Flexible Grounding Arc Suppression Method of Distribution Network Based on Discrete Domain Double Closed Loop Control

doi:10.16628/j.cnki.2095-8188.2021.12.013

Abstract

Abstract:

When a single-phase grounding fault occurs in a neutral point non-effectively grounded distribution network,the traditional arc suppression coil can only compensate for the reactive components of the grounding current,but not the active and harmonic components.In this paper,by analyzing the mechanism of active arc suppression for single-phase grounding faults,an active arc suppression method based on double closed-loop control in the discrete domain is proposed.The inner current loop provides virtual damping for the system,and the optimal gain design method of the current inner loop is proposed based on root locus analysis.The voltage outer loop adopts a resonant controller to realize the non-static adjustment of the AC voltage,and a delay compensation method is proposed to improve the stability of the system.The simulation results verify the effectiveness of the proposed discrete domain double closed-loop control strategy.When a single-phase grounding fault occurs in the distribution network,the ground current can be fully compensated to ensure the safe and reliable operation of distribution network.

Key words: active compensation, double closed-loop control, single-phase ground fault, arc suppression

CLC Number:

TM615

LU Yang, PAN Yifan, YANG Yajun, WU Jiaheng. Flexible Grounding Arc Suppression Method of Distribution Network Based on Discrete Domain Double Closed Loop Control[J]. LOW VOLTAGE APPARATUS, 2021, 0(12): 71-77.

Figures/Tables 16

References 21

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线路类型	相序	线路电阻/ (Ω·km^-1)	线路电感/ (mH·km^-1)	对地电容/ (μF·km^-1)
架空线路	正序	0.125 0	1.300 0	0.009 6
架空线路	零序	0.275 0	4.600 0	0.005 4
电缆线路	正序	0.270 0	0.255 0	0.339 0
电缆线路	零序	2.700 0	1.019 0	0.280 0

电流成分	有效值/A	电流成分	有效值/A
基波无功	72.14	9次谐流	0.27
基波有功	3.83	11次谐流	2.90
3次谐流	0.66	13次谐流	2.05
5次谐流	9.19	15次谐流	0.12
7次谐流	7.28	17次谐流	0.09