Distributed fault location algorithm for hybrid lines based on the different characteristics of dual-mode traveling waves

Abstract Aiming at the problems that the inconsistent wave velocity of hybrid lines leads to the failure of traditional dual-terminal fault location methods, the low accuracy of traveling wave head acquisition, and the location results are susceptible to the interference of wave velocity uncertainty and clock asynchrony, this paper proposes a distributed fault location algorithm based on the different characteristics of dual-mode traveling waves. Firstly, three improved strategies are proposed for the shortcomings of the crown porcupine optimizer (CPO) algorithm. Then, the improved CPO algorithm is introduced to further optimize the parameters of the traditional variational mode decomposition, and the optimal decomposition of the traveling wave signal is realized, thereby improving the detection accuracy of the traveling wave head. Secondly, a new distributed fault location model is constructed. The fault section determination and distance calculation are carried out by using the mutual difference value of dual-mode traveling wave, which avoids the influence of wave velocity uncertainty and clock deviation on the ranging results and improves the ranging accuracy. Finally, in order to verify the effectiveness of the proposed algorithm, Matlab/Simulink is used to build a hybrid line simulation model of cable-overhead lines. The experimental results show that the average relative error rate of the algorithm is 0.029%. Compared with the traveling wave fault location of wave velocity normalization, energy attenuation model, MEEMD and TEO, VMD and TEO, it is improved by 0.3772%, 0.2132%, 0.2644% and 0.2526% respectively.