Analysis and Detection of Pole-to-Pole Short-Circuit Fault Characteristics of LVDC Distribution Network

A LVDC distribution network pole-to-pole short-circuit fault model is established within this paper, with the aim to derive the pole-to-pole short-circuit fault characteristics of the LVDC distribution network through theoretical means. Detailed analysis reveals that the inter-pole short circuit fault can be partitioned into three distinct stages, each of which is meticulously elucidated while providing the corresponding response equations for voltage and current at every stage subsequent to the occurrence of the fault. At the same time, the impact of this fault on the AC current is analyzed. On the basis of the above, the characteristics of the fault current differential initial value are determined, a fault location method using current differential initial value characteristics is proposed, and a detailed fault location process is given. Finally, the MTLAB/Simulink simulation model was established. After simulation verification, it was confirmed that this method can accurately identify the fault location.