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TB 364 2008 WG B4.41 Systems with multiple DC Infeed

The TB provides an analytical framework for the understanding of interactions amongst multiple HVDC line commutated inverter stations within a common ac system. The theoretical development is complemented by actual system examples of multi-infeed HVDC planning.

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TABLE OF CONTENTS

EXECUTIVE SUMMARY

PREFACE

INDEX OF AUTHORS

ACRONYMS

1 - INTRODUCTION OF MULTIINFEED CONCEPTS

      1.1. Introduction

      1.2. A Historical Perspective

      1.3. The Test System

            1.3.1. SCR and ESCR Calculations

            1.3.2. Multi Infeed Interaction Factor (MIIF)

            1.3.3. Multiinfeed Interactive ESCR Definition (MIESCR)

            1.3.4. A Comparison of Single and Multiinfeed Situations

      1.4. Benefits of the Methodology

      1.5. Phenomena of Interest

            1.5.1. Planning Procedure

            1.5.2. HVdc Penetration in a Large AC System

      1.6. References

2 - INTERACTION PHENOMENA

      2.1. Introduction

      2.2. Transient Overvoltage

            2.2.1. Transient Overvoltages (TOV) in a Multiinfeed Context

            2.2.2. Worst Case TOV vs MIESCR for an Inverter on the CIGRÉ Multiinfeed HVdc Test System

            2.2.3. Study Tools and Methodology

            2.2.4. Study Methods for Systems with Very High TOV Levels.

            2.2.5. Cable Systems

      2.3. Commutation Failure Performance and AC Fault Recovery

            2.3.1. Introduction

            2.3.2. Study Tools & Methodology

            2.3.3. Commutation Failure Immunity Assessment

            2.3.4. Commutation Failure Immunity Index (CFII)

            2.3.5. Mitigation Strategies

            2.3.6. Cable Systems

      2.4. Harmonic Performance

            2.4.1. Introduction

            2.4.2. Harmonic Interactions in Multiinfeed HVdc Systems

            2.4.3. Basics of Filter Design

            2.4.4. Study Tools & Methodology

            2.4.5. Low Order Resonances

            2.4.6. Mitigation Strategies

            2.4.7. Conclusions

            2.4.8. Cable Systems

      2.5. Control Interactions and Power/Voltage Instability

            2.5.1. Control Interactions and PV Instability in a Multiinfeed Context

            2.5.2. Study Tools and Methodology

            2.5.3. Study Methods

            2.5.4. Mitigation Strategies

            2.5.5. Cable Systems

      2.6. Operating Systems

      2.7. References

3 - SYSTEM APPLICATIONS

      3.1. Canada

            3.1.1. MIIF

            3.1.2. MIESCR at the Inverters.

            3.1.3. Transient Over Voltage Considerations

            3.1.4. Commutation Failure and Fault Recovery

            3.1.5. Harmonics

            3.1.6. Control Interactions and Power/Voltage Instability

            3.1.7. Conclusions

      3.2. Norway

            3.2.1. MIIF and MIESCR at the inverters

            3.2.2. Transient Over Voltage Considerations

            3.2.3. Commutation Failure and Fault Recovery

            3.2.4. Harmonics

            3.2.5. Mitigation Strategies

      3.3. China

            3.3.1. General

            3.3.2. Configuration 1 with Four HVdc Links

            3.3.3. Configuration 2 with Five HVdc Links

      3.4. Denmark

            3.4.1. MIIF and ESCR

            3.4.2. MIESCR for the Eastern and Western Systems

            3.4.3. MIIF Approximation using Short-Circuit Calculation

      3.5. References

MULTIINFEED HVdc BIBLIOGRAPHY