IEC 62927:2017/AMD1:2023
(Amendment)Amendment 1 - Voltage sourced converter (VSC) valves for static synchronous compensator (STATCOM) - Electrical testing
Amendment 1 - Voltage sourced converter (VSC) valves for static synchronous compensator (STATCOM) - Electrical testing
Amendement 1 - Valves de convertisseur source de tension (VSC) pour compensateur synchrone statique (STATCOM) - Essais électriques
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Standards Content (Sample)
IEC 62927
®
Edition 1.0 2023-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Voltage sourced converter (VSC) valves for static synchronous compensator
(STATCOM) – Electrical testing
Valves de convertisseur source de tension (VSC) pour compensateur synchrone
statique (STATCOM) – Essais électriques
IEC 62927:2017-07/AMD1:2023-05(en-fr)
---------------------- Page: 1 ----------------------
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IEC 62927
®
Edition 1.0 2023-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Voltage sourced converter (VSC) valves for static synchronous compensator
(STATCOM) – Electrical testing
Valves de convertisseur source de tension (VSC) pour compensateur synchrone
statique (STATCOM) – Essais électriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200; 29.240.99 ISBN 978-2-8322-6945-9
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62927:2017/AMD1:2023
© IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
VOLTAGE SOURCED CONVERTER (VSC) VALVES
FOR STATIC SYNCHRONOUS COMPENSATOR (STATCOM) –
ELECTRICAL TESTING
AMENDMENT 1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 62927:2017 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:
Draft Report on voting
22F/699/CDV 22F/721/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
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IEC 62927:2017/AMD1:2023 – 3 –
© IEC 2023
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
___________
2 Normative references
Replace the existing reference "IEC 60071-1:2006" and its title with the following new reference
and title:
IEC 60071-1:2019, Insulation co-ordination – Part 1: Definitions, principles and rules
4.1.5 Evidence in lieu
Add, in the second sentence of the existing paragraph, after the words "performing a type test",
the words "or individual parts of it".
4.1.6 Test object
Delete, in the first existing paragraph, the first sentence.
Delete, in the second sentence of the existing paragraph, the words "for those tests".
Table 1 – Minimum number of valve levels to be tested as a function of the number of
valve levels per valve
Replace, in the existing table, the header of the first column "Number of valve levels per valve"
with the new header "Number of valve levels, including redundant levels".
Add, in the third row of the existing second column, after the number "10", the word "valve".
Delete, in item c) of the existing paragraph, in the second sentence, the words "with the
agreement of the purchaser and supplier".
Replace, in the item d) of the existing paragraph, the verb "should" with "shall".
Add, after item d) of the existing paragraph, the following new paragraph:
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© IEC 2023
Subclause 4.1.6 does not apply to tests on the valve supporting structure and multiple valve
unit. The test object for those tests is defined in 7.2 and 8.3.
4.1.10 Conditions to be considered in determination of type test parameters
Replace, in the existing paragraph, the verb "should" with "shall".
4.4 Permissible component failures during type testing
Add, at the end of the existing third paragraph, the following new sentence:
Malfunction of valve level and component degrading detected in the routine test after type test
are deemed as faults shown by the rightest column of Table 2.
Table 3 – List of type tests
Delete, in the existing seventh row of the first column, the brackets "(optional)".
6.3 Test circuit
Add, after the existing second paragraph, the following new paragraph:
In order to reproduce correct heating effects, the operational test should be performed at the
service frequency. When the service frequency is different from the test frequency, then the
test conditions shall be adjusted so as to approximately compensate the difference in frequency
dependent losses, as necessary to demonstrate the proper stressing of the equipment.
6.4 Maximum continuous operating duty test
Add, in the existing second paragraph, at the start of the third bulleted list item, the words
"where snubbers are used,".
Add, in the existing third paragraph, at the start of the second bulleted list item, the words
"where snubbers are used,".
Add, at the start of the existing seventh paragraph, starting with "The test voltage U ", the
tpv1
text "In principle,".
Add, before the existing last paragraph, the following new note:
NOTE Test voltage for MMC valves can be defined by the operating voltage of the submodule capacitor. A test
safety factor of 1,05 is applied to the test voltage for MMC valves.
6.5 Maximum temporary overload operating duty test
Add, after the existing first paragraph, the following new paragraph:
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IEC 62927:2017/AMD1:2023 – 5 –
© IEC 2023
The test current shall be the specified overload current without a test safety factor.
Add, in the second sentence of the existing third paragraph, between "temporary" and
"operating", the word "overload".
Add, at the end of the last sentence of the existing third paragraph, the words "as a test safety
factor".
Add, at the end of the last sentence of the existing last paragraph, the words "as in 6.4".
