A Modular High Voltage Transmission Ratio DC Transformer Topology and Control Method

A technology of DC transformer and topology structure, which is applied in the direction of converting DC power input into DC power output, adjusting electrical variables, and controlling/regulating systems, etc. The effect of low cost and small number of modules

Active Publication Date: 2022-03-22
SOUTHEAST UNIV
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Problems solved by technology

[0003] In order to solve the deficiencies mentioned in the above-mentioned background technology, the purpose of the present invention is to provide a modular high voltage transmission ratio DC transformer topology and control method, which solves the problem of high voltage transmission ratio DC transformers in the case of medium and high voltage DC bus interconnection. , the number of modules is large, the problem of high cost and large volume

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  • A Modular High Voltage Transmission Ratio DC Transformer Topology and Control Method

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[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] A modular high voltage transfer ratio DC transformer topology such as figure 1 As shown, the topology consists of a high voltage filter capacitor C HV , High voltage filter inductor L HV , high-voltage side thyristor, N power module groups, low-voltage filter inductor L LV with low voltage filter capacitor C LV composition.

[0027] Each power module group includes an input port and an output port. After N power module group inputs are connected in serie...

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Abstract

The invention relates to the field of DC transformers, in particular to a modular high-voltage transmission ratio DC transformer topology structure and a control method. The topology structure consists of a high-voltage filter capacitor C HV , high voltage filter inductor L HV , high-voltage side thyristor, N power module groups, low-voltage filter inductor L LV with low voltage filter capacitor C LV composition. Each power module group includes an input port and an output port. After the input of N power module groups is connected in series, the high-voltage side thyristor, high-voltage filter inductor, high-voltage filter capacitor and low-voltage filter capacitor are connected to form a high-voltage DC port; N power module groups output After parallel connection, connect the low-voltage filter inductor and the low-voltage filter capacitor to form a low-voltage DC port. Compared with the traditional DC transformer, the present invention has the advantages of fewer modules, low cost and small volume. The DC transformer topology in the present invention only uses a small number of half bridges, which can realize DC voltage conversion with high transmission ratio, thereby reducing DC voltage. Transformer cost, improve power density.

Description

technical field [0001] The invention relates to the field of direct current transformