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TB 082 1994 SC 38 WG 38.01.05 Use of DC converters for VAR control.

This brochure is intended as an application guide for system planners and operators as well as equipment engineers who want to evaluate control strategies for DC converters. It starts with an explanation of DC converter capabilities and how this can be evaluated for var control.

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TABLE OF CONTENTS

1 INTRODUCTION

2 DC CONVERTER CAPABILITIES

      2.1 Introduction

      2.2 Steady state DC converter capabilities

      2.3 Converter transformer tap control

      2.4 Temporary DC converter capabilities

3 THE DC CONVERTER USED FOR VOLTAGE CONTROL

      3.1 Introduction

      3.2 Steady state control characteristics

      3.3 Concept of DC converter control

      3.4 Dynamic control

      3.5 Other considerations in using DC converters for voltage control

4 RECOVERY FROM DISTURBANCES, HANDLING OF RESONANCES AND LOAD REJECTIONS

      4.1 Impact of DC fau1ts

      4.2 Impact of AC faults

      4.3 Recovery from faults

      4.4 Operation under low AC voltage conditions

      4.5 Temporary overvoltages

            4.5.1 Fundamental-frequency overvoltages

            4.5.2 Transient overvoltages

            4.5.3 Low-order harmonic resonances

5 MODELS FOR LOAD FLOW CALCULATIONS, TRANSIENT STABILITY CALCULATIONS AND

     LOCALVOLTAGE CONTROL

6 CONSIDERATIONS ON USING DC CONVERTERS FOR VOLTAGE CONTROL COMPARED WITH

    OTHER SOURCES

      6.1 The DC converter used for the daily voltage control

      6.2 The DC converter used for continuous voltage control

      6.3 The DC converter used for reactive power reserve

      6.4 Other considerations

      6.5 Comparison between DC converter for voltage control and DC converter with SVC

7 CONCLUSIONS