A fault location approach for high-impedance grounded DC shipboard power distribution systems

DC microgrids and distribution systems: An overview

“…However, in integrated power systems (IPS), these two energy systems are combined seeking an increased reliability during normal sailing and battle conditions. One of the options that are likely to be commonly used in IPS is the DC zonal distribution system [153][154][155], which assures several advantages other than the increased reliability, such as the facilitation of protection since the sources and loads are distributed into different zones each with its own converters. Medium voltage DC distribution is another architecture that is also extensively investigated to be implemented on future shipboard power systems [156,157].…”

Feasibility study of noise pattern analysis based ground fault locating method for ungrounded DC shipboard power distribution systems

“…Current techniques are often time consuming, cumbersome, and expensive. Previously, the authors presented a novel approach which utilizes the inherent noise from switching converters to find the fault location [1]. The noise is caused by repetitive switching transients introduced by power electronic converters interacting with parasitic elements such as cable capacitance and inductance.…”

“…In [1], a high fidelity EMTDC model of the DC shipboard power distribution system was built as shown in Figure 1. To capture the realistic behavior of the system at different frequencies, the frequency dependent (phase) cable model in EMTDC was used and the four DC-DC converters were purposely controlled separately.…”

“…To capture the realistic behavior of the system at different frequencies, the frequency dependent (phase) cable model in EMTDC was used and the four DC-DC converters were purposely controlled separately. Since the study in [1] only explores the effectiveness of the method principally, no input filtering at the input of the converters is considered. The midpoint voltage of rectifier 1 was chosen to be the suitable system signal which was measured and analyzed to find the fault location.…”

“…The midpoint voltage of rectifier 1 was chosen to be the suitable system signal which was measured and analyzed to find the fault location. The results in [1] showed that significant noise patterns could be extracted by adequate signal processing methods to allow fault location from a single signal measurement. This paper explores one of the key technical issues surrounding utilization of high frequency noise signals.…”