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Distribution System Operators are working to improve and extend the level of control of their grid, as response to the new challenges of integrating distribution renewable sources and improving the quality of their service. In doing so, they need also to face up to the problem of reaching their transformer stations via a suitable communication technology, which can guarantee a balanced tradeoff between...
In the last years the interest towards Power Electronic Transformers (PET) is increasing. These new conversion apparatuses perform either voltage transformation or power quality functions, using power electronics both on primary and secondary sides of a transformer operating at medium frequency. In the technical literature are proposed several circuital configurations, with different control strategies...
A high-efficiency high-frequency link inverter design with bi-directional power flow, using a zero-voltage-switching (ZVS) technique is proposed. The considered configuration includes a HF full-bridge inverter, a HF transformer, a 3-phase cycloconverter; Required bidirectional switches have been composed by anti-series IGBT connection. Main advantages of the topology are weight and size reduction,...
Fuel Cell systems require power conditioning to interface them to loads or the utility grid. In single phase applications normal operation of the power conditioning converter introduces a significant second harmonic current ripple that reduces the power availability of the stack up to 20%. A similar effect can be observed in three phase applications operating under unbalanced loads. To mitigate this...
Nowadays, the typical railway traction chain, which operates under alternative power supplies, includes a heavy and bulky transformer. In order to reduce the size and the weight of the input transformer, a medium frequency topology, which involves switches in soft commutation mode, is proposed. A test bench, based on one elementary stage of the complete structure, was built. It allows characterizing...
The report describes the possibility of application the ultracapacitors in the widely used frequency-controlled electric drives. The energy efficiency estimation of using the ultracapacitors in the different purposes electric drives is described. The theoretical and experimental investigation results for electric drives with capacitive energy storage are shown.
In this paper is presented a comparison of two converter topologies based on single-phase link for offshore wind turbines with permanent magnet synchronous generator. The scheme of the converter module considered is based on four stages: an inductive filter, an 3AC-AC converter, a single-phase high-frequency transformer and a full-bridge diode rectifier. The conventional 3AC-AC converter with DC-Link...
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