Integrated flexible arc extinguishing method of single-phase grounding fault of power distribution network

The invention relates to an integrated flexible arc extinguishing method of a single-phase grounding fault of a power distribution network. Multiple functions of arc extinguishing of the single-phasegrounding fault of the power distribution network, active power and reactive power control of a load and the like are realized by using multi-level converter integration. Independent control of activepower, reactive power and zero-sequence power is achieved through current decoupling control under a rotating coordinate system. The control of the active power and the reactive power of the load isrealized by utilizing an instantaneous power theory, and the control of zero-sequence power is realized by a flexible arc extinguishing algorithm of the single-phase grounding fault. For problems thatan existing active arc extinguishing device is single in function; and cost performance is low due to high cost, in the invention, the same set of power electronic equipment has the multiple functions of active power control, r