jXLI
4
© Manitoba HVDC Research Centre
Phase Locked Loop (PLL)
110 fsrc f (P LL)
[Hz]
Extracting the phase angle of phase-A voltage
100 90 80 70 60 50 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 0.10 0.00 -0.10 -0.20 -0.30 -0.40 -0.50 -0.60 Theta
8
Modular multilevel converters
+VDC/2
: Graphs E reference 1.00 Eac MMC
0.50
V
0.00
E
-0.50
VAC
VDC VDC VDC
-1.00
sec
0.0000
0.0050
0.0100
0.0150
0.0200
-VDC/2
© Manitoba HVDC Research Centre | a division of Manitoba Hydro International Ltd.
[rad]
Vq
[kV]
Cos(Theta) 1.00 0.50
Va
[kV]
t [s]
0.00 -0.50 -1.00 2.520 2.540 2.560 2.580 2.600 2.620 2.640 2.660 2.680 2.700
© Manitoba HVDC Research Centre
|
1
Table of contents
1. 2. 3. 4. 5. 6. Modular multi-level converters dq decoupled vector current control Half and H-bridge converters Detailed equivalent models of MMC valves Simulation of a two-terminal system Simulation of a dc-fault and re-start process (half- and H-bridge MMCs) 7. Setup of a three-terminal system (on-line demonstration – if time allows) 8. Questions
vd x1
L
id* id
+-
PI
-+ -
ed
iq iq* +PI
L
x2
-+ +
vq
eq
© Manitoba HVDC Research Centre
|
a division of Manitoba Hydro International Ltd.
7
Modular multilevel converters
0.50
V
0.00
E
-0.50
VAC
-1.00
VDC V VDC DC VDC V DC VDC DC VDC
sec
0.0000
0.0050
0.0100
+VDC/2
: Graphs E reference 1.00 Eac MMC
0.50
V
0.00
E
-0.50
VAC
-1.00
VDC VDC VDC V VDC DC VDC V DC VDC DC VDC
sec
0.0000
0.0050
0.0100
0.0150
0.0200
-VDC/2
© Manitoba HVDC Research Centre | a division of Manitoba Hydro International Ltd.
θ
dq abc
VDC controller
iq1* Imax
1: Q control 2: Vac control
Vabc*
Valve controls
vq * id iq
Q*
d/dt
PI
Rate limiter VAC droop controller
Q controller
Q
Vac*
d/dt
Q
PI
I δ V I δ E V jXLI E jXLI
Absorbing P: Neglecting R: ∠0
∗
∠ ⇒ sin cos
V
Supplying Q:
I
V
jXLI E
Absorbing Q:
| a division of Manitoba Hydro International Ltd.
I
E
0.0150
0.0200
-VDC/2
© Manitoba HVDC Research Centre | a division of Manitoba Hydro International Ltd.
14
Modular multilevel converters
+VDC/2
: Graphs E reference 1.00 Eac MMC
0.0150
0.0200
-VDC/2
© Manitoba HVDC Research Centre | a division of Manitoba Hydro International Ltd.
16
Modular multilevel converters
+VDC/2
: Graphs E reference 1.00 Eac MMC
support@
© Manitoba HVDC Research Centre
|
a division of Manitoba Hydro International Ltd.
3
Grid-connected VSC: Operation principle
∠0 ∠
Supplying P:
© Manitoba HVDC Research Centre
|
a division of Manitoba Hydro International Ltd.
2
If you have questions during the Webinar
• Please e-mail PSCAD Support at
11
Modular multilevel converters
+VDC/2
: Graphs E reference 1.00 Eac MMC
0.50
V
0.00
E
-0.50
VAC
-1.00
VDC VDC VDC DC VDC
sec
0.0000
0.0050
0.0100
0.0150
0.0200
-VDC/2
0.50
V
0.00
E
-0.50
VAC
-1.00
VDC VDC V DC VDC DC VDC
sec
0.0000
0.0050
0.0100
0.0150
0.0200
-VDC/2
© Manitoba HVDC Research Centre | a division of Manitoba Hydro International Ltd.
abc
dq
P*
d/dt
vdq θ
PI
P
-
P controller
1: P control 2: Vdc control
Iabc
abc
dq
Rate limiter
idq
Vdc*
d/dt
Rate limiter
PI
Vdc id1
*
Current limiter
id* Decoupled vd* iq*
current controller
Webinar:
MMC- Technologies
Presenters: Juan Carlos Garcia and Farid Mosallat February 26 - 2015
© Manitoba HVDC Research Centre
|
a division of Manitoba Hydro International Ltd.
15
Modular multilevel converters
+VDC/2
: Graphs E reference 1.00 Eac MMC
0.50
V
0.00
E
-0.50
VAC
-1.00
VDC VDC VDC V VDC DC VDC V DC VDC DC VDC
sec
0.0000
0.0050
0.0100
17
Modular multilevel converters
+VDC/2
: Graphs E reference 1.00 Eac MMC
0.50
V
0.00
E
-0.50
VAC
-1.00
VDC VDC V VDC DC VDC V DC VDC DC VDC
sec
0.0000
0.0050
0.0100
0.50
V
0.00