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Dr. Pang Hui
CEPRI of State Grid Corp. of China
Aug 31, 2011
Real-time Simulation Technology forModular Multilevel Converter Based
HVDC Transmission
VSC-HVDC based on two-level or triple-
level converters
VSC-HVDC based on multi-level modular converters (MMC)
VSC-HVDC in Brief
Simulation Technology for HVDC
Electro-mechanical simulation based
commercial software
Electro-magnetic simulation based
commercial software
Real time digital simulation system
vconv
Pconv Iconv
Uconv UL
DC cable
converter valveA BDC cable
converter valve
Large nodes in the modular multilevel
converter
Small nodes in the two level or triple level
converter
Difficult in simulation of MMC-HVDC
Composite of simulation platform
Digital accessorial
Electronic device
Valve controller
Control and protect system
Function of simulation platform
Control procedure of MMC-HVDC, such as charging process on system stirring
Modulation control method of converter
Operating performance under steady state and transient state
Balance control to voltage and current of converter
Response to power-step-order
AC and DC network faults
Summary of Nanhui VSC-HVDC Project
Rated DC voltage of ±30kV
Rated DC current of 300A
Converter of 18MW with 49-level MMC
The transmission line is about 8km cables
Summary of simulation system
Capacity of 300VA;
transformer voltage on valve side of 142V,
short-circuit impedance ratio of 0.08;
converter leg reactor of 0.15p.u.;
DC voltage of ± 140V.
Study with simulation software
0.980 1.000 1.020 1.040 1.060 1.080 1.100 1.120 1.140 1.160 1.180 1.200
-5.0 -4.0 -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 4.0 5.0
(p ) (p ) (p )
DC line fault analysis and simulation in PSCAD/EMTDC
0.98 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14-6
-4
-2
0
2
4
t/s
Ia(p
.u)
real-time simulation platform with over-current-protect
PSCAD simulation without protect strategy
A phase current after fault
Apply of dynamic simulation system
Apply of dynamic simulation system
Udc rapidly reduced to about zero after short-circuit fault
1 1.05 1.1
-0.10
0.2
0.4
0.6
t/s
Udc
(p.u
)
real-time simulation platformPSCAD simulation
0.48 0.5 0.52 0.54 0.56 0.58 0.6 0.62-100
0
100
AC
T_P
WR
0.48 0.5 0.52 0.54 0.56 0.58 0.6 0.62-50
0
50
UA
C_A
LFA
UA
C_B
ETA
0.48 0.5 0.52 0.54 0.56 0.58 0.6 0.62-2000
0
2000
IV_L
1IV
_L2
IV_L
3
File: TFR FH_S2P1PCPA1 TR1 20110112 19;32;47_171000.CFG
0.48 0.5 0.52 0.54 0.56 0.58 0.6 0.620
50
100
UD
C
0.48 0.5 0.52 0.54 0.56 0.58 0.6 0.62-50
0
50
RE
AC
T_P
WR
0.48 0.5 0.52 0.54 0.56 0.58 0.6 0.62
DEBL_SEQVBC_TRIP
PERM_BAC_TRIP
Time [s]
Wave record for protection after short fault in project
Wave record in the project
Conclusion
The dynamic simulation platform has a good equivalent and high accuracy in real time simulation for the valve base and station controllers which used in the project.
It fully consistent with the design and adjustment features testing for the demand of project.
Develop the digital simulation subsystem in order to achieve more application fields of AC network.
Increase the capability of converter in HVDC subsystem to meet the need of larger scale MMC-HVDC project.
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