MATLAB在小电流系统单相接地故障选线中的应用

Simulation Study on Fault-Line Selection of Non- Direct- Grounded System Based on MATLAB

简单地叙述了MATLAB软件的发展历史以及在电力系统仿真中的应用，用简练的语句介绍了在电力系统仿真中经常使用的Simulink中的元器件及其所属的元件库。在此基础上，本文以小电流系统为分析对象，分别对中性点不接地与中性点经消弧线圈接地两种不同的系统发生单相接地短路故障后的选线问题进行了分析，并介绍了两种选线方法——零序电流比幅法和突变量检测法。对于这两种选线方法，本文采用了先进行原理分析再加以仿真应用的方法，详细的予以了介绍。通过搭建10KV电压等级的系统平台，以MATLAB为主要的仿真工具，验证了两种选线方法的可行性与正确性。除此之外，MATLAB在电力系统仿真中的种种优势以及其强大的数值分析及图形处理功能也得到了好的体现。

Brief introduction on the development history and application in power system simulation of MATLAB is presented. Commonly- used components in the simulation of power system are also introduced. Based on the analysis of non-direct-ground system and fault-line selection of isolated neutral and neutral earthing via arc extinguishing coil system, two methods of fault-line selection zero-sequence current amplitude comparison and mutation detection are introduced detailedly by principle analysis and simulation application. MATLAB is used as main simulation tool to test feasibility and correctness of the two methods on the built 10 KV system platform. Furthermore, advantages and powerful numerical analysis and graphics processing capabilities of MATLAB in power system simulation has also been reflected very well.