Voltage sourced converter based high voltage direct current (VSC-HVDC) with ±800 kV/5 000 MW ultra-high voltage and large-capacity level is an important development direction of HVDC technology. Considering the development status of VSC-HVDC technology, the advantages and disadvantages of converter configurations with symmetrical monopole wiring and symmetrical bipolar wiring are compared. For the ±800 kV/5 000 MW VSC-HVDC technology, the device characteristics and operation performance of single converter scheme and double converter scheme under symmetrical bipolar wiring are compared and analyzed. The analysis results show that the double converter scheme is more suitable for the ultra-high voltage, large capacity and long distance VSC-HVDC technology because of its more flexible operation modes and higher energy availability.