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TB 123 1997 SC 14 WG 14.18 Thyristor controlled series compensation

The application of power electronic thyristor valves in HVDC and SVC technologies has enabled the development of controllable series devices with rapid response for use in electric power transmission systems. With growing environmental, regulatory and financial constraints facing the electric utility industry, technical advancements and economic solutions which allow increased utilization and relaible operation of transmission systems have potential benefits for utilities and their customers.

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TABLE OF CONTENTS

INTRODUCTION

1 TYPES AND BASIC CHARACTERISTICS

      1.1 Thyristor Switched Series Capacitor

      1.2 Thyristor Controlled Series Capacitor

      1.3 Thyristor Switched Series Reactor

      1.4 Thyristor Controlled Series Reactor

2 APPLICATIONS TO ELECTRIC POWER SYSTEMS

      2.1 Power Transfer Capability Improvement

      2.2 Loop Flow Mitigation

      2.3 Stability Improvements

      2.4 System Damping Improvement

      2.5 Subsynchronous Resonance (SSR) Mitigation

      2.6 TCSC Modeling Aspects

      2.7 Economic Benefits

3 CONTROL IMPLEMENTATION

      3.1 TSSC Control

      3.2 TCSC Control

      3.3 Operating Modes

      3.4 TCSC Operation

      3.5 Platform Power

      3.6 Instrumentation

      3.7 Recorders

      3.8 Redundancy

      3.9 Cooling System

4 PROTECTION

      4.1 Protection Philosophy

      4.2 Protection Functions

      4.3 Coordination with Line Protection

      4.4 Coordination with Generator

5 DESIGN CONSIDERATIONS

      5.1 Current Rating

      5.2 Voltage Rating

      5.3 MVAR Rating

      5.4 Reactance Rating

      5.5 MOV

      5.6 Thyristor Valves

      5.7 Cooling Systems

      5.8 Capacitor Rating

      5.9 Number of Modules

      5.10 Bypass Breaker

      5.11 Environmental

6 STATION LAYOUT CONSIDERATIONS

      6.1 Platform Assembly

      6.2 Control Building

      6.3 Substation Equipment

      6.4 Safety

7 GUIDELINES FOR TESTING

      7.1 Factory and Off-Site Tests

      7.2 Site Test

      7.3 Documentation

      7.4 Training

8 RELIABILITY, AVAILABILITY AND MAINTAINABILITY

9 INSTALLATIONS AND APPLICATION STUDIES

      9.1 Kanawha River TSSC

      9.2 Kayenta TCSC

      9.3 Slatt TCSC

      9.4 Stöde TCSC

      9.5 Queensland and New South Wales TCSC (Australia)

      9.6 Prospective Application of TCSC to Improve. Transmission System Performance (Brazil)

      9.7 Inter-Area Mode Damping Application of TCSC

      9.8 TCSR

      9.9 Application Studies

10 FUTURE TRENDS

11 BIBLIOGRAPHY