1 Scope and Introduction
2 Explanation of Terms
2.1 DC Harmonics
2.2 Ideal Converter
2.3 Harmonic Order
2.4 Characteristic/Non-Characteristic Harmonies
2.5 Triplen Harmonics
2.6 Equivalent Disturbing Current (leg)
2.7 Harmonic Performance
2.8 DC Harmonic Filtering System
2.9 Induced Noise/Interference
2.10 Inductive Coordination
2.11 Ground Resistivity
2.12 System Unbalances
2.13 Bipolar Mode of Operation
2.14 Monopolar Mode of Operation
2.15 Sequence Components
2.16 Cmessage Weighting
2.17 Circuit Noise (Noise-Metallic)
2.18 Longitudinal Noise
2.19 Noise-To-Ground
2.20 Power Influence (P.I)
2.21 Longitudinal Balance
3 References
4 Methodology
4.1 Pre-Specification Studies
4.2 Power System Studies
4.3 Communication and Coordinating Studies
4.4 Commissioning Studies
4.5 In-service
5 DC Harmonies
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 (Hn)
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