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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Status
Published
Publication Date
15-Mar-2022
Current Stage
PPUB - Publication issued
Completion Date
16-Mar-2022
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IEC 62751-1:2014/AMD2:2022 - Amendment 2 - Power losses in voltage sourced converter (VSC) valves for high-voltage direct current (HVDC) systems - Part 1: General requirements
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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)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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 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

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,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

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

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

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

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

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 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.
---------------------- Page: 4 ----------------------
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

---------------------- Page: 5 ----------------------
– 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

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 calculation of losses and

the type of valve losses

Add, in the "Characterisation testing" column, the crosses corresponding to "Snubber turn-on

energy E " and "Snubber turn-off energy E ".
sn_on sn_off

Delete, in the "Specified by VSC manufacturer" column, the crosses corresponding to "Snubber

turn-on energy E " and "Snubber turn-off energy E ".
sn_on sn_off
A.1 General
Add, at the beginning of the existing first paragraph, the following new text:

CIGRE WG B4-75 has published Technical Brochure 844 which discusses several possible

experimental methods for determining valve losses. In some special circumstances, it may be

---------------------- Page: 6 ----------------------
IEC 62751-1:2014/AMD 2:2022 – 5 –
© IEC 2022

possible, for example, to arrange a temporary test connection in which two converters are

operated from the same a.c. source and also connected together via their d.c. terminals. In this

connection, the power drawn from the a.c. source equals the losses in the circuit. However, this

method requires additional instrument transformers and switchgear and is only possible where

there are two identical converters connected to the same AC system at the same site. Once

again, there are practical measurement difficulties. It is also possible to arrange for a direct

thermal measurement of the valve losses on site by measuring the temperature rise of the valve

coolant fluid; however, this method does not capture all sources of power loss in the valve and

the achievable accuracy, with the flow and temperature sensors typically installed on site, is

relatively poor. Another alternative is to perform a thermal or electrical measurement of the

losses in the valve during type testing, but this method is also challenging to perform with

sufficient accuracy because the voltage and current waveforms experienced by the test object

are not identical to those experienced during real service conditions.
A.2.3 Line side harmonic filter
Replace, in the first sentence of the existing paragraph, modified by IEC 62751-

1:2014/AMD1:2018, the reference "IEC 61803:1999 and IEC 61803:1999/AMD1:2010" with

"IEC 61803:2020".
A.2.4 Line side high frequency filter

Replace, in the existing paragraph, modified by IEC 62751-1:2014/AMD1:2018, the reference

"IEC 61803:1999 and IEC 61803:1999/AMD1:2010" with "IEC 61803:2020".
A.2.5 Interface transformer

Replace, in the existing second paragraph, modified by IEC 62751-1:2014/AMD1:2018, the

reference "IEC 61803:1999, IEC 61803:1999/AMD1:2010 and IEC 61803:1999/AMD2:2016"

with "IEC 61803:2020".
A.2.8 Phase reactor
Replace, in the existing first paragraph, modifi
...

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