IEEE Power & Energy Magazine - May/June 2019 - 72

Pure TSA studies show that the system is stable with four generators
tripped, whereas the results from the HS find that the stable system
response occurs by tripping only three generators.

several hVdc projects are planned to be built in conjunc-
tion with numerous fACtss to reinforce the power transfer
capability and reliability, mitigate operational risks in the
mainland, and integrate massive renewable energy growth
on Jeju island. in this situation, the planners have to carry
out various feasibility studies with several tools and weigh
the results of studies against each other, and these studies
should be resolved as existing power systems evolve into
future power grids where power electronics-based compo-
nents dominate networks.
the temporary overload performance of hVdc and fACts
should be considered as options to stabilize the power sys-
tem and prevent cascading blackouts. this study, which was
conducted using various tools, provides valuable insights into
planning a power system with fast yet sophisticated convert-
ers. however, the accuracy of the results is not yet sufficient
to make a firm conclusion. the feasibility study of the mmC-
hVdc, which connects the mainland and Jeju island for flex-
ible power transfer, also requires more than just the conven-
tional approach. Because modeling at the tsA level cannot
capture the unique and crucial dynamics and features of
mmC in harmony with the two existing lCCs, the hs should
be useful in complementing the insights provided by the pure
tsA-based, system-wide feasibility studies. Advanced mod-
eling with the hs should help grid planners better define the
grid requirements of the emerging equipment. such model-
ing is also beneficial from the manufacturers' perspective
because it provides clear design criteria, which avoids unnec-
essary conflicts after delivering the equipment to kepCo
planners. the project team will continue making efforts to
improve their planning practices for meeting the upcoming
changes and challenges of the future power grid and for fully
exploiting the opportunities.

Acknowledgments
this work was supported by the korea electric power Cor-
poration (grant number r17XA05-4). this work was also
supported by the human resources program in energy
technology of the korea institute of energy technology
evaluation and planning, granted financial resource from
the ministry of trade, industry & energy, republic of
korea (number 20174030201540).

For Further Reading
n. r. watson and J. Arrillaga, Power Systems Electromagnetic Transients Simulation. london: iet, 2003.
72

ieee power & energy magazine

J. Arrillaga, Y. h. liu, and n. r. watson, Flexible Power
Transmission: The HVDC Options. hoboken, nJ: wiley, 2007.
J. Arrillaga and B. smith, AC-DC Power System Analysis. herts, United kingdom: iee press, 1998.
IEEE Guide for Planning DC Links Terminating at AC
Locations Having Low Short-Circuit Capacities, Part I:
AC/DC System Interaction Phenomena, ieee standard
1204-1997, 1997. [online]. Available: http://ieeexplore.ieee.
org/document/653230/
X. lin, A. m. gole, and m. Yu, "A wide-band multi-port
system equivalent for real-time digital power system simula-
tors," IEEE Trans. Power Syst., vol. 24, no. 1, pp. 237-249,
feb. 2009.
Y. liang, X. lin, A. m. gole, and m. Yu, "improved
coherency-based wide-band equivalents for real-time digi-
tal simulators," IEEE Trans. Power Syst., vol. 26, no. 3, pp.
1410-1417, July 2011.
C. kim, V. sood, g. Jang, s. lim, and s. lee, HVDC
Transmission: Power Conversion Applications in Power
Systems. hoboken, nJ: wiley, 2009.

Biographies
Sehyun Kim is with Yonsei University, seoul, republic of
korea.
Heejin Kim is with Yonsei University, seoul, republic
of korea.
Hyunjae Lee is with Yonsei University, seoul, republic
of korea.
Jihoon Lee is with Yonsei University, seoul, republic
of korea.
Byongjun Lee is with korea University, seoul, republic
of korea.
Gilsoo Jang is with korea University, seoul, republic
of korea.
Xi Lin is with powertech labs inc., surrey, Canada.
Taekyun Kim is with kepCo electric power research
institute, daejeon, republic of korea.
Donghoon Jeon is with kepCo electric power re-
search institute, daejeon, republic of korea.
Yonghak Kim is with kepCo electric power research
institute, daejeon, republic of korea.
Jaegul Lee is with kepCo electric power research in-
stitute, daejeon, republic of korea.
Kyeon Hur is with Yonsei University, seoul, republic of
korea.
p&e

may/june 2019


http://www.ieeexplore.ieee.org/document/653230/ http://www.ieeexplore.ieee.org/document/653230/

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