IEEE Power & Energy Magazine - May/June 2019 - 68

Cosimulation

RTS

penetration level of renewables.
research on hVdc role allocation
and coordination control is also
needed. in this complex operating
situation, a feasibility study with
hybrid simulation proved useful
for kepCo planners.

TSA

EMT-TSA
Grid Sync
RTS
EMT

Economic Wide
Area Study

els

Mod

Utilizing EMT Models

figure 7. The concept of the HS.

1 ms

2 ms

3 ms

4 ms

1 ms

2 ms

3 ms

4 ms

TSA
FPGA
RTS

figure 8. The clock synchronization for matching TSA tool
simulation in real time with the RTS.

TSA

Mode

ls

Development of Hybrid
Simulator Tool

to overcome the aforementioned
technical issues and achieve more
accurate simulation results, kepCo,
powertech labs, and Yonsei Uni-
versity jointly developed a hybrid
simulator (hs). this platform syn-
thesizes tsA with the rts to per-
form cosimulation studies, as shown in figure 7. this approach
of interleaving either offline or real-time emt simulation with
tsA has been explored by researchers in several countries
in the past several decades to help engineers simulate much
larger systems while reducing the cost, effort, and time needed
to set up and run the system. Additionally, the engineer can
analyze the aspects of system dynamic behavior that were pos-
sibly missed in a pure emt or tsA study. the value of such
simulation has been acknowledged by some entities, and these
studies have successfully produced a meaningful outcome to
realize the idea of cosimulation.

Fast and Efficient Simulation
the rts uses a powerful computing processor. it performs
transient simulations with inputs and outputs to external hard-
ware in real time and can communicate in nanoseconds using
fiber-optic communication. the tsA tool allows for fast and
accurate computation for large power systems using a fast
computation algorithm, and the tool offers a user-friendly
interface with the rts. the hs can conduct rts by tsA and
rts interleaving buffer memory of a field-programmable gate
array (fpgA). As shown in figure 8, tsA and rts access
fpgAs at every time step to interchange solutions because the
correct timing and synchronization of data exchange between
the tsA and rts platform are critically important in hs.
Small Internal Area
Medium Internal Area
Large Internal Area

figure 9. The boundary selection for dividing internal and
external areas for accurate simulation.

recovery of the hVdc after an ac fault, a dc fault, or a com-
mutation failure. Although the synchronous generators in
Jeju provide ac voltage regulation, the number of must-run
synchronous generators needs to be reduced to increase the
68

ieee power & energy magazine

Convenient Simulation
A system-wide impact analysis is needed for planning the
hVdc system. however, this would involve large hardware
requirements to meet the computation needs using only rts.
the hs classifies the area of interest simulated with the rts as
the internal system and the remaining system simulated with
the tsA tool as the external system. this process significantly
reduces the time required for modeling each component of the
power system on the emt level because most models used in
the tsA tool can be utilized directly. moreover, it allows a sig-
nificant reduction in the number of rts processors required to
perform studies.
may/june 2019



IEEE Power & Energy Magazine - May/June 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2019

Contents
IEEE Power & Energy Magazine - May/June 2019 - Cover1
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