基于MATLAB的10kV配电网单相断线故障分析模型构建及仿真验证分析

MATLAB-based Modeling and Simulative Analysis of Single-phase Line-breaking Fault Encountered by 10 kV Distribution Network

10 kV配电网发生单相断线故障时,故障电流较小、衰减速度较慢。为减少对用户的影响,采用MATLAB仿真软件构建10 kV配电网单相断线故障分析模型,以单相断线发生在A相为例进行了仿真分析。通过设置不同断线位置和过渡电阻,对中性点谐振接地系统和不接地系统单相断线故障的中性点电压、断口上下游的电压特征进行仿真验证。

Single-phase line-breaking faults in 10 kV distribution networks feature relatively small fault current and sluggish attenuation.To reduce the impact on users,MATLAB simulation software is used to model single-phase line-breaking faults in 10 kV distribution networks,and the simulative analysis is conducted with respect to an exemplary case of phase A occurrence of single-phase line-breaking.Through setting different line-breaking positions and transition resistance,characteristics of neutral point voltage and fracture upstream and downstream voltage are analyzed with respect to both neutral point resonant grounded system and isolated neutral system.