IEC 61803:1999/AMD2:2016
(Amendment)Amendment 2 - Determination of power losses in high-voltage direct current (HVDC) converter stations with line commutated converters
Amendment 2 - Determination of power losses in high-voltage direct current (HVDC) converter stations with line commutated converters
Amendement 2 - Détermination des pertes en puissance dans les postes de conversion en courant continu à haute tension (CCHT) munis de convertisseurs commutés par le réseau
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IEC 61803 ®
Edition 1.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 2
AM ENDEMENT 2
Determination of power losses in high-voltage direct current (HVDC) converter
stations with line commutated converters
Détermination des pertes en puissance dans les postes de conversion en
courant continu à haute tension (CCHT) munis de convertisseurs commutés par
le réseau
IEC 61803:1999-02/AMD2:2016-05(en-fr)
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IEC 61803 ®
Edition 1.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AM ENDMENT 2
AM ENDEMENT 2
Determination of power losses in high-voltage direct current (HVDC) converter
stations with line commutated converters
Détermination des pertes en puissance dans les postes de conversion en
courant continu à haute tension (CCHT) munis de convertisseurs commutés par
le réseau
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-3358-0
– 2 – IEC 61803:1999/AMD2:2016
© IEC 2016
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:
CDV Report on voting
22F/374/CDV 22F/393A/RVC
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• withdrawn,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.
_____________
CONTENTS
5.9 Series filter losse
Replace the entry as follows (to correct the misprint):
5.9 Series filter losses
3.1.1
auxiliary losses
Replace the existing definition by the following new definition and new note:
electric power required to feed the converter station auxiliary loads
NOTE 1 to entry: The auxiliary losses depend on the number of converter units used and whether the station is in
no-load operation or carrying load, in which case the auxiliary losses depend on the load level.
3.1.2
no-load operation losses
Replace the term and its definition as follows:
© IEC 2016
3.1.2
equipment no-load operation losses
losses produced in an item of equipment with the converter station energised but with the
converters blocked and all station service loads and auxiliary equipment connected as
required for immediate pick-up of load to specified minimum power
3.1.4
operating losses
Replace the existing term by the following new term:
3.1.4
equipment operating losses
3.1.5
rated load
Replace the existing definition by the following new definition and note:
load related to operation at nominal values of d.c. current, d.c. voltage, a.c. voltage and
converter firing angle
Note 1 to entry: The a.c. system shall be assumed to be at nominal frequency and its 3-phase voltages are
nominal and balanced. The position of the tap-changer of the converter transformer and the number of a.c. filters
and shunt reactive elements connected shall be consistent with operation at rated load, coincident with nominal
conditions.
3.1.6
total station losses
Replace the existing term and its definition by the following new term, definition and notes:
3.1.6
total station operating losses
sum of all equipment operating losses (3.1.4) and corresponding auxiliary losses (3.1.1) at a
particular load level
Note 1 to entry: It is recognised that some purchasers evaluate “total station no-load operation losses” (definition
3.1.8) and total station load losses individually instead of the evaluating “total station operating losses” (definition
3.1.6).
Note 2 to entry: "Operating losses” minus “no-load operation losses” may be considered as being quantitatively
equivalent to “load losses” as in conventional a.c. substation practice.
Note 3 to entry: An illustrative example to derive “load losses”, “equivalent load losses” and corresponding “loss
evaluation” is given in Annex D.
3.1.7
station essential auxiliary load
Delete, in the definition added by Amendment 1, the Note.
– 4 – IEC 61803:1999/AMD2:2016
© IEC 2016
Insert, between 3.1.5 and 3.1.6 the following new entry 3.1.8:
3.1.8
total station no-load operation losses
sum of all equipment no-load operation losses (3.1.2) and corresponding auxiliary losses
(3.1.1)
3.2 Letter symbols
Replace the definition of letter symbol α modified by Amendment 1, as follows:
α (trigger/firing) delay angle, in radians (rad)
4.1 Introduction
Delete, in the third sentence of the second paragraph, the additional blank spaces (misprint).
4.3 Operating parameters
Replace the second paragraph as follows:
The losses of HVDC converter stations are classified into two categories, referred to as
operating losses (3.1.4 and 3.1.6) and no-load operation losses (3.1.2 and 3.1.8).
Add, to the last sentence of the subclause, the phrase "(without waiting for tap changer
movement) to specified minimum power" as follows:
Station service loads and auxiliary equipment (e.g. cooling water pumps) shall be assumed to
be connected as required for immediate pick-up of load for the converter station (without
waiting for tap changer movement) to specified minimum power.
5.1.7 Turn-off losses per valve
Replace the first sentence of the subclause as follows:
These are additional losses due to reverse current flow in the thyristors at turn-off (see Figure
8).
Renumber the Note as Note 1 and add the following Note 2 at the end of the subclause:
NOTE 2 The most part of the thyristor turn-off losses resulting from this mechanism are dissipated within the
thyristor itself, although part of the losses may be dissipated in other components such as the damping resistor and
valve reactor.
© IEC 2016
5.2.2 No-load operation losses
Add, after the paragraph, the following new paragraph:
The transformer tap-changer position shall be as defined in 4.3.
Annex B – Typical station losses
Replace, in the table, the first line starting with "Thyristor valves" as follows:
Item Typical losses at nominal operating conditions
%
Thyristor valves 20 – 40
Replace the sentence under the table as follows:
The total station no-load operation losses range from 10 % to 20 % of the total station
operating losses at rated power under nominal operating conditions.
Add, between Annex B and Annex C, the following new Annex D:
– 6 – IEC 61803:1999/AMD2:2016
© IEC 2016
Annex D
(informative)
HVDC converter station loss evaluation – An illustration
This annex is included to provide an illustration only to describe the basic concept behind the
loss evaluation of HVDC converter stations and is to be considered by readers as a guide
only.
One of the purposes of HVDC converter station loss determination is to evaluate expected life
time cost of associated electrical losses reasonably well; not the maximum losses at any time.
This is also a mechanism to arrive at an optimum compromise between initial capital
investment cost and life time operating cost associated with electrical losses. Actions which
take very little time (like few seconds when moving a tap changer) are basically irrelevant in
this aspect of evaluating losses as this is to cover a very long period (like 25 years). Similarly,
events which last for a short duration should be disregarded for purpose of loss evaluation
(e.g. maximum ambient temperature, instead of use of yearly average ambient temperature to
be considered). Further, considering operating loss at full load only may not represent the
losses corresponding to actual load curve of most of HVDC systems. Hence a realistic method
is recommended to be considered by adopting suitable weighting factors to a few sets of load
as per expected loading patterns of the particular HVDC transmission link over a long period.
Cost of losses is associated between average price per hour of electricity, the interest rate
applicable and design life of the HVDC project. The following formula is an example:
−L
11− +R
( )
L CE×T
R
where
CE is the cost of 1 kWh of electric energy at the present value ($);
T is the number of hours in a year that the HVDC equipment is expected to be in
operation (hours);
R is the interest rate applicable to the investment in HVDC project (% / 100);
L is the life expectancy of the HVDC project (years).
Cost of lo
...
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