配电网下基于PMU量测的混合故障测距法

Research of hybrid fault location method based on PMU for distribution networks

精确的故障定位是节省巡线人力和物力的关键,对于提高供电可靠性,减小持续停电造成的损失具有重要意义。针对目前输电网故障测距技术比较成熟,而配电网精确故障测距尚待深入研究的实际情况,提出了配电网故障测距策略,其包括两个步骤:首先基于故障指示器(FI)实现故障区段或故障分支定位,然后利用所提的混合故障测距法,实现带分支辐射型配电网的精确故障测距。最后通过MATLAB仿真验证了所提故障测距策略的有效性,实验结果表现出了较高的故障测距精度。

Accurate fault location is the key to save the manpower and material resources, which has important significance for improving the reliability of power supply and reducing the loss of continuous power supply. Aiming at the current fault location technologies of transmission networks are relatively mature, and the exact fault location of distri- bution networks are still to be further studied, the fault location strategy for distribution network was proposed, which consisted of two steps ： the fault section or fault branch was realized based on fault indicator （FI）. Secondly, the ac- curate fault location of the radial distribution network with the branch was realized by using the hybrid fault location method. Finally, the effectiveness of the proposed fault location method was verified by MATLAB simulation. The ex- perimental results show the high accuracy of fault location.