故障录波分析中衰减直流分量参数的估计算法

摘要

The initial amplitude and time constant of decaying DC component was related with fault analysis, but the existing fault recording analysis software couldn't give the accurate DC component parameter. Based on the least square method and the Prony algorithm, two algorithms for estimating DC component parameters were proposed;the implementation process and matters needing attention were detailed. In the light of the characteristic of fault recording electrical signal, the methods to improve the parameter estimation accuracy and evaluate the parameter estimation were introduced. The feasibility and validity of the proposed algorithmswere verified by the results on the mathematical analytical signal, Matlab/Simulink simulation signal, and the actual fault signal.%衰减直流分量的幅值和时间常数是与故障分析相关的重要参数，但现有故障录波分析软件给出的直流分量参数不够准确。提出基于最小二乘法和基于Prony算法的两种衰减直流分量参数估计算法，给出了算法实现方法及注意事项，并针对故障录波电气信号特点，提出了提高参数估计精度的措施，给出算法的评估指标。对数学解析信号、Matlab/Simulink仿真信号和实际故障录波信号的分析结果，验证了算法的可行性和有效性。算法已应用于故障录波分析软件设计。