Abstract

Fault diagnosis is increasingly becoming more challenging in distribution network due to complicated network topology and coupling disturbances introduced into the systems. This requires a higher level of rapidity and accuracy of fault diagnosis, location and recovery. This paper proposes an earth fault location algorithm for distribution network using current analysis. The fault information can be obtained by those measuring equipment that have already installed in critical nodes and generations. Then, the mechanism model is proposed to illustrate the equilibrium relationship of current flow in distribution network with renewable energy sources. The criterions named current sag and current mismatch are also proposed in this paper for fast fault area location and accurate fault node location. Assessment of this method is carried out using a distribution network model with renewable energy sources in PSCAD. The experimental results confirm the effectiveness and superiority of the proposed method in distribution network fault diagnosis over conventional methods.

摘要

由于复杂的网络拓扑结构和引入系统的耦合干扰，故障诊断在配电网络中变得越来越具有挑战性。这需要更高水平的故障诊断、定位和恢复的快速性和准确性。本文提出了一种基于电流分析的配电网接地故障定位算法。故障信息可以通过已经安装在关键节点和世代的测量设备获得。然后，提出了机理模型来说明配电网电流与可再生能源的平衡关系。为了快速定位故障区域和准确定位故障节点，本文还提出了电流暂降和电流失配的判据。该方法的评估是使用 PSCAD 中可再生能源的配电网络模型进行的。实验结果证实了所提出的方法在配电网故障诊断中相对于传统方法的有效性和优越性。