基于虚拟阻抗的复杂配电网故障区段定位新方法

针对含分布式电源的复杂配电网故障区段定位的问题，提出一种基于虚拟阻抗的故障定位新方法。首先以区段为单元识别畸变节点的故障信息，采用尝试赋值法校正畸变节点的故障信息；然后利用区段端节点过流信息初步判定故障位置，将故障区段端节点间的虚拟导纳值用0表示，非故障区段端节点间虚拟导纳用1表示，进而形成能反映节点间连通性的节点虚拟阻抗矩阵，根据故障电流的流通路径最终确定故障区段位置。具体算例验证表明，该方法具有故障定位准确、效率高的特点，可以满足复杂配电网的多点信息畸变校正和多重故障的故障区段定位。

A New Approach of Fault Section Location in Complicated Distribution Network Based on Virtual Impedance

For the fault section location in the complex distribution network with distributed generation, a new method based on virtual impedance is put forward in this paper. First, the fault information of distorted nodes is identified with section as a unit, and the fault information of distorted nodes is corrected by attempt assignment method. Second, the fault location is preliminarily determined by using the over-current information of the section end nodes. The virtual impedance between end-nodes of fault sections is represented by 0 and of non-fault sections by 1, thus the nodal virtual impedance matrix is formed to reflect the connectivity of each node. Finally, the fault section location is determined by flow path of the fault current. Examples show that the proposed method has the characteristics of accurate fault location and high efficiency, and can meet the needs of multi-point information distortion correction and the multi-fault location of the complex distribution network.