IEC TR 62001-1:2016

IEC TR 62001-1 ®
Edition 1.0 2016-05
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 1.0 2016-05
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 978-2-8322-3401-3

– 2 – IEC TR 62001-1:2016 © IEC 2016
CONTENTS
FOREWORD .8
INTRODUCTION . 10
1 Scope . 11
2 Terms and definitions . 11
3 Outline of specifications of AC filters for HVDC systems . 12
3.1 General . 12
3.2 Boundaries of responsibility . 13
3.3 Scope of studies . 14
3.4 Scope of supply . 15
3.5 Technical data to be supplied by contractor . 16
3.6 Alternative proposals by bidders . 16
4 Permissible distortion limits . 17
4.1 General . 17
4.2 Voltage distortion . 18
4.2.1 General . 18
4.2.2 Voltage distortion – Definitions of performance criteria . 18
4.2.3 Voltage distortion – Discussion and recommendations . 18
4.2.4 Voltage distortion – Determination of limits . 19
4.2.5 Voltage distortion – Pre-existing harmonic levels . 22
4.2.6 Voltage distortion – Relaxed limits for short term and infrequent
conditions . 23
4.2.7 Treatment of interharmonic frequencies . 23
4.3 Distortion limits pertaining to the HV and EHV network equipment . 24
4.3.1 HVAC transmission system equipment . 24
4.3.2 Harmonic currents in synchronous machines . 24
4.3.3 Nearby HVDC installations . 25
4.4 Telephone interference . 25
4.4.1 General . 25
4.4.2 Causes of telephone interference . 25
4.4.3 Telephone interference – Definitions of performance criteria. 25
4.4.4 Telephone interference – Discussion . 25
4.4.5 Telephone interference – Determination of limits . 26
4.4.6 Telephone interference – Pre-existing harmonic levels . 28
4.4.7 Telephone interference – Limits for temporary conditions . 28
4.5 Special criteria . 29
5 Harmonic generation . 29
5.1 General . 29
5.2 Converter harmonic generation . 29
5.2.1 Idealized conditions . 29
5.2.2 Realistic conditions . 31
5.3 Calculation methodology . 33
5.3.1 General . 33
5.3.2 Harmonic currents for performance, rating and other calculations . 33
5.3.3 Combining harmonics from different converter bridges . 34
5.3.4 Consistent sets . 34
5.3.5 Harmonic generation for different DC power ranges. 35

5.4 Sensitivity of harmonic generation to various factors . 36
5.4.1 Direct current, control angle and commutation overlap. 36
5.4.2 Effect of asymmetries on characteristic harmonics . 37
5.4.3 Converter equipment parameter tolerances . 37
5.4.4 Tap steps . 37
5.4.5 Theoretically cancelled harmonics . 37
5.4.6 Negative and zero phase sequence voltages . 38
5.4.7 Converter transformer saturation . 38
5.4.8 Harmonic interaction across the converter . 39
5.4.9 Back-to-back systems . 39
5.5 Externally generated harmonics . 39
6 Filter arrangements . 40
6.1 Overview . 40
6.2 Advantages and disadvantages of typical filters . 41
6.3 Classification of filter types . 41
6.4 Tuned filters . 42
6.4.1 Single tuned filters . 42
6.4.2 Double tuned filters . 43
6.4.3 Triple tuned filters . 45
6.5 Damped filters . 46
6.5.1 Single tuned damped filters . 46
6.5.2 Double tuned damped filters. 49
6.6 Choice of filters . 49
7 Filter performance calculation . 50
7.1 Calculation procedure . 50
7.1.1 General . 50
7.1.2 Input data . 51
7.1.3 Methodology . 51
7.1.4 Calculation of converter harmonic currents . 52
7.1.5 Selection of filter types and calculation of their impedances . 52
7.1.6 Calculation of performance . 53
7.2 Detuning and tolerances . 54
7.2.1 General . 54
7.2.2 Detuning factors . 54
7.2.3 Resistance variations . 55
7.2.4 Modelling . 55
7.3 Network impedance for performance calculations . 56
7.3.1 General . 56
7.3.2 Network modelling using impedance envelopes . 57
7.3.3 Sector diagram . 58
7.3.4 Circle diagram . 59
7.3.5 Discrete polygons . 59
7.3.6 Zero-sequence impedance modelling . 61
7.3.7 Detailed modelling of AC network for performance calculation . 61
7.4 Outages of filter banks and sub-banks . 62
7.5 Considerations of probability . 63
7.6 Flexibility regarding compliance . 65
7.7 Ratings of the harmonic filter equipment . 65
8 Filter switching and reactive power management . 65

– 4 – IEC TR 62001-1:2016 © IEC 2016
8.1 General . 65
8.2 Reactive power interchange with AC network . 66
8.2.1 General .
...