prEN IEC 61803:2025
(Main)Determination of power losses in high-voltage direct current (HVDC) converter stations
Determination of power losses in high-voltage direct current (HVDC) converter stations
Détermination des pertes en puissance dans les postes de conversion en courant continu à haute tension (CCHT)
Ugotavljanje močnostnih izgub v visokonapetostnih enosmernih (HVDC) pretvorniških postajah
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Ugotavljanje močnostnih izgub v visokonapetostnih enosmernih (HVDC)
pretvorniških postajah
Determination of power losses in high-voltage direct current (HVDC) converter stations
Détermination des pertes en puissance dans les postes de conversion en courant
continu à haute tension (CCHT)
Ta slovenski standard je istoveten z: prEN IEC 61803:2025
ICS:
29.200 Usmerniki. Pretvorniki. Rectifiers. Convertors.
Stabilizirano električno Stabilized power supply
napajanje
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
22F/821/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61803 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-06-06 2025-08-29
SUPERSEDES DOCUMENTS:
22F/778/CD, 22F/800A/CC
IEC SC 22F : POWER ELECTRONICS FOR ELECTRICAL TRANSMISSION AND DISTRIBUTION SYSTEMS
SECRETARIAT: SECRETARY:
IEC Secretariat Ms Suzanne Yap
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 115
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
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This document is still under study and subject to change. It should not be used for reference purposes.
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clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Determination of power losses in high-voltage direct current (HVDC) converter stations
PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
This CDV is prepared based on 22F/778/CD and the agreed NC comments in 22F/800A/CC by SC 22F/MT 14
(Convenor: Mr. Sanjay Mukoo).
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
IEC CDV 61803 © IEC 2025 – 2 – 22F/821/CDV
1 CONTENTS
2 CONTENTS . 2
3 FOREWORD . 4
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms, definitions and symbols . 7
7 3.1 Terms and definitions . 7
8 3.2 Symbols . 8
9 3.2.1 Common . 8
10 3.2.2 Line-Commutated Converters. 8
11 4 Overview . 9
12 4.1 General . 9
13 4.2 Ambient conditions . 10
14 4.2.1 General . 10
15 4.2.2 Outdoor standard reference temperature . 10
16 4.2.3 Coolant standard reference temperature . 10
17 4.2.4 Standard reference air pressure . 10
18 4.3 Operating parameters . 10
19 5 Determination of equipment losses . 11
20 5.1 Thyristor valve losses (LCC only) . 11
21 5.1.1 General . 11
22 5.1.2 Thyristor conduction loss per valve . 11
23 5.1.3 Thyristor spreading loss per valve . 12
24 5.1.4 Other conduction losses per valve . 13
25 5.1.5 DC voltage-dependent loss per valve . 13
26 5.1.6 Damping loss per valve (resistor-dependent term) . 14
27 5.1.7 Damping loss per valve (change of capacitor energy term) . 14
28 5.1.8 Turn-off losses per valve . 15
29 5.1.9 Reactor loss per valve . 16
30 5.1.10 Total valve losses . 16
31 5.1.11 Temperature effects . 16
32 5.1.12 No-load operation loss per valve . 17
33 5.2 transformer losses . 17
34 5.2.1 General . 17
35 5.2.2 No-load operation losses . 17
36 5.2.3 Operating losses . 18
37 5.2.4 Auxiliary power losses . 19
38 5.3 AC filter losses . 19
39 5.3.1 General . 19
40 5.3.2 AC filter capacitor losses . 20
41 5.3.3 AC filter reactor losses . 20
42 5.3.4 AC filter resistor losses . 21
43 5.3.5 Total AC filter losses . 21
44 5.4 Shunt capacitor bank losses . 21
45 5.5 Shunt reactor losses . 21
46 5.6 DC smoothing reactor losses. 21
47 5.7 DC filter losses. 23
IEC CDV 61803 © IEC 2025 – 3 – 22F/821/CDV
48 5.7.1 General . 23
49 5.7.2 DC filter capacitor losses . 23
50 5.7.3 DC filter reactor losses . 23
51 5.7.4 DC filter resistor losses . 24
52 5.7.5 Total DC filter losses . 24
53 5.8 Auxiliaries and station service losses . 24
54 5.9 Series filter losses . 25
55 5.10 Phase reactor losses (VSC only) . 26
56 5.11 Valve reactor losses (VSC only) . 26
57 5.12 Other equipment losses . 27
58 Annex A (informative) Calculation of harmonic currents and voltages (LCC only) . 35
59 A.1 Harmonic currents in converter transformers . 35
60 A.2 Harmonic currents in the AC filters . 35
61 A.3 Harmonic voltages on the DC side . 36
62 A.4 DC side harmonic currents in the smoothing reactor. 36
63 Annex B (informative) Typical station losses . 37
64 Annex C (informative) HVDC converter station loss evaluation – An illustration . 38
65 C.1 General . 38
66 C.2 Loss evaluation under various cases . 39
67 Bibliography . 41
69 Figure 1 – Typical high-voltage direct current (HVDC) equipment for one pole of a HVDC
70 scheme .30
71 Figure 2 – Simplified three-phase diagram of an HVDC 12-pulse converter (LCC) .31
72 Figure 3 – Simplified equivalent circuit of a typical thyristor valve .31
73 Figure 4 – Current and voltage waveforms of a valve operating in a 12-pulse converter .32
74 Figure 5 – Thyristor on-state characteristic .33
75 Figure 6 – Conduction current and voltage drop of thyristor .33
76 Figure 7 – Distribution of commutating inductance between L and L .34
1 2
77 Figure 8 – Thyristor current during reverse recovery .34
79 Table B.1 – Typical values of losses for a LCC Station.37
80 Table B.2 – Typical values of losses for a VSC MMC Station .37
81 Table C.1 – Conditions for calculation of losses in case D1 .40
82 Table C.2 – Conditions for calculation of losses in case D2 .40
IEC CDV 61803 © IEC 2025 – 4 – 22F/821/CDV
85 INTERNATIONAL ELECTROTECHNICAL COMMISSION
86 ____________
88 DETERMINATION OF POWER LOSSES IN HIGH-VOLTAGE
89 DIRECT CURRENT (HVDC) CONVERTER STATIONS
92 FOREWORD
93 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
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