基于遗传算法及信号谱分析的电网故障定位方法

Grid Fault Location Method Based on Genetic Algorithm and Signal Spectrum Analysis

为提高行波故障定位系统的可靠性并降低应用成本,提出了基于非故障线路透射波的区域故障定位方法。透射波在线路及母线上传播过程中的信号衰减、波形畸变及频率差异是影响区域故障定位精度的主要因素。由于透射波信号源相同,根据各透射波推导的初始故障时刻应相等。文中利用该条件建立了目标方程,通过对波速的优化解决上述因素导致的测距误差。在方程求解中,为便于变量取值,引入了频率及路径修正系数,并基于遗传算法完成目标方程的求解。最后,通过现场实际数据验证了算法的精度及可靠性。

In order to improve the reliability of transmission wave fault location system and reduce the application cost,a new method of fault location in the regional grid based on transmissive waves of healthy lines is proposed.The precision of fault location is mainly affected by the signal attenuation,wave distortion,and frequency deviation of transmissive wave propagating in the lines and buses.Since the signal sources of transmissive waves are the same,the initial failure moment derived from different transmissive waves should be the same.Based on this assumption,the target equation is developed,and the distancemeasuring error caused by the above factors is solved by optimizing the wave speed.In solving of the equation,the frequency and path revision coefficients are introduced as variables,and the target equation is solved with the genetic algorithm.Finally,the accuracy and reliability of the proposed algorithm is verified by in-field data.