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

Abstract

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, reactive power control, single-phase grounding fault arc extinguishing and the like, utilization efficiency of the power electronic equipment is greatly improved, capacity expansion is easy, and dispersion localization of grounding fault arc extinguishing and reactive power compensation can be realized.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to an integrated flexible arc suppression method for single-phase grounding faults in a distribution network. Background technique [0002] With the development of urbanization, a large number of active loads and reactive loads are connected, and the distribution network continues to extend, making the structure of the distribution network increasingly complex. The probability of faults in the distribution network is greatly increased, and single-phase ground faults account for more than 70% of the total faults in the distribution network. Single-phase grounding faults can easily be transformed into arcing ground faults, resulting in overvoltage and short-circuit between phases. At this time, fast and reliable arc suppression can effectively avoid fault expansion and ensure the safety of personnel and equipment. As more and more power electronic equipment is connected to the d...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide an integrated flexible arc suppression method for single-phase ground faults in distribution networks, which solves the problems of single function, high cost and inconvenient expansion of arc suppression capacity in existing active arc suppression devices. question

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