Grounding method and system of power distribution network through voltage arc suppression coil

The invention discloses a grounding method and system for a power distribution network through a voltage arc suppression coil, and the method comprises the steps: the power distribution network is grounded through the voltage arc suppression coil, the voltage arc suppression coil at least comprises an iron core with an air gap and two winding coils wound on the iron core, one end of a first winding is grounded through a damping resistor or is directly grounded, and the other end of the first winding is grounded through a second winding. The other end is connected to a neutral point or a phase line of the power distribution network or a tapping tap of a grounding transformer; the second winding applies a voltage. Under the normal operation condition of the power distribution network, the voltage arc suppression coil tracks the ground capacitance change of the power distribution network to realize automatic tuning; under the grounding fault condition of the power distribution network, the second winding injects