7.2 Test object
Replace, in the first existing paragraph, the last sentence with the following new sentence:
The coolant shall be in a condition representative of the most onerous service conditions, except
for flow rate, which can be reduced.
7.3.3 Valve support lightning impulse test
Replace the existing third paragraph with the following new paragraph:
The peak test voltage shall be selected in accordance with the insulation co-ordination of the
STATCOM valve substation or selected from the standard lightning impulse withstand voltage
according to IEC 60071-1:2019, Table 2 or Table 3. When the latter is used, the transformer
secondary side (converter side) highest phase-to-phase voltage, instead of the STATCOM valve
highest voltage, shall be used as the highest equipment voltage to select the corresponding
lightning impulse peak.
8.3 Test object
Replace, in the first existing paragraph, the last sentence with the following new sentence:
The coolant shall be in a condition representative of the most onerous service conditions, except
for flow rate, which can be reduced.
8.4.3 MVU lightning impulse test
Replace the existing third paragraph with the following new paragraph:
The peak test voltage shall be selected in accordance with the insulation co-ordination of the
STATCOM valve substation or selected from the standard lightning impulse withstand voltage
according to IEC 60071-1:2019, Table 2 or Table 3. When the latter is used, the transformer
secondary side (converter side) highest phase-to-phase voltage, instead of the STATCOM valve
highest voltage, shall be used as the highest equipment voltage to select the corresponding
lightning impulse peak.
9.1 Purpose of the test
Delete, in the bulleted list item c) of the existing first paragraph, the word "and" and replace the
comma with a full stop.
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© IEC 2023
Delete the existing bulleted list item d).
Delete, at the start of the existing second paragraph, the words "It should be noted that".
9.2 Test object
Replace, in the existing second paragraph, the verb "should" with "shall".
9.3.3 Method 2
Add, at the end of the existing second paragraph, the following new text:
Insulation and partial discharge tests with AC, DC and/or combined AC-DC voltage shall be
performed on sub-component level (e.g., without power module electronics activated and
without capacitor) or on full submodule level. The aim is to test both insulation withstand
capability for every single sub-component and proofness of partial discharge for every sensitive
point within the valve level.
9.4.1.1 General
Add, after the existing first paragraph, the following new note:
NOTE A composite AC-DC test applies to the valve that is terminated between one DC terminal and one AC phase
similar to an HVDC converter.
9.4.1.2 Valve AC voltage test
Delete, in the existing first paragraph, the word "directly".
9.4.1.3 Valve AC-DC voltage test
Replace, in the existing fifth paragraph, the words "RMS value of valve AC-DC" with "valve".
Replace, in the existing sixth paragraph, under "30 min test", the three formulae with the
following new formula:
kU× 2 ×sin(2πft)
c2 max−cont
U +U ××kk
tv dmax o 7
3
Replace, in the existing key to the formulae, the description of notation "f" with the new
description "is the test frequency, Hz".
Add, in the existing key to the formulae, after the notation "f", the following new key and
description:
t is the time variable, s.
=
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IEC 62927:2017/AMD1:2023 – 7 –
© IEC 2023
9.4.2 Valve switching impulse test
Replace, in the first sentence of the first paragraph, the verb "should" with "shall".
10.2 Test object
Replace the existing paragraph with the following new paragraph:
Test object is described in 6.2. In case of controllable voltage source type VSC valves, this test
may also be performed on valve level. However, certain protection or monitoring circuits shall
be represented if they are essential for the detection of an overcurrent event.
10.3 Test requirements
Add, before the last existing paragraph, the following new paragraph:
Test voltage for MMC valves shall be defined by the operating voltage of the submodule
capacitor; it shall incorporate a test safety factor of 1,05.
Replace, in the last existing paragraph, the verb "should" with "shall".
12 Short-circuit current test (optional)
Delete, in the existing title, the brackets "(optional)".
12.1 Purpose of tests
Replace, in the second sentence of the existing second paragraph, the verb "should" with "shall.
Replace the last sentence of the existing second paragraph with the following new text:
Valve electronics shall normally be energized for the part of the fault event where any actions
are taken by it, for example, when blocking the IGBTs or turning on protective devices such as
bypass thyristors. For other parts of the fault event, it is not necessary to energize the valve
electronics.
12.3 Test requirements
Replace, in the second existing paragraph, the verb "should" with "shall".
13.4 Test requirements
Replace, in the existing third paragraph, the verb "should" with "shall".
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© IEC 2023
Annex B – Valve component fault tolerance
Add, at the end of item g) of the existing first paragraph, the following new text and note:
If the valve is liquid cooled, small leaks may not be easily detected. Escaped coolant can
contaminate sensitive components, leading to malfunction, and can increase the probability of
insulation failure. H
...
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