101,998 research outputs found
Sistema di conversione c.a./c.c. a basso assprbimento armonico con isolamento dalla rete mediante trasformatore ad alta frequenza
No full textDC networks including multi-port DC/DC converters: Fault analysis
No full textDC networks that include storage systems, renewable sources, dc loads, and front-end converters can provide some advantages as compared with ac grids. However, the interruption of fault currents is difficult due to no-zero crossing of the current. Moreover, the fault clearing time of traditional dc circuit breakers can be too long for protecting power electronics switching components. Multiport converters seem to be a good solution for solving the aforementioned problem. The introduction of a multiport dc/dc converter, along with its configuration and a centralized control for power flow management, is proposed in the initial sections of this study. After this, this paper focuses on the study of system behavior during fault functioning conditions. Both pole-to-pole and pole-to-ground faults are investigated. The authors propose some control strategies and hardware solutions to overcome dc protection issues during several fault types. Some numerical simulation results are provided
Immissione in rete di energia elettrica prodotta da fonti rinnovabili, tramite inverters controllati in corrente
No full textNew prospects of a high frequency supply system for discharge lamps with centralized AC/DC conversion
No full textProposal of a Local dc Distribution Network with Distributed Energy Resources
No full textThe spread of the electronics, both for control and power applications, in the realization of apparatuses in Low Voltage (LV) electrical systems, requires the conversion of the electric power from alternating current to direct current by means of a rectifier stage, generally constituted by a diode bridge. Moreover, modern technologies provide various types of Distributed Energy Resources (DER), constituted by small size generators and storage systems, that generate in direct current, such as photovoltaic arrays, fuel cells, storage, or that need dc section before the interfacing with the ac network (microturbines, variable speed wind generators, flywheels).
It can be thought to integrate the various generators, storage systems and dc loads in a local dc distribution network, that is interfaced with public grid by means of one or more inverters. This solution makes easy the islanding operation of the generators.
The aim of this work is to analyze a local dc distribution system both with diode and IGBT bridge interface converter in the presence of small scale generation and storage systems. After a suitable modeling of the entire system, some simulation results will be given
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