Table of Contents

1. Overview
    1.1 Scope
    1.2 Purpose
2. References
3. Explanation of terms
    3.1 DC harmonics
    3.2 Ideal converter
    3.3 Harmonic order
    3.4 Characteristic/noncharacteristic harmonics
    3.5 Triplen harmonics
    3.6 Equivalent disturbing current (I[eq])
    3.7 Harmonic performance
    3.8 DC harmonic filtering system
    3.9 Induced noise/interference
    3.10 Inductive coordination
    3.11 Ground resistivity
    3.12 System imbalances
    3.13 Bipolar mode of operation
    3.14 Monopolar mode of operation
    3.15 Sequence components
    3.16 C message weighting
    3.17 Circuit noise (noise-metallic)
    3.18 Longitudinal noise
    3.19 Noise-to-ground
    3.20 Power influence (PI)
    3.21 Longitudinal balance
4. General methodology
    4.1 Pre-specification studies
    4.2 Power system studies
    4.3 Communication and coordination studies
    4.4 Commissioning studies
    4.5 In-service studies
5. DC harmonics
    5.1 Introduction
    5.2 Behavior of an ideal converter
    5.3 Modeling of converter for dc harmonic analysis
    5.4 Calculation of harmonic driving voltages
    5.5 Calculation of harmonic currents
    5.6 Harmonic current flow
6. Induced noise analysis
    6.1 Basic theory
    6.2 Equivalent disturbing current
    6.3 Calculation of mutual impedance
    6.4 Calculation of frequency dependency (H[n])
    6.5 Application of the equivalent disturbing current
         method
7. Mitigation
    7.1 Introduction
    7.2 Mitigation methods
    7.3 Mitigation examples
8. DC filter performance specification
    8.1 Description of the dc system
    8.2 Basic data to be considered for harmonic calculation
    8.3 Methods for harmonic calculation
    8.4 Performance requirements
    8.5 Bid information
    8.6 DC-side harmonic field measurement
9. HVDC filter performance measurements
    9.1 Test probes
    9.2 Direct measurement of current
    9.3 Measurement of driving voltages
10. Review of specification and performance of dc filters for
    the recent HVDC projects
    10.1 Filter performance specification
    10.2 Performance values actually agreed
    10.3 Performance values actually measured with the system
         in operation
    10.4 Mitigation methods used to solve interference
         problems
Annex A (informative) Bibliography

Abstract

Contains information and recommendations pertaining to the analysis and specification of the performance on the dc side of a high-voltage direct-current converter station concerning the electrical noise at harmonic frequencies up to 5 kHz generated by converter stations in a dc transmission system. Also contains information and suggestions pertaining to measurement of dc filter performance and noise level induced in wireline communications circuits from harmonic currents on dc transmission lines.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN
Supersedes	IEEE DRAFT 1124 : D8 DEC 97