High-voltage direct-current project starting loop system and operation method

The invention aims to provide a high-voltage direct-current project starting loop system and an operation method. The system comprises a starting loop; the starting loop is located on the side of a converter transformer network. The starting loop comprises a starting resistor and an isolating switch; the starting resistor is used for limiting the current of the high-voltage direct-current power transmission system; the isolating switch is used for controlling the starting resistor to access the high-voltage direct-current power transmission system and exit from the high-voltage direct-current power transmission system; the starting resistor and the isolating switch are connected in parallel, one end of the starting resistor and one end of the isolating switch are connected to the same wire inlet end, and the other end of the starting resistor and the other end of the isolating switch are connected to the same wire outlet end. The problem that the sub-module capacitors are impacted in the starting process of t