基于暂态电流故障分量的直流配电网单极故障选线方法

高淑萍; 段必聪; 宋国兵; 邵明星

doi:10.19912/j.0254-0096.tynxb.2020-0682

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太阳能学报 ›› 2022, Vol. 43 ›› Issue (3) : 141-146. DOI: 10.19912/j.0254-0096.tynxb.2020-0682

基于暂态电流故障分量的直流配电网单极故障选线方法

高淑萍¹, 段必聪¹, 宋国兵², 邵明星¹

作者信息 +

SINGLE-POLE FAULT LINE SELECTION METHOD OF DC DISTRIBUTION NETWORK BASED ON TRANSIENT CURRENT FAULT COMPONENT

Gao Shuping¹, Duan Bicong¹, Song Guobing², Shao Mingxing¹

Author information +

文章历史 +

摘要

基于两电平电压源换流器（voltage sourced converter,VSC）的中压柔性直流配电网适合风能、太阳能等分布式能源的接入,但发生单极接地故障时,其故障电流会迅速增大,保护装置必须快速识别出发生故障的线路。针对该问题,分析VSC端的单极接地故障时的暂态特征,对暂态故障电流的变化特征进行理论分析计算。根据各条线路的暂态故障电流信息的差值进行故障选线,所提方法可在3 ms内对故障快速可靠识别。最后,在PSCAD/EMTDC中搭建适合辐射状中压柔性直流配电网模型,利用Matlab进行保护选线算法的验证,仿真结果表明,所提选线方法能够准确识别柔性直流配电网的单极接地故障的线路。

Abstract

The medium voltage flexible DC distribution network based on two-level converter （VSC） is suitable for the access of distributed energy such as wind energy and solar energy. However, when the unipolar grounding fault occurs, the fault current will rise rapidly, and the protection device must quickly identify the fault line. To solve this problem, this paper analyzes the transient characteristics of single-pole grounding fault in VSC terminal, and theoretically analyzes and calculates the variation characteristics of transient fault current. The fault line selection is carried out according to the difference of transient fault current information of each line. The proposed method can quickly and reliably identify the fault within 3 ms. Finally, the model of radial medium voltage flexible DC distribution network is built in PSCAD/EMTDC, and the protection line selection algorithm is verified by Matlab. The simulation results show that the proposed line selection method can accurately identify the single-pole grounding fault line of flexible DC distribution network.

导出引用

高淑萍, 段必聪, 宋国兵, 邵明星. 基于暂态电流故障分量的直流配电网单极故障选线方法[J]. 太阳能学报. 2022, 43(3): 141-146 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0682

Gao Shuping, Duan Bicong, Song Guobing, Shao Mingxing. SINGLE-POLE FAULT LINE SELECTION METHOD OF DC DISTRIBUTION NETWORK BASED ON TRANSIENT CURRENT FAULT COMPONENT[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 141-146 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0682

中图分类号： TM77

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