Fault current characteristics of multi-terminal HVDC system

Owing to the type and structure of HVDC system, fault current characteristics can be varied. Until the present, most of studies have been dealt with fault current characteristic of HVDC system which focused on point-to-point connection. However, there were few announcements about the fault current characteristic of MTDC system. In this works, as a first step to determine the characteristics of circuit breaker for MTDC network, simulation works of fault current characteristics in MTDC system was investigated. Two types of MTDC system model were designed by Matlab/Simulink; Tree-like topology and Meshed topology. Pole to pole fault which is the severe fault in HVDC system was imposed and its characteristics was analyzed and compared. From the simulation result, the characteristics of fault current in MTDC system were analyzed and basic requirements for HVDC circuit breaker were suggested.