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DC grid technology is regarded as a promising solution for future electric networks integrating a great amount of renewable energies. It calls for high-efficiency bidirectional dc-dc converters with a high step-up ratio to interconnect mediumvoltage dc (MVDC) distribution grids and high-voltage dc (HVDC) transmission grids. This paper focuses on dynamic performance and fault-tolerant capability of...
This paper presents a simple passive voltage balancing circuit for a modular DC/DC step-up converter for medium voltage (MV) DC grid in wind energy systems. The proposed auxiliary circuit is able to balance the capacitor voltages over a wide range of operating points. Regarding the converter, high frequency step-up resonant circuits with high gain rectifier modules are combined to form a modular step-up...
In this paper, a resonant switched-capacitor dc-dc converter is proposed for data center application. The proposed converter possesses features such as high efficiency, high power density and light-weight. Zero current switching (ZCS) can be achieved with the resonant operation, which allows the converter operating under high efficiency. Proper switching device selection and in-depth power loss analysis...
This paper proposes a novel input-series output-parallel (ISOP) current-fed modular dual-active-bridge (CF-MDAB) dc-dc converter for medium-voltage dc (MVDC) system application. The proposed converter exhibits favorite features of DAB converter such as galvanic isolation, soft-switching condition and small passive components. Compared to ISOP DAB converter, the proposed topology has direct dc current...
A reliable modular dc-dc converter that is well-suited to the MVDC grid applications is proposed in this paper. This converter benefits from zero current turn-off and soft turn-on switching; hence, it can use naturally commutated switches such as silicon-controlled rectifiers (SCR). SCRs offer numerous advantages over other types of switches, among them are simple control, long lifetime, low losses,...
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