# IEEE Power & Energy Magazine - May/June 2019 - 28

```table 3. The loading limit following ac-to-dc line conversion.
AC Voltage (kV)

Conductor Type

Length
(mi/km)

Thermal
Rating (A)

Limit (MW)

DC Voltage
(kV)

Limit (MW)

Capacity
Increase (%)

138

1192 ACSR

16/25.8

1,500

150
(3 × SIL)

100

300

100

230

2-1351.5 ACSR

72/115.9

2,702

290
(2 × SIL)

200

1,081

273

345

2-2493 ACAR

177/284.9

3,480

560
(1.4 × SIL)

320

2,227

298

500

3-1351 ACSR

250/402.3

4,179

1,200
(1.2 × SIL)

400

3,343

179

102

101
Send
↓

38%
(188 MW)
38%
(188 MW)

↓

264 MW

880 MW
229.9 kV
23%
(113 MW)↓
103

229.4 kV

↓

616 MW

Outaged Line
101%
(502 MW)

230 kV

Note:

figure 9. Sample system 1.

Planning
Considerations

102

101
Send
← 100%
(500 MW)
← 100%
(500 MW)

645 MW

1,500 MW

230 kV
← 100%
(500 MW)

355 MW
103

855 MW
230 kV

Outaged Line
230 kV

Note:

figure 10. Sample system 1 following ac-to-dc line conversion.
28

Table 3 shows the compari-
ing of the ac line and the potential
based on the previous voltage
selection. For the purpose of this
limit was calculated by multiply-
ing by the appropriate factor
based on the line length. There
is a significant capacity increase
when the line is converted to dc for
all voltage levels. lines longer than
50 mi (80.5 km) are generally lim-
ited by voltage or stability, but the
goal of this exercise is to illustrate
the increase in thermal capacity by
the ac-to-dc conversion.

ieee power & energy magazine

This section examines system
planning considerations, with the
objective of identifying candidate
ac transmission lines that could
benefit from an ac-to-dc conver-
sion. The thermal limit of an in-
dividual circuit is not the only
consideration when identifying
the power transfer capability of a
given corridor, flow gate, or path.
The transmission capacity must
be assessed under outage condi-
tions as well.
When considering the n-1 cri-
teria, the power transfer increase
for a given path also depends on
the parallel paths. This is illus-
trated in Figure  9, which shows
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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