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TB 114 1997 SC 13/14 WG 13/14.08 Circuit-breakers for meshed multiterminal HVDC system.

HVDC multiterminal (MTDC) Systems permit the exchange of energy between a number of HVDC substations. The particular advantage of the meshed system is that this exchange can continue even when one of the interconnecting lines is out of service. Investigations have shown that the performance of MTDC systems can be improved by installing HVDC circuit-breakers at appropriate locations.

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TABLE OF CONTENTS

1 INTRODUCTION

      1.1 HVDC multiterminal systems

      1.2 Basic tasks and locations of DCCBs

      1.3 Circuit-breaker configuration

      1.4 Circuit-breaker stresses

      1.5 Method and tools of investigation

            1.5.1 Representative system

            1.5.2 The parity simulator

            1.5.3The simulator set-up

            1.5.4 Digital simulation

      1.6 Converter control requirements

2 DC SIDE SUBSTATIONS SWITCHING UNDER NORMAL AND FAULT CONDITIONS

      2.1 General comments

      2.2 Possible scenarios

      2.3 Connecting a substation to the MTDC system

      2.4 Normal disconnection

      2.5 Disconnecting a substation without a fault (inadvertent trip)

      2.6 Disconnecting a substation for a DC bus fault

      2.7 Disconnection of the substation for fault between the smoothing reactor and the substation

            DCCB

      2.8 Disconnecting a substation for a fault between the converter and smoothing reactor

      2.9 Disconnecting a substation for persistent commutation failures

      2.10 Disconnecting a substation because islanding has occurred on the AC side

      2.11 Disconnecting a substation for a line fault (inadvertent trip)

3 SIMULATOR STUDIES

      3.1 Cases studied

      3.2 System data

      3.3 Results of the studies

            3.3.1 Case 2.7: Disconnection of the substation for a fault between the smoothing reactor and

                     the substation DCCB

            3.3.2 Case 2.8 Disconnection of the substation for a fault between the converter and the

                      smoothing reactor

4 SUMMARY OF REQUIREMENTS

5 OSCILLOGRAMS 1-10

6 APPENDIX 1

7 REFERENCES