Wavelet based fast fault detection in LVDC micro-grid

This Low Voltage DC (LVDC) distribution system is gaining momentum which includes Distributed energy resources and DC sensitive electronic loads. However, due to lack of standards and mature experience in DC protection, LVDC application is still an elusive issue. In order to ameliorate these deficiencies, a wavelet based fast fault protection scheme using local measurements has been proposed for eliminating threat to Voltage Source Converters during fault. The wavelet energy and change in energy are the key indicators to identify the fault with wide variations in operating conditions including the impact of grid-connected and islanded mode of operation. Further, the robustness of the proposed fast fault detection scheme has been validated for high impedance ground fault. The proposed scheme validation using Real Time Digital Simulation indicates that the proposed fault detector for LVDC micro-grid has potential ability in performing the desired task.