IEEE Power & Energy Magazine - May/June 2019 - 30

235 MW
103
Load 2
229.1 kV

102
Load 1

101
Send

← 150.2 MW
← 65.5 MW
← 548.5 MW

1,002

570 MW
230 kV

← 150.2 MW
1,001

134.4 kV

819 MW

138 kV
230 kV

138 kV

Proposed Ranking of
Conversion Options
in a Large System

figure 13. Sample system 3 with multiterminal solution.

Bus 17

30 Bus 18
31
28

Bus 23

24
25

23

26

36

35
Bus 20

Bus 19

Bus 15

Bus 22

38

34

29

Bus 16
230 kV

Bus 21

33

32

37
22

Bus 14

21

Bus 13

18
27

20

19
Bus 24

14
Bus 3

16

15

2

Bus 4

3

17

Cable
1
Bus 1

Bus 6

Bus 10
Cable
10

Bus 9

6
8 Bus 5

138 kV

Bus 12

Bus 11

7

13

9
5

4

Bus 8

12

Bus 2

11
Bus 7

Candidate Lines for ac-dc Line Conversion

figure 14. The candidate lines for ac-to-dc conversion in the IEEE 24-bus reliability
test system.
30

ieee power & energy magazine

if we take this one step further,
a multiterminal hVdc solution,
as in Figure 13, would allow the
system planner to mitigate several
congestion modes, such as outages
on the hV bulk system and the
resulting overload of underlying
elements. it would also allow the
operator to balance the export and
import power between 2 × 138-kV
line feeders. Vsc multiterminal
controls use a single terminal con-
trolling the voltage while the oth-
ers control power, which ensures
power balance at the generator
connected to the dc line.

it is clear that an ac-to-dc line con-
version can provide a significant
increase in the system operating
limit, which makes it an attractive
solution for large systems experienc-
ing congestion. however, the system
planner will be faced with several
potential solutions and options.
The authors propose a meth-
odology to rank the candidate
transmission lines for conver-
sion based on their impact on
the system power flow in steady
state. The proposed line-ranking
factor is calculated by consider-
ing the sensitivity of the power
flow through the overloaded ele-
ment to changes in the power flow
in any other given line, under
the most critical contingencies.
a high sensitivity indicates that
the changes in the power f low
of a specific line would have the
highest impact on controlling the
power flow through an overloaded
line or path.
This ranking methodology is
explained in Figure 14 using the
ieee 24-bus reliability test system.
For the outage of the 230-kV line
27, the limiting element is identi-
fied to be line 19. Therefore, the
distribution factors for each of
the system lines with respect to
line 19 must be calculated under
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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