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This paper proposes a unidirectional DC/DC converter termed LCT DC/DC, which has a high stepping ratio and is suitable for integrating renewable energy sources. The LCT DC/DC converter consists of four power modules, and each of them is composed of a voltage source converter (VSC), an inductor−capacitor circuit, an AC transformer, and a diode rectifier bridge. By means of the two‐stage voltage boost,...
This paper studies a step-up unidirectional DC-DC autotransformer (UUDAT) topology that is dedicated for HVDC application. The UUDAT is composed by series connection of VSC and diode bridges. Because of employing DC-DC autotransformer technology, UUDAT is able to significantly reduce the power ratings of VSC, diode bridges and AC link compared with conventional unidirectional DC-AC-DC technology....
In order to increase the operating flexibility and reliability of HVDC lines for power transmission, this paper studies the technical feasibility of interconnecting two Chinese LCC HVDC using a high power DC/DC converter. A new control system is proposed for each rectifier, inverter and DC/DC converter to enable independent operation of each terminal. DC voltage droop feedback is designed to moderate...
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