MTDC transmission systems including dc resonant semiconductor breaker

This study proposes the dc resonant semiconductor breaker for multi-terminal high voltage direct current (MTDC) transmission systems. MTDC system is connected self-excited converter of four areas. This system can be performed the bidirectional transmission. The proposed breaker consists of following: charged capacitor, discharge switch, semiconductor breaker, resistor to the energy consumption. When fault is occurred, discharges switch turn on and capacitor discharges. Thus, a reverse current flow through the line of failure and the zero-cross point are generated. The semiconductor breaker is controlled the turned off and cut off fault current at this point. Thereafter, the energy of the dc line flow into bypass circuit having a resistor and it is dissipated. This system can continue the transmission after blocking completion. This study is verified by using the Matlab/Simulink.