基于线路参数估计的高压架空输电线路故障测距新算法

在现有的故障测距算法中,输电线路参数都是作为已知恒量参与运算,其准确性是影响测距精度的一个重要因素.文中提出一种基于线路参数估计的故障测距最小二乘算法,该算法无需已知准确的线路阻抗参数,无需增加硬件装置,利用现场双端故障录波装置提供的数据,在线估计出线路参数,同时计算出故障距离,从原理上克服了现场实际因素造成的线路参数不准确或变化对测距结果精度的影响.理论分析及仿真结果表明,该算法具有很高的测距精度.

A FAULT LOCATION ALGORITHM FOR HIGH VOLTAGE OVERHEAD POWER TRANSMISSION LINE BASED ON LINE PARAMETER ESTIMATION

In existing fault location algorithms the parameters of power transmission line are regarded as known constants, so the accuracy of fault location depends on that of the value of parameters. Here, a least-squares algorithm for fault location based on parameter estimation of transmission line is proposed in which the accurate value of the line parameters is not to be known and no hardware should be added. Using the data provided by the fault recorders equipped at the both ends of the transmission line, the on-line parameter estimation of the transmission line can be carried out and the position where fault occurs can be determined, therefore the influence of inaccuracy or variation of the line parameter value, which is caused by the practical factors on site, on the accuracy of fault location can be overcome. The results from theoretical analysis and simulation show that high accuracy of fault location can be obtained by use of the proposed algorithm.