IEC TR 60919-1:2010/AMD2:2017

IEC TR 60919-1 ®
Edition 3.0 2017-05
TECHNICAL
REPORT
AMENDMENT 2
Performance of high-voltage direct current (HVDC) systems with line-
commutated converters –
Part 1: Steady-state conditions

IEC 60919-1:2010-05/AMD2:2017-05(en)

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IEC TR 60919-1 ®
Edition 3.0 2017-05
TECHNICAL
REPORT
AMENDMENT 2
Performance of high-voltage direct current (HVDC) systems with line-

commutated converters –
Part 1: Steady-state conditions

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200; 29.240.99 ISBN 978-2-8322-4351-0

– 2 – IEC TR 60919-1:2010/AMD2:2017

© IEC 2017
FOREWORD
This amendment has been prepared by subcommittee 22F: Power electronics for electrical

transmission and distribution systems, of IEC technical committee 22: Power electronic

systems and equipment.
The text of this amendment is based on the following documents:

DTR Report on voting
22F/447/DTR 22F/452/RVDTR
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
_____________
3 Types of HVDC systems
3.3 Monopolar earth return HVDC system
Replace the existing title by the following new title:

3.3 Monopolar HVDC system with earth return
Replace, in the first paragraph, the words "monopolar earth return system" by "monopolar
HVDC system with earth return".
Figure 3 – Monopolar earth return system
Replace the existing title by the following new title:
Figure 3 – Monopolar HVDC system with earth return

3.4 Monopolar metallic return HVDC system
Replace the existing title by the following new title:

© IEC 2017
3.4 Monopolar HVDC system with metallic return

Add, after the fourth paragraph, the following new paragraph:

For metallic return scheme, DC fault current will flow into AC system and come back through

neutral point of transformers installed in the converter station. This current may lead to the

malfunction of protective relays installed in nearby stations, caused by the saturation of cores

due to DC current. To prevent such malfunctions, insertion of neutral grounding resistor (small

resistance) to transformers in converter station will be effective.

Figure 6 – Monopolar metallic return system

Replace the existing title by the following new title:
Figure 6 – Monopolar HVDC system with metallic return
3.5 Bipolar HVDC system with earth return
Replace, in the first paragraph, "Figure 7" by "Figure 7 (a)".
Figure 7 – Bipolar system
Replace the existing Figure 7, modified by IEC TR 60919-1/AMD1:2013, by the following new
figure.
– 4 – IEC TR 60919-1:2010/AMD2:2017

© IEC 2017
I
d
(+)/(-)
1 1
2 F F 2
U
d
3 3
U
d
2 F F 2
(–)/(+)
1 1
IEC
Figure 7 (a) – Bipolar HVDC system with earth return
I
d
(+)/(-)
1 1
2 2
F F
U
d
2 2
F F
(-)/(+)
1 1
IEC
Figure 7 (b) – Rigid bipolar HVDC system

© IEC 2017
Key
1 DC reactor
2 DC filter
3 Earth electrodes
Figure 7 – Bipolar system
Add, after the fourth paragraph, the following new paragraph:

Most of the HVDC system utilises electrode line or metallic return conductor (cable) for d.c.

current return path. However, as far as the balanced bipolar operation is always assured,

these facilities can be eliminated. This scheme is called "rigid bipole HVDC system"
configuration, as shown in Figure 7 (b). With this scheme, operation modes are limited but
installation cost can be reduced.
3.6 Bipolar metallic return HVDC system
Replace the existing title by the following new title:
3.6 Bipolar HVDC system with metallic return
Replace, in the first sentence of the first paragraph, the words "bipolar metallic return HVDC
system" by "bi
...