多电源环网中输电线路参数估计测距法(二)——菲波那契法及随机试验法电源参数选优

Fault Location of Transmission Line in Multi-Source Network with Meshes via Parameter Estimation (2) ——Optimum Seeking of Source Parameters by Fibonacii and Random Test Method

为推算故障线路对端电压电流的值，进行双侧数据测距，需要估计各电源的结构参数，本文用复数故障距离的虚部绝对值与本端及对端计算的复数故障点电压的实部之差的绝对值之和，作为目标函数，在测距计算的同时，用菲波那契法进行电源参数优化，可获得待估的电源电抗值，当待估的电源数较多时，用随机试验法亦可获得满足工程需要的测距结果。

In order to locate the fault distance with both end data of a faulted line, it is necessary to estimate the data at the remote end, which requires in turn a correct estimation of source constructional parameters. While calculating the fault distance and fault node voltage with the measured data and the estimated data, the imaginary part of the former and the difference of the real parts of the latter can be used as indications of the error of the estimated source parameters. Therefore it allows using the method of Fibonacii to seek the optimum source parameters in the process of fault locating calulation. In two dimensional optimun seeking, accurate (in the sense of simulatioon) results can be obtained. When the dimension becomes larger, results with accuracy satisfying engineering requirement be obtained.