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TB 242 2004 SC B4 WG B4.35 Thyristor controlled voltage regulators: Parts 1 and 2

A two part report containing three non-conventional methods of voltage regulation by reactive power control : voltage controlled static var compensator, shunt capacitor bank series shorting and special delta star switching. The second part explores the feasibility of static onload transformer tap changers.

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TABLE OF CONTENTS

1 INTRODUCTION

2 STATIC REACTIVE POWER REGULATION

       2.1 Voltage Controlled Static VAR Compesator (VCSVC)

            2.1.1 Basic Circuit

            2.1.2 Equipment Ratings

            2.1.3 Comparison with Conventional SVCs

            2.1.4 Simulation Results

       2.2.Shut Capacitor Bank Series Shorting (CAPS)

            2.2.1 Background

            2.2.2 Summary

       2.3 Delta-star switching

            2.3.1 Background

            2.3.2 Detailed Description of the Method

       2.4 Protection

            2.4.1 Introduction

            2.4.2 Protection Zones

            2.4.3 Protection of subsystems of Thyristor Controlled Voltage Regulators

       2.5 Conclusion

 

3 TRASNFORMER TAP CHANGERS

      3.1 Introduction

      3.2 Thyristor Subtitution of Mechanical Contacts

            3.2.1 Commutation Problem

            3.2.2 Losses

            3.2.3 Fault Current Rating

            3.2.4 Tap Changer Location

            3.2.5 Number of Thyristors

      3.3 Hybrid Thyristor-type OLTC

            3.3.1 Basic Concept

            3.3.2 Hybrid Thyristor-type Diverter Switch without Transition Resistor:

            3.3.3 Hybrid Thyristor-type Diverter Switch with Transition Resistor

            3.3.4 Comparation of Hybrid Diverter Switch and without Transition Resistor

            3.3.5 Comparison of the hybrid thyristor-type OLTC with conventional OLTCs

            3.3.6 Conclusions

      3.4 Hybrid GTO-type OLTC

      3.5.Static OLTC with Thyristor Switched Windings

      3.6. Conclusion

 

4 REFERENCE