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TB 223 2003 SC B4 WG B4.28 Active filters in HVDC applications

This report presents both DC and AC active filters including the existing installations. The items of the report are nearly arranged in two consecutive parts, the first treating the DC application, while the second covers the AC filters. As active DC and AC filters share many concepts subjects may be dealt with in both parts.

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TABLE OF CONTENTS

1 ACTIVE DC FILTERS IN HVDC APPLICATIONS

      1.1 INTRODUCING ACTIVE DC FILTERS

      1.2 TECHNICAL DEMANDS TO DISTURBANCES ON THE DC SIDE

      1.3 DESCRIPTION OF ACTIVE DC FILTERS

            1.3.1 Semiconductors available for a power stage

            1.3.2 Types of converters available

            1.3.3 Connections of the active DC filter

            1.3.4 Characteristics of installed active DC filters

      1.4 MAIN COMPONENTS IN AN ACTIVE DC FILTER

            1.4.1 The passive part

            1.4.2 The current transducer

            1.4.3 The control system

            1.4.4 The amplifier

            1.4.5 The transformer

            1.4.6 Protection circuit and arrester

            1.4.7 Bypass switch and disconnectors

      1.5 ACTIVE DC FILTER CONTROL

            1.5.1 Active DC filter control methods

      1.6 PROJECT DESCRIPTIONS AND DC FILTER SOLUTIONS

            1.6.1 Skagerrak 3 HVDC Intertie

            1.6.2 Baltic Cable HVDC Link

            1.6.3 Chandrapur-Padghe HVDC power transmission project

            1.6.4 Tian - Guang long distance HVDC project

            1.6.5 EGAT-TNB (Thailand-Malaysia) HVDC Interconnection

      1.7 PERFORMANCE OF THE SKAGERRAK 3 HVDC INTERTIE ACTIVE DC FILTER

      1.8 CONCLUSIONS ON ACTIVE DC FILTERS

 2 ACTIVE AC FILTERS IN HVDC APPLICATIONS

      2.1 INTRODUCING ACTIVE AC FILTERS

      2.2 TECHNICAL DEMANDS TO HARMONIC DISTURBANCES ON THE AC SIDE

      2.3 PASSIVE FILTERS

            2.3.1 Conventional passive filters

            2.3.2 Continuously tuned passive filters

      2.4 REASONS FOR USING ACTIVE FILTERS IN HVDC SCHEMES

      2.5 OPERATION PRINCIPLES OF ACTIVE FILTERS

            2.5.1 Shunt connected active filter

            2.5.2 Series connected active filter

      2.6 PARALLEL AND SERIES CONFIGURATION

            2.6.1 Hybrid filter schemes

      2.7 CONVERTER CONFIGURATIONS

            2.7.1 Converters

            2.7.2 STATCOM

      2.8 ACTIVE AC FILTER CONFIGURATIONS

            2.8.1 Active ac filters for low voltage application

            2.8.2 Active ac filters for medium voltage application

            2.8.3 Active ac filters for HVDC applications

      2.9 SERIES CONNECTED ACTIVE FILTERS

      2.10 CONTROL SYSTEM

            2.10.1 Introduction

            2.10.2 Description of a generic active power filter controller

            2.10.3 Calculation of reference current

            2.10.4 Synchronous reference frame (SRF)

            2.10.5 Other control approaches

            2.10.6 HVDC AC active filter control approach

      2.11 EXISTING ACTIVE AC FILTER APPLICATIONS

            2.11.1 Low and medium voltage

            2.11.2 High voltage applications

      2.12 OVERVIEW ON FILTER SOLUTIONS FOR HVDC SYSTEMS

            2.12.1 Solution with conventional passive filters

            2.12.2 Solution with continuously tuned passive filters

            2.12.3 Solution with active filters

            2.12.4 Solution with continuously tuned passive filters and active filters

            2.12.5 Study cases with the Cigré HVDC model

      2.13 FUTURE TECHNOLOGIES

      2.14 CONCLUSIONS ON ACTIVE AC FILTERS

 3 LIST OF MEMBERS

 4 BIBLIOGRAPHY