IEC TR 62001-2:2016

High-voltage direct current (HVDC) systems - Guidance to the specification and design evaluation of AC filters - Part 2: Performance

IEC TR 62001-2:2016(E), which is a Technical Report, provides guidance on the performance aspects and verification of performance of harmonic filters. The scope of this document covers AC side filtering for the frequency range of interest in terms of harmonic distortion and audible frequency disturbances. It excludes filters designed to be effective in the PLC and radio interference spectra. This document concerns the "conventional" AC filter technology and line-commutated high-voltage direct current (HVDC) converters. This first edition of IEC TR 62001-2, together with IEC TR 62001-1, IEC TR 62001-3 and IEC TR 62001-4, cancels and replaces IEC TR 62001 published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC TR 62001: a) expanded and supplemented Clause 19, and Annex B; b) new Clause 3 on current-based interference criteria; c) new annexes on induced noise calculation with Dubanton equations; d) addition of a TIF requirement in a technical specification; e) specification of IT limits dependent on network impedance and on the impact of AC network harmonic impedance; and f) specification of voltage level on the filter design necessary to fulfil an IT criterion.

General Information

• Status: Published
• Publication Date: 20-Jul-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• Technical Committee: SC 22F - Power electronics for electrical transmission and distribution systems
• Drafting Committee: MT 21 - TC 22/SC 22F/MT 21
• Current Stage: PPUB - Publication issued
• Start Date: 15-Oct-2016
• Completion Date: 21-Jul-2016

Relations

• Replaces: IEC TR 62001:2009 - High-voltage direct current (HVDC) systems - Guidebook to the specification and design evaluation of A.C. filters
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TR 62001-2 ®
Edition 1.0 2016-07
TECHNICAL
REPORT
colour
inside
High-voltage direct current (HVDC) systems – Guidance to the specification and
design evaluation of AC filters –
Part 2: Performance
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IEC TR 62001-2 ®
Edition 1.0 2016-07
TECHNICAL
REPORT
colour
inside
High-voltage direct current (HVDC) systems – Guidance to the specification and

design evaluation of AC filters –

Part 2: Performance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200 ISBN 978-2-8322-3540-9

– 2 – IEC TR 62001-2:2016 © IEC 2016
CONTENTS
FOREWORD .5
INTRODUCTION .7
1 Scope .8
2 Normative references .8
3 Current-based interference criteria .8
3.1 General .8
3.2 Determining the necessity for telephone interference limits .9
3.3 Defining telephone interference limits . 11
3.3.1 General . 11
3.3.2 Mechanisms of interference . 11
3.3.3 Noise performance coordination levels . 13
3.3.4 Influence of power transmission lines . 14
3.3.5 Determination of IT limits for a specific project . 19
3.3.6 Pre-existing harmonics and future growth . 23
3.3.7 Recommendations for technical specifications . 25
3.4 Consequences for filter design . 26
3.5 Telephone infrastructure mitigation options . 27
3.6 Experience and examples . 28
3.6.1 General . 28
3.6.2 Review of design requirements . 28
3.6.3 Measured current levels of schemes in service . 30
3.6.4 Example of actual telephone interference problems . 31
3.6.5 Experience in China, showing no interference problems . 33
3.7 Conclusions . 33
4 Field measurements and verification . 34
4.1 Overview . 34
4.2 Equipment and subsystem tests . 34
4.2.1 General . 34
4.2.2 Fundamental frequency impedance and unbalance measurement . 34
4.2.3 Frequency response curve . 34
4.3 System tests . 35
4.4 Measuring equipment . 35
4.4.1 Overview . 35
4.4.2 AC filter energization . 36
4.4.3 Verification of the reactive power controller . 36
4.4.4 Verification of the specified reactive power interchange . 36
4.4.5 Verification of the harmonic performance . 37
4.4.6 Verification of audible noise . 39
4.5 In-service measurements . 41
4.5.1 General . 41
4.5.2 In-service tuning checks . 41
4.5.3 On-line monitoring of tuning . 41
4.5.4 Monitoring of IT performance . 41
4.5.5 Measurements of pre-existing harmonic levels for design purposes . 41
Annex A (informative) Voltage and current distortion – Telephone interference . 42
A.1 Voltage distortion limits for HV and EHV networks . 42

A.1.1 General . 42
A.1.2 Recommended limits for HV or EHV networks . 43
A.2 Harmonic current in generators . 45
A.3 Causes of telephone interference . 45
A.4 Definition of telephone interference parameters . 47
A.5 Discussion . 50
A.6 Coupling mechanism from power-line current to telephone disturbance
voltage . 51
Annex B (informative) Example of induced noise calculation with Dubanton equations . 52
B.1 General . 52
B.2 Residual IT . 52
B.3 Balanced IT . 53
Annex C (informative) Illustration of the benefit of including a TIF requirement in the
technical specification. 54
Annex D (informative) Specification of IT limits dependent on network impedance . 56
Annex E (informative) The impact of AC network harmonic impedance and voltage
level on the filter design necessary to fulfil an IT criterion . 60
E.1 General . 60
E.2 Assumptions and pre-conditions . 61
E.3 Harmonic impedance of AC network . 63
E.4 Filter design . 65
E.5 Explanation of the difference in impact of relative and absolute performance
criteria on required filter Mvar . 67
Bibliography . 68

Figure 1 – Conversion factor from positive sequence current at the sending end to
positive sequence current at the receiving end, and input impedance of a 230 kV line,
124 km long, 1000 Ω-m . 21
Figure 2 – Conversion factor from positive sequence current to residual current, and
input impedance of a 230 kV line, 124 km long, 1 000 Ω-m . 21
Figure 3 – Simple circuit for calculation of harmonic performance taking into account
pre-existing harmonics . 23
Figure 4 – Converter variables for harmonic performance tests . 37
Figure 5 – Example of measurements made during a ramp of the converters . 40
Figure A.1 – Contributions of harmonic voltages at different voltage levels in a simple
network . 42
Figure A.2 – C-message and psophometric weighting factors . 46
Figure A.3 – Flow-chart describing the basic telephone interference mechanism . 51
Figure D.1 – Simplification of the detailed network used for telephone interference
simulation . 56
Figure D.2 – Induced voltage in telephone circuit vs. network impedance, for unitary

current injected . 57
Figure D.3 – IT limits as defined for different network impedances . 58
Figure E.1 – Converter harmonics un-weighted (A) and IT weighted (kA) on 240 kV
base . 62
Figure E.2 – Converter Mvar absorption versus load . 63
Figure E.3 – Impedance sector diagram and RL-equivalent circuit . 64
Figure E.4 – Simplified converter/system topology . 64
Figure E.5 – Simplified circuit including overhead transmission line . 65

– 4 – IEC TR 62001-2:2016 © IEC 2016

Table 1 – Performance thresholds for metallic noise . 14
Table 2 – Performance thresholds for longitudinal noise . 14
Table 3 – Performance thresholds for balance . 14
Table 4 – Illustrative maximum telephone line length to achieve the North American
recommended longitudinal N level, as a function of balanced IT level, earth
g
resistivity and
...