摘要：The article addresses the problem of short-circuits in DC circuits of high voltage direct current (HVDC) transmission systems.The current state of HVDC technology development,including achievable parameters of semiconductor components,relevant for short-circuit strength, are presented.The differences between voltage source converter (VSC HVDC) topologies are described from the perspective of affecting the possibilities of switching off short-circuit currents and the results of simulation tests for selected topologies are presented.Responses of a system with a cable and overhead line to ground-fault of one or both poles are analysed and compared.The results of the analysis have shown that short-circuits in the DC circuits of a VSC HVDC system cause a rapid and very significant increase in the short-circuit current,which imposes high requirements on DC breakers that are starting to appear in field applications.
关键词：direct current transmission system;HVDC;VSC;LCC;direct current;short-circuit;DC switch
