Pilot Distance Protection Scheme for DC Zonal Shipboard Microgrid
Asmaa M. Aboelezz, Bishoy E. Sedhom, Magdi M. El‐Saadawi
Abstract
The zonal DC Voltage shipboard microgrid has many issues in terms of the protection side. A novel adaptive pilot, DC distance protection scheme, is proposed in this paper for DC zonal shipboard microgrid to make the system more reliable, selective, and rapidly detect the fault. The proposed scheme is based on three stages. Firstly, it detects whether there is a fault in the system by applying the Fourier transform (FT) method to analyze the voltage and current measurements. Secondly, the fault location is detected by determining which line has the fault and selecting the proper zone for each relay. Thirdly, communication signals are sent between the two pilot relays for accurate fault localization before sending the tripping signals to the associated circuit breakers (CB) and isolating the fault. The 0.3 kV DC zonal shipboard microgrid is simulated in MATLAB/Simulink environment. The results prove that the proposed scheme is accurate and efficient in detecting and localizing the fault by providing backup protection depending on the different zones of distance relay.