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High-power density DAB-type DC transformer submodule topology and control method thereof

A DC transformer, high power density technology, applied in the direction of DC power input conversion to DC power output, output power conversion device, control/regulation system, etc., can solve the problems of large volume, low power density, etc., to reduce volume, Increased power density, easy to achieve effect of control method

Active Publication Date: 2019-09-27
SOUTHEAST UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The present invention is aimed at the problems existing in the prior art, and provides a DAB-type DC transformer sub-module topology with high power density and its control method. problem, a high power density DAB DC transformer sub-module topology and its control method are proposed

Method used

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  • High-power density DAB-type DC transformer submodule topology and control method thereof
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  • High-power density DAB-type DC transformer submodule topology and control method thereof

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Embodiment 1

[0021] Embodiment 1: as figure 1 As shown, a high power density DAB type DC transformer sub-module topology, four half-bridges are connected in series on the input side of the sub-module topology to reduce the voltage stress of each switching device, and the secondary side is a traditional full-bridge structure. By connecting multiple half bridges in series on the primary side and sharing a full bridge on the secondary side, the number of modules is effectively reduced, the volume of the entire DC transformer is reduced, and the power density is increased. Like the traditional DAB converter, this sub-module also controls the transmission power of the system by adjusting the phase shift angle of the primary and secondary sides. In terms of its control strategy, an asymmetric duty cycle control strategy is adopted, so that the switching frequency of the switching tube on the primary side of the transformer is half that of the switching tube on the secondary side, which reduces t...

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Abstract

The invention discloses a high-power density DAB-type DC transformer submodule topology, which comprises two input voltage dividing capacitors Cin1 and Cin2, a converter primary side, a converter secondary side, and an output capacitor Co, wherein the input end of the converter primary side is connected in parallel to the two ends of the corresponding input voltage dividing capacitor Cin; the converter primary side is coupled to the converter secondary side through a magnetic circuit; the output end of the converter secondary side is connected in parallel to the two ends of the output capacitor Co. The submodule topology input side serially connects four half-bridges to reduce the voltage stress of each switching device, and the secondary side has the traditional full-bridge structure. In a mode with multiple half-bridges serially connected at the primary side and one full bridge shared at the secondary side, the number of modules is effectively reduced, the size of the whole DC transformer is reduced, and the power density is thus improved.

Description

technical field [0001] The invention relates to a sub-module topology of a transformer, in particular to a sub-module topology of a DAB type DC transformer with high power density and a control method thereof, belonging to the technical field of power electronics. Background technique [0002] As an important branch of power electronics integration technology, the multi-converter series-parallel system has been a research hotspot in recent years. Since the multi-module series-parallel system has the advantages of reducing development difficulty, facilitating expansion, realizing system redundancy, and high reliability, it is widely used in systems such as distributed power generation, power electronic transformers, and uninterruptible power supplies. For multi-converter series-parallel systems, systems with different series-parallel combinations are used in different situations. Taking the ISOP system as an example, it is suitable for high voltage input and high current out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33576H02M1/0054Y02B70/10
Inventor 陈武舒良才何晓坤薛晨炀
Owner SOUTHEAST UNIV
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