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Keywords

input-series output-parallel converter, dual active bridge, voltage drop, adaptive voltage sharing, low voltage ride-through

Abstract

Input-series-output-parallel (ISOP) DC converters are widely used in DC grid scenarios for energy interconnection. The key challenge lies in addressing the input voltage imbalance among system modules. To address this issue, a hybrid modular ISOP DC converter with adaptive voltage balancing capability is proposed, combining resonant-type dual active bridge (SR-DAB) converters and phase-shifting dual active bridge (PS-DAB) converters. This system combines the high efficiency of SR-DAB and the flexible control capabilities of PS-DAB. By adding a passive LC resonant branch at the midpoint of the lagging arm of DAB, this resonant branch and the two half-bridge modules of adjacent sub-modules together form a non-isolated dual active half-bridge, thereby achieving adaptive voltage balancing for the system input. Additionally, a low voltage ride-through (LVRT) method is presented, which involves connecting a voltage adjustment module to the front end of DAB. The secondary side of the high-frequency transformer inside VAM is connected in series with an inductor, providing fault ride-through capability during voltage dips on the input and output sides of the system, thereby improving the transient controllability of the system. Finally, a model is built and validated in the MATLAB/SIMULINK environment, demonstrating the effectiveness of the adaptive voltage balancing performance and fault ride-through method.

DOI

10.19781/j.issn.1673-9140.2024.02.027

First Page

240

Last Page

248

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