基于Prony算法的小电流接地系统单相接地故障选线研究

Prony算法是用一组指数函数的线性组合来拟合等间隔采样数据的方法,可以从中分析出信号的幅值、相位、衰减系数、频率等信息。通过对故障零序电流特征的分析,提出采用Prony算法来提取故障零序电流的谐波分量的信息,比较谐波分量的幅值和相位来实现正确选线。理论分析及仿真实验表明该方法可以准确实现小电流接地系统单相接地故障选线。

Fault line detection for single-phase-to-earth faults in the neutral indirectly grounded system based on Prony method

Prony algorithm is a method in which a set of linear combination of exponential components were used to fit the uniformlyspaced sampling data. With the algorithm, the amplitude, phase, damping, and frequency of the signal can be analyzed. Through the analysis of the characteristics of zero sequence currents in fault circumstances, Prony algorithm could be adopted to abstract the information about the harmonic component of fault zero sequence current, then the fault line could be detected by comparing the amplitude and phase of that. Theoretical analysis and simulation results show that the proposed method can detect the fault line reliably and exactly.