IEC 62751-1:2014/AMD2:2022
(Amendment)Amendment 2 - Power losses in voltage sourced converter (VSC) valves for high-voltage direct current (HVDC) systems - Part 1: General requirements
Amendment 2 - Power losses in voltage sourced converter (VSC) valves for high-voltage direct current (HVDC) systems - Part 1: General requirements
Amendement 2 - Pertes de puissance dans les valves à convertisseur de source de tension (VSC) des systèmes en courant continu à haute tension (CCHT) - Partie 1: Exigences générales
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IEC 62751-1 ®
Edition 1.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
Power losses in voltage sourced converter (VSC) valves for high-voltage direct
current (HVDC) systems –
Part 1: General requirements
Pertes de puissance dans les valves à convertisseur de source de tension (VSC)
des systèmes en courant continu à haute tension (CCHT) –
Partie 1: Exigences générales
IEC 62751-1:2014-08/AMD2:2022-03(en-fr)
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IEC 62751-1 ®
Edition 1.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 2
AM ENDEMENT 2
Power losses in voltage sourced converter (VSC) valves for high-voltage direct
current (HVDC) systems –
Part 1: General requirements
Pertes de puissance dans les valves à convertisseur de source de tension (VSC)
des systèmes en courant continu à haute tension (CCHT) –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200; 29.240.99 ISBN 978-2-8322-1087-6
– 2 – IEC 62751-1:2014/AMD 2:2022
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER LOSSES IN VOLTAGE SOURCED CONVERTER (VSC) VALVES
FOR HIGH-VOLTAGE DIRECT CURRENT (HVDC) SYSTEMS –
Part 1: General requirements
AMENDMENT 2
FOREWORD
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Amendment 2 to IEC 62751-1:2014 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/648/CDV 22F/679/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.
IEC 62751-1:2014/AMD 2:2022 – 3 –
© IEC 2022
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.
___________
1 Scope
Add, to the last sentence of the first existing paragraph, the words "or unified power flow
controller (UPFC)".
3.4.2
IGBT turn-on energy
Replace, in the existing definition, the words "turn-on of" with "turn-on process for".
3.4.3
IGBT turn-off energy
Replace, in the existing definition, the words "turn-off procedure of" with "turn-off process for".
3.4.5
diode reverse recovery energy
Replace, in the existing definition, the word "procedure" with "process".
4.1 General
Replace the existing last paragraph with the following new paragraph:
This standard standardizes a method of calculating the HVDC converter station losses by
summing the losses calculated for each item of equipment. The standardized calculation
method will help the purchaser to meaningfully compare the competing bids. It will also allow
an easy generation of performance curves for the wide range of operating conditions in which
the performance has to be known. In the absence of an inexpensive and accurate experimental
method which could be employed for an objective verification of losses during type tests, the
calculation method is the next best alternative as it uses, wherever possible, experimental data
obtained from measurements on individual equipment and components under conditions
equivalent to those encountered in real operation.
4.4.1 General
Replace the existing paragraph with the following new paragraphs:
When power losses are being calculated for the purposes of determining the worst-case ratings
of individual components or equipment (for example, the cooling plant), the worst possible
– 4 – IEC 62751-1:2014/AMD 2:2022
© IEC 2022
combination of a.c. network conditions, ambient conditions and real/reactive power (including
overload) shall be considered.
When power losses are being calculated for the purpose of contractual loss guarantees, it is
important that a standard set of assumptions with regard to a.c. network conditions, ambient
conditions and real/reactive power are made so that bids from different manufacturers can be
compared on an equal basis. Purchasers of HVDC systems may specify their own standard
reference conditions for atmospheric pressure, ambient temperature, humidity, coolant
temperature, power transmission level, etc., at which the power losses are to be determined.
Where the purchaser does not specify such reference conditions, losses shall be determined
under the following default conditions.
4.4.5 Treatment of redundancy
Add, in the existing note, the word "generally" before "occur".
4.5.3.2 Characterisation testing of other components
Add, to the existing first bulleted list item, the words "on DC capacitor".
Add, after the existing last bulleted list item, the following new item:
• power consumption of valve electronics.
8.2 IGBT switching losses
Delete, in the paragraph preceding immediately Formula (11), the words "which is
recommended to be one second".
Add, at the end of 8.2, modified by IEC 62751-1:2014/AMD1:2018, the following new text:
The sampling period t should be chosen to represent a period of time in which the converter is
s
operating in normal, steady-state conditions with no transient phenomena such as power order
changes, network faults, etc.
A typical value of sampling period is one second; however, the choice of sampling period shall
take into account the specific type of modulation strategy employed and how predictable the
resulting switching pattern is. For example, if a pulse width modulation (PWM) control strategy
is used, the switching pattern may be relatively predictable, and a sampling time shorter than
1 s may be acceptable, but certain control strategies may require a sampling period longer than
1 s.
Table 1 – Matrix indicating the relationship of data needed for
...
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