First-Fault Detection in DC Distribution With IT Grounding Based on Sliding Discrete Fourier-Transform

Since dc distribution minimizes the number of power conversion stages, it lowers overall cost, losses, and weight a system. Critical systems use IT grounding because is tolerant to first-fault. Hence, this an attractive option for hybrid electric aircraft (HEA), which combines gas engines with motors driven by electronic converters. This letter proposes accurate implementation procedure first-fault detection grounding. The ac component injection along sliding discrete Fourier transform (SDFT) used estimate fault impedance. very due heavy filtering implicit moving average filter. Further computation savings are obtained using double look-up tables, Goertzel algorithm SDFT. Results validated simulations experiments.