Multi-Sample Differential Protection Scheme in DC Microgrids

This article proposes a novel solution to the issue of protection instability caused by time synchronization error in high-speed differential schemes for dc microgrids. DC microgrids provide more efficient platform integrate fast-growing renewable energy sources, storage systems, and electronic loads. However, integration distributed generators (DGs) may result variable fault current magnitude direction during conditions, potentially causing miscoordination conventional graded overcurrent relays. One identified this utilizes maintain effective selectivity DG-dominated as short-circuit currents are highly transient, microseconds measured line cause stability issues, whereby maloperation relays occur faults external protected zone. investigates impact errors distribution systems. It then multisample (MSD) scheme that performs multiple comparisons over sampling window ensure while maintaining sensitivity internal faults.