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TB 352 2008 WG B4.34 Capacitor Commutated Converted (CCC) HVDC Interconnections: Digital modeling and Benchmark Circuit

Capacitor Commutated Converter -CCC- calls for developing models for digital studies. The TB discusses the state of the art in digital studies of HVDC connections with CCC converters and proposes a benchmark circuit. It will serve as a simplified guide for application/specification of this type converter stations.

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TABLE OF CONTENTS

INTRODUCTION

2 SCOPE

      2.1 Main topics

      2.2 Studies performed by WG B4-34 and included in this report

3 GENERAL CHARACTERISTICS OF CONVERTER INSTALLATIONS WITH COMMUTATION

   CAPACITORS

      3.1 Definition and basic characteristics of CCC converters.

      3.2 General control characteristics

      3.3 Criterion for reactive power exchange at converters AC buses

      3.4 Modeling Characteristics of Converters with Commutation Capacitors, for Steady-State and for

           Electromechanical Stability

      3.5 Steady-State Performance

      3.6 Dynamic performance

            3.6.1 Tests on the CCC Control Systems

4 THE PROPOSAL OF A BENCHMARK

      4.1 Premises for obtaining the benchmark model

      4.2 Systems connected to the AC buses of Converter Stations

            4.2.1 Equivalent AC Networks

            4.2.2 Simplified AC Networks

            4.2.3 Short-circuit Ratios

      4.3 Modeling in the Programs PSCAD/EMTDC and ATP

5 CONCLUSIONS