Iq_pu
K-
Id_q
Id_q_pu
Scope
12
-T-
- -
pulse12
Id_pu
7/24/2019 VSC-HVDC control
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abcFreq
wt
PLL
(3ph)
3
3
a
Vb
c
f
abc
wt dq0
abc to dq0
33
th 3
Vd
Vq
abc
wt dq0
abc to dq1
33
3
Id
Iqth
Iabc3
V0
Scope2
3
I0
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Caclulating the phase voltagesthis way eliminates the zero sequence voltages
U_ab
U_ca
0.333
Gain
Va
U_bc
U_ab
0.333
Gain1
Vb
U_ca
U_bc
0.333
Gain2
Vc
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Vabc
Iabc
P
Q
Power
(3ph, Phasor)
3
3Vabc
3
Iabc3
P_conv
Q_conv
Scope1
3
3
P_conv
Q_conv
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D
F
F
D
F
FeedForward
D D
E
B
FF
D
F
FeedForward
D
E
PI(s)
Idx
Id_pu
0.06
r_pu
0.0008
L_pu
f 6.28319
L_pu1
w
w
Vd_pu
Udx
PI(s)
Iqx
Iq_pu
0.06
r_pu
0.0008
L_pu
w
Uqx
Vq_pu
Idx
Step
Iqx
Step1
Scope3
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dq0
wt
abc
dq0 to abc
33
th
3
Udx
UqxV_abc_ref
3
Scope4
3
V0
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Uref P
PWM Generator
(3-Level)
12
3-T-
3pulse
12
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Triangle
Generator
1
P12
Sine Wave
3
Uref
C_pnS
Half bridge (1-ph)
and 3-ph bridge
3
2
3
NOT
==
1
*, 2
Multiport
Switch1
3
3
3
Uref
C_pnS
Full bridge (1-ph)
2
2
1
*, 22
2
2
0
*, 1
Multiport
Switch2
3
3
3
Selector_FullBridgeOut
2
3
Selector_FullBridgeIn
3
U Y
Selector_Pout
12
12
Selector_HalfBridgeOut
3
3State Pulses
State-to-Pulses
Decoder
3
12
nF
2
sps.CmdModulatingSignals
2
sps.ModulatorMode
2
sin
double12
12
asin
sps.ModulatorType
1/pi
0.5
0.5 * ( u(1)-1 )
0.5 * ( u(1)+1 )
wt
1
Uref
3
States
States
Uref
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1
S2
-1
<=
<=
2
2
>=
>=
Enable
2
C_pn
2
1
Uref
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1
S3
3
33
<=3
3
2
>=33
Enable
2
C_pn
2
1
Uref
3
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State
1
Firing pulses
1 1 0 0
Q1 Q2 Q3 Q4
0 0 1 1 0
-1 0 0 1 1
|||||||||
--------------------------------------------------------------
3-phase State-to-Pulses Decoder
Phase B: 5 to 8
Phase A: 1 to 4
Phase C: 9 to 12
|||
[Q1]||
||
[Q2]||
||
[Q3]||
||
[Q4]
|||
----------[D]---------
----------[D]---------
---------- A
|||||||||||
N -----------
- Vdc--------------------------
+ Vdc --------------------------
SelectorStatePulse
3
3
1Pulses
12
33
4
412
4
1
2
*, 3
4
4
4
4
1
2
*, 3
4
4
4
4
1
2
*, 34
44
4
3
2
[0 1 1 0]4
[0 0 1 1]4
[1 1 0 0]4
1
State
3
