低压有源配电网在线故障区间定位与识别方法

发布时间：2018-02-20 07:48

本文关键词： 主动配电网故障定位故障类型识别分布式电源　出处：《中国电机工程学报》2017年09期 　论文类型：期刊论文

【摘要】：配电网的故障定位与故障类型识别对配电网故障的全面综合诊断有着重要的作用,有利于故障的小范围隔离与快速检修。分布式电源在配电网低压侧的分散式接入将现有低压配电网变为低压有源配电网,其故障特性的改变给继电保护的协调配合带来了极大的挑战,并导致原有的配电网故障定位与故障类型识别方法不再适用,需要对低压有源配电网内的故障定位与识别方法进行研究。该文提出了一种适用于低压有源配电网的在线故障区间定位与识别方法,该方法仅需电流测量,首先将低压有源配电网划分为多个双端无分支区段,利用各个区段的电流相角差值进行快速的故障区段判定与故障选相;在故障区段内,利用故障相与节点零序电流对故障的具体类型进行快速识别;最后,综合各个区段的故障判别结果可得系统内的故障位置与对应的故障类型。经仿真验证,所提出的方法正确、有效,能够适用于三相平衡或不平衡、并网或孤岛运行、树状或环状结构的低压有源配电网。
[Abstract]:Fault location and fault type identification of distribution network plays an important role in comprehensive diagnosis of distribution network faults. Distributed power supply decentralized access to the low-voltage side of the distribution network will transform the existing low-voltage distribution network into a low-voltage active distribution network. The change of fault characteristics brings a great challenge to the coordination of relay protection, and leads to the original fault location and fault type identification method is no longer applicable. It is necessary to study the method of fault location and identification in low-voltage active distribution network. In this paper, an on-line fault interval location and identification method for low-voltage active distribution network is proposed, which requires only current measurement. First of all, the low voltage active distribution network is divided into several two-terminal unbranched sections, and the fault section is determined and the fault phase is selected quickly by using the current phase angle difference of each section. Fault phase and node zero sequence current are used to quickly identify the specific types of faults. Finally, the fault location and the corresponding fault types in the system can be obtained by synthesizing the fault discrimination results of each section. The simulation results show that the proposed method is correct. It can be applied to low voltage active distribution network with three-phase balance or unbalance, grid-connected or isolated island operation, tree-shaped or annular structure.
【作者单位】：中国科学院电工研究所;中国科学院大学;
【基金】：中国科学院知识创新工程重要方向项目(KGCX2-EW-329)~~
【分类号】：TM711

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