IEEE Power & Energy Magazine - May/June 2019 - 71

P (p.u.)

figure 12 shows the results from the full rts and the understand the effects of the emerging equipment, refine the
hs. the red lines represent the result from rts, and the grid requirements, and develop optimal network expansion
blue lines represent the result from the hs. the results show and operational strategies.
Because the mmC-hVdc will play an important role in
nearly the same outcomes for the single-line and three-phase
faults. An appropriate boundary selection allows the hs to the Jeju power system, an analysis will be conducted using the
perform similarly to an rts and requires only a small num- hs to address some technical issues, including low-frequency
ber of processors to configure the entire power system net- oscillation, harmonics, and voltage imbalance concerns; hVdc
work, including detailed power electronic device models. in frequency control; dc fault-blocking capability; and hVdc
addition, the hs significantly shortens the preparation time recovery after ac contingency. the efficacy and the accuracy
of continuous data exchange between the tsA tool and rts in
to configure the simulation case.
the cases for a 765-kV double-circuit contingency near the hs will be continuously examined.
the hVdc and generator tripping were established to compare
results between the tsA tool and the hs, as shown in figure 13. Outlook for Feasibility Study of HVdc
As shown in figure 14, the results of the tsA of a 765-kV dou- Projects in the Republic of Korea
ble-circuit contingency near the hVdc with the hs are quite dif- Currently, the republic of korea is going through a huge tran-
ferent from those of the tsA tool with the generic hVdc model. sition in its power system to increase public acceptance
Accurate analysis is required to identify both technically and of system expansion and address environmental concerns.
economically feasible mitigation
or correction measures to ensure
noninterruptible power transfer to
TSA
the metropolitan area. it is interest-
ing to note that pure tsA studies
TSA
RTS
STATCOM
show that the system is stable with
RTS
1.5 GW
four generators tripped, whereas
the results from the hs find that the
stable system response occurs by
LCC HVdc
tripping only three generators. the
hs incorporates the emt model of
the hVdc and runs with the same
345 kV
tsA model for the remaining net-
765 kV
HVdc
345 kV
work. therefore, it assists engineers
765 kV
in identifying a cost-effective reme-
HVdc
dial action scheme for the same con-
tingency. As the network informa-
tion is updated and the models are figure 13. A representation of RTS and the TSA boundary for performing 765-kV doublecircuit contingency near HVdc to compare performance between full RTS and the HS.
refined, the scheme requires more
rigorous and continuous investiga-
tion based on many other credible
HVdc Power Comparison
scenarios. however, the project team
TSA With Three Generators Tripped
has made an interesting observation
1
TSA With Four Generators Tripped
and learned an important lesson
HS With Three Generators Tripped
regarding the importance of model-
0.8
ing and its implications in the analy-
sis and consequent decision making.
0.6
the hs is currently being adopt-
ed for investigating the mmC-
0.4
hVdc project in the Jeju power
system. the project team is build-
0.2
ing various planning cases that
successfully incorporate the detail
0
dynamics and interaction between
9
10
0
1
2
3
4
5
6
7
8
the existing two lCC-hVdcs and
Time (s)
the expected mmC-hVdc and the
expected wind farm. the use of the figure 14. The simulation result comparison between the TSA tool and the HS
hs should help grid planners better under the 765-kV double-circuit contingency.
may/june 2019

ieee power & energy magazine

71



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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IEEE Power & Energy Magazine - May/June 2019 - Cover3
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