基于主导谐波频率的超高压输电线路单端故障测距算法

EHV Power Transmission Line Single-Ended Fault Location Algorithms Based on Dominant Harmonic Frequency

对于不对称故障,利用对称分量法详细推导并得出了主导谐波频率所在相别。基于运算法的推导结果给出了主导谐波频率与故障点位置的关系表达式,并由此提出了完整的故障测距算法。对于主导谐波频率的提取,采用经过后向线性预测与QR分解技术改进之后的Prony算法,使算法具有较高的可靠性与计算效率。ATP-EMTP仿真分析结果表明,故障测距算法在不同故障位置、不同故障类型、不同过渡电阻等故障条件下都具有较好的准确度。

For asymmetric faults, the phase where dominant harmonic frequency exists is derived in detail by symmetrical component method. The relation expression of the dominant harmonic frequency and the fault location is obtained based on the derivation of the computation method, with which the complete fault location algorithm is proposed. The Prony algorithm which has already been improved by the backward linear prediction and QR decomposition technique is used for the extraction of the dominant harmonic frequency to ensure that the algorithm is of higher reliability and computational efficiency. The simulation results show that the fault location algorithm in this paper is capable of providing correct responses under conditions of different fauh locations, fault types, and path resistances.