IEEE Power & Energy Magazine - May/June 2019 - 62

the first project is a gigawatt-scale line-commutated converter
(lCC) hVdc system, which connects massive nuclear complexes
with a metropolitan area. this project will replace an originally
planned 765-kV transmission project that faced strong pub-
lic opposition because of siting concerns. the hVdc project
design offers environmental, public policy, and technical advan-
tages while also meeting reliability performance standards.
the second project consists of a modular multilevel con-
verter (mmC)-based voltage source converter (VsC)-hVdc
connection between the mainland and Jeju island. this proj-
ect will deliver bidirectional power flow and coordinate with
two existing lCC-hVdc ties.
the two new hVdc projects require complicated and novel
operating strategies. therefore, comprehensive feasibility
studies must be conducted that surpass the scope of feasibil-
ity studies commonly conducted for conventional technology.
many advanced planning and simulation methods and tools
were considered by the korea electric power Corporation
(kepCo) and partner universities to efficiently and accurately
achieve practical and credible solutions.
this article presents the imminent issues and challenges
for developing the future south korean electric power sys-
tem, the procedures used for enhancing public acceptance
of projects, and the studies conducted for addressing power
system stability problems. the article also describes inno-
vative methodologies for improving the accuracy of power
system planning results as well as the identification of plan-
ning upgrades that increase levels of power system transfers.

Transmission Line
765 kV

Unique Power System Infrastructure
of the Republic of Korea
the electric power system of the republic of korea, shown
in figure 1, is totally isolated from neighboring countries
because of political and geographical issues. its electric-
ity consumption per capita was 10,320 kwh/capita in 2017,
which exceeds that of most of the european countries that
have relatively larger land areas [see figure 2(a)]. Because
of the large amount of power generation and consumption
relative to population [see figure 2(b)], the generation and
transmission facilities in the republic of korea are densely
packed, with few opportunities for new greenfield sites. in
addition, the ratio of peak load relative to generation capac-
ity is high, as shown in figure 2(c).
the major generation complex (on the east coast) and load
center (around the capital, seoul, in the northwest) are approx-
imately 350 km apart and are connected by several 345-kV
lines and one 765-kV double circuit, as shown in figure 3.
kepCo plans to interconnect more bulk power plants in the
major generation area, such as nuclear and coal-fired genera-
tion plants in the east, which will increase the regional genera-
tion capacity from 7 to 22 gw by 2022.
Currently, even when a power plant is constructed, it is
difficult to build new transmission facilities because of social
acceptance. the contingency study shows that a severe distur-
bance (N-2) resulting in the loss of two of the existing 765-kV
lines would cause instability without tripping at least five
nuclear generators (totaling approximately 6,000 mw) through

Metropolitan Area
Major Generation Area

Ultrahigh Voltage
345 kV
Main Transmission System
154 kV
Serves Major Load Areas
dc Lines
Two HVdcs Connect the
Mainland to Jeju Island (130 km)
Substations
835 Substations
- 705 Without Personnel (84.4%)
(As of 31 October 2017)

Isolated Power Network From Neighboring Countries
43% of Power Demand in Seoul Metropolitan Area

figure 1. The electric power system of South Korea.
62

ieee power & energy magazine

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
IEEE Power & Energy Magazine - May/June 2019 - Cover2
IEEE Power & Energy Magazine - May/June 2019 - Contents
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