It is very important to locate the short-circuit fault in a power system quickly and accurately. Electromagnetic time reversal (EMTR) has drawn increasing attention because of its clear physical background and excellent performance. This paper studies the EMTR method for locating the short-circuit fault of transmission and distribution lines with or without branches, and introduces a simulated annealing algorithm to accelerate the calculation of an EMTR fault location. This algorithm is different from the traditional exhaustive method in that it solves the corresponding optimization problem, thus improving the location speed by up to an order of magnitude. With the help of graph theory, a method is proposed that automatically splits a complex line topology with branches into several one-dimensional lines. The problem of short-circuit fault location in the branching lines is then transformed into several one-dimensional optimization problems, which are then solved by the optimization algorithm. This solves the problem of realizing rapid location in a power network with branches. Numerical experiments are carried out in a distribution network model to demonstrate the effectiveness of the method. Results under different conditions show the method works reliably and efficiently.
翻译:快速和准确地定位电源系统中的短路断层非常重要。 电磁时间逆转( EMTR) 因其清晰的物理背景和出色的性能而引起越来越多的关注。 本文研究用于定位有分支或没有分支的传输和分配线的短路断层的EMTR方法, 并引入模拟防爆算法以加速计算EMTR断层的位置。 此算法不同于传统的详尽无遗方法, 因为它解决了相应的优化问题, 从而将定位速度提高到一个数量级。 在图形理论的帮助下, 提出了一种方法, 将复杂的线条表层和分支自动分割为几条一维线。 分线的短路断层位置问题随后转化为几个一维优化问题, 然后通过优化算法加以解决。 这解决了在配有分支的电力网络中实现快速定位的问题。 数字实验是在分布网模型中进行, 以显示方法的有效性。 不同条件下的结果显示方法的可靠性和效率。