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输电线路参数因电压等级、运行环境、输电距离等特殊原因经常变动,传统的时域算法将会产生较大误差;另外,双端的不同步数据亦会严重影响时域算法的精度.为了克服传统的故障测距方法带来的误差,通过对国内外典型测距算法的对比分析,提出一种基于参数估计的利用双端非同步数据的故障测距算法.该算法不需要线路参数,利用故障后两端的电压、电流值,通过信赖域法估计未知参数,从而精确测得故障距离.通过两个实例验证了该算法的有效性和可靠性.“,”The traditional time-domain algorithms may cause many errors if the line parameters often change because of voltage level, environmental factors, transmission distance and so on.Furthermore, the unsynchronized two-ter-minal data will also affect the accuracy of time-domain algorithms.In order to overcome the errors caused by the tra-ditional methods, this paper presents a new unsynchronized two-terminal transmission-line fault location algorithm without requiring line parameters after analyzing the fault location algorithms at home and abroad.The voltage and current measurement at both ends of a transmission line during a fault are assumed to be available and the unknowns can be obtained by utilizing the trust-region algorithm and the result of fault-location can also be obtained.Evalua-tion studies using field data show that the proposed algorithm is effective and reliable.