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Multi-Terminal DC system performance evaluation using
interconnected RTDS and OPAL RT System
S. Acharya, A. Azidehak, M. Kashani, G. Chavan, K. Vechalapu, S. Bhattacharya
Objectives
2.262 KV 3 Phase AC grid
2.262 KV 3 Phase AC grid
cable
AC-DC
Station
AC-DC
Station
(MMC)
TR#3
TR#1
cable
cable
Recently Multi-terminal DC (MTDC) systems have received more attention in the power transmission areas.
Development of modular structured power converter topologies has now enabled the power converter
technology to attain high voltage high power rating. This prompted a change in the HVDC technology based on
Voltage Source Converters.
ADVANTAGES:
 For long distance power transmission HVDC yields more economical performance compared to an
Equivalent AC system.
 Voltage Source Converter based terminals can provide flexibility in terms of active and reactive power
Requirements for the AC grid.
Module 1
2.262 KV 3 Phase AC grid
Module 2
AC-DC
Station
cable
12 KV DC
GRID
TR#2
Module 3
Module 4
SOLAR CONVERTER and BESS
TR#4
SOLAR FARM
(Capacity 5 MW)
ON RTDS
ON OPAL RT
4-Terminal MVDC System
Challenges / Features
 From the system control point of view it is imperative that the MTDC system control
as well as the individual terminal controls are validated.
 Real time simulation platforms such as RTDS, OPAL RT gives a good platform to
Validate the control of the system.
 But as the system keeps getting bigger the computation requirements goes high.
 Therefore interconnection between tow real time simulation platforms will provide
flexibility in terms of system expansion.
Voltage Source Converter configuration with high frequency link DC/DC converter
L1
Synchronization Technique
Vout
Vpv
SM
SM
SM
SM
SM
AC
Dual Active Bridge
PV system
SM
AC
DC
Lboost
AC
Point to Point synchronization.
Global synchronization using GPS
Iess
Vbattery
GPS
OPAL
RTDS
GTSYNC
1 PPS
RTDS
IRIG/GPS
GTSYNC
RTDS to OPAL RT sync (1 PPS signal is sent
via BNC cable)
OPAL
1 PPS
Modular DC/DC converter for integrating the PV with the
DC grid.
IRIG/GPS
Synchronization using GPS
SM
SM
SM
SM
SM
Standard MMC with half bridge sub modules
RTDS
4 Terminal MTDC System Dynamic Performance
T2 SM Capacitor Voltages
OPAL RT
Integrator outputs
Bidirectional
Boost
ESS system
Converter
SM
T1 SM Capacitor Voltages
PV Power start
insertion
PV Power start
insertion
Simulator Platform Setup
Time (sec)
RTDS
Terminal 1 AC currents
AC Currents (KA)
AC Currents (KA)
Time (sec)
Time (sec)
MMC Terminal Voltage and Current
Voltage (KV)
Voltage (KV)
Current (KA)
PV Terminal Voltage and Current
Current (KA)
Figure 2: RTDS and OPAL RT interconnected system
set up
PV Power start
insertion
Time (sec)
Terminal 2 AC currents
OPAL RT
Power Dynamics
DC Power (W)
Resettable Integrators running synchronously in
both the systems
VOLTAGE (KV)
Integrator turned on in both the systems
VOLTAGE (KV)
Time (sec)
Time (sec)
Time (sec)
Time (sec)
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