Adaptive Reclosing and Fault Recovery Strategies for Large Scale Distributed Generation Access in Distribution Networks

doi:10.16183/j.cnki.jsjtu.2024.073

Abstract

Abstract:

High penetration distributed generation (DG) in power grids has placed greater demands on power supply recovery in distribution network fault scenarios. Research on fault recovery in distribution networks is essential for improving the reliability and stability of distribution systems. In order to enhance the recovery capability of the distribution network, this paper proposes a fault recovery scheme which combines reclosing technology with the low-voltage ride through (LVRT) characteristics of distributed power sources. As an important method for quickly restoring power supply, adaptive reclosing, when coordinated with the LVRT capability of DG in the time domain, can effectively reduce the disconnection rate of DG from the grid. In fault scenarios, flexible soft switches play an important role in load transfer and voltage support, which not only ensures continuous power supply to users but also enhances the utilization efficiency of renewable energy sources and reduces their disconnection rate. This paper proposes different fault recovery schemes for both sides of the fault location in the distribution network, and finally proves the effectiveness and feasibility of the proposed fault recovery scheme by developing a simulation model on the MATLAB/Simulink simulation platform.

Key words: distributed generation (DG), distribution network fault recovery, low-voltage ride through (LVRT), soft open point (SOP)

CLC Number:

TM762.2

WANG Ruoqi, HU Yan, YANG Zengli, WANG Jing, WU Di, ZHANG Zhen. Adaptive Reclosing and Fault Recovery Strategies for Large Scale Distributed Generation Access in Distribution Networks[J]. Journal of Shanghai Jiao Tong University, 2026, 60(1): 42-50.

Figures/Tables 12

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VSC1	VSC2	系统运行方式
PQ控制	V_dcQ控制	正常运行
V_dcQ控制	PQ控制	正常运行
V/f控制	V_dc控制	VSC1侧发生故障
V_dcQ控制	V/f控制	VSC2侧发生故障

参数	取值	线路阻抗
线路AB长度/km	2	正序电阻R₁=0.175 Ω/km
线路BC长度/km	2	正序电感L₁=0.001 21 H/km
线路CD长度/km	6	正序电容C₁=0.383 2 μF/km
线路DE长度/km	2	零序电阻R₀=0.23 Ω/km
线路FG长度/km	2	零序电感阻L₀=0.005 47 H/km
		零序电容C₀=0.398 μF/km
系统电源电压/kV	10
负荷容量/MW	2
DG容量/MW	3

方案	停电持续时间/s	断电负荷/MW	DG脱网率/%
联切DG+使用联络开关的重合闸与故障恢复方案	>2	4	100
所提重合闸与故障恢复方案	0	0	28.57