DC Pole to Pole Short Circuit Fault Analysis in VSC-HVDC Transmission System

Voltage Source Converter High Voltage Direct Current (VSC-HVDC) transmission technology is widely used in electrical power transmission over very long distances. Those systems are subjected to different types of faults that have an effect on the electricity deliver continuity and reduce the device reliability. DC line faults are public in HVDC systems, it may occur in either overhead transmission lines or in submarine cables and with different configurations. In such faults, the converter stations must be blocked to isolate the transmission line and to shield the electronic switches. Therefore, fault detection, isolation and system restoring techniques are very important to development the system reliability. In this paper, DC pole to pole short circuit fault has been carefully studied. The fault behavior has been discussed from the fault moment until the fault clearance. A Matlab-Simulink model has been built to verify the mathematical analysis.