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IEC TR 62001-1
Edition 2.0 2021-07
TECHNICAL
REPORT
colour
inside
High-voltage direct current (HVDC) systems – Guidance to the specification and
design evaluation of AC filters –
Part 1: Overview
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IEC TR 62001-1
Edition 2.0 2021-07
TECHNICAL
REPORT
colour
inside
High-voltage direct current (HVDC) systems – Guidance to the specification and
design evaluation of AC filters –
Part 1: Overview
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200 ISBN 978-2-8322-9986-9
– 2 – IEC TR 62001-1:2021 IEC 2021
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 10
4 Outline of specifications of AC filters for HVDC systems . 11
4.1 General . 11
4.2 Boundaries of responsibility . 12
4.3 Scope of studies . 14
4.4 Scope of supply . 14
4.5 Technical data to be supplied by contractor . 15
4.6 Alternative proposals by bidders . 15
5 Permissible distortion limits . 16
5.1 General . 16
5.2 Voltage distortion . 17
5.2.1 General . 17
5.2.2 Definitions of performance criteria . 17
5.2.3 Discussion and recommendations . 18
5.2.4 Determination of limits . 18
5.2.5 Pre-existing harmonic levels . 21
5.2.6 Relaxed limits for short term and infrequent conditions . 22
5.2.7 Treatment of interharmonic frequencies . 22
5.3 Distortion limits pertaining to the HV and EHV network equipment . 23
5.3.1 HVAC transmission system equipment . 23
5.3.2 Harmonic currents in synchronous machines . 23
5.3.3 Nearby HVDC installations . 24
5.4 Telephone interference . 24
5.4.1 General . 24
5.4.2 Causes of telephone interference . 24
5.4.3 Definitions of performance criteria . 24
5.4.4 Discussion . 25
5.4.5 Determination of limits . 25
5.4.6 Pre-existing harmonic levels . 27
5.4.7 Limits for temporary conditions . 27
5.5 Special criteria . 28
6 Harmonic generation . 28
6.1 General . 28
6.2 Converter harmonic generation . 28
6.2.1 Idealized conditions . 28
6.2.2 Realistic conditions . 30
6.3 Calculation methodology . 32
6.3.1 General . 32
6.3.2 Harmonic currents for performance, rating and other calculations . 32
6.3.3 Combining harmonics from different converter bridges. 33
6.3.4 Consistent sets . 33
6.3.5 Harmonic generation for different DC power ranges . 34
6.4 Sensitivity of harmonic generation to various factors . 35
6.4.1 Direct current, control angle and commutation overlap . 35
6.4.2 Effect of asymmetries on characteristic harmonics . 35
6.4.3 Converter equipment parameter tolerances . 35
6.4.4 Tap steps . 36
6.4.5 Theoretically cancelled harmonics . 36
6.4.6 Negative and zero sequence voltages . 36
6.4.7 Converter transformer saturation . 37
6.4.8 Harmonic interaction across the converter . 37
6.4.9 Back-to-back systems . 38
6.5 Externally generated harmonics . 38
7 Filter arrangements . 38
7.1 Overview . 38
7.2 Advantages and disadvantages of typical filters . 39
7.3 Classification of filter types . 40
7.4 Tuned filters . 40
7.4.1 Single tuned filters . 40
7.4.2 Double tuned filters . 42
7.4.3 Triple tuned filters . 44
7.5 Damped filters . 45
7.5.1 Single tuned damped filters . 45
7.5.2 Double tuned damped filters . 48
7.6 Choice of filters . 49
8 Filter performance calculation . 50
8.1 Calculation procedure . 50
8.1.1 General . 50
8.1.2 Input data . 50
8.1.3 Methodology . 50
8.1.4 Calculation of converter harmonic currents . 51
8.1.5 Selection of filter types and calculation of their impedances . 52
8.1.6 Calculation of performance . 52
8.2 Detuning and tolerances . 53
8.2.1 General . 53
8.2.2 Detuning factors . 54
8.2.3 Resistance variations . 55
8.2.4 Modelling . 55
8.3 Network impedance for performance calculations . 55
8.3.1 General . 55
8.3.2 Network modelling using impedance envelopes . 56
8.3.3 Sector diagram . 57
8.3.4 Circle diagram . 58
8.3.5 Discrete polygons . 59
8.3.6 Zero-sequence impedance modelling . 61
8.3.7 Detailed modelling of AC network for performance calculation . 61
8.4 Outages of filter banks and sub-banks . 62
8.5 Considerations of probability . 63
8.6 Flexibility regarding compliance . 65
8.7 Ratings of the harmonic filter equipment . 65
9 Filter switching and reactive power management . 66
– 4 – IEC TR 62001-1:2021 IEC 2021
9.1 General . 66
9.2 Reactive power interchange with AC network . 66
9.2.1 General .
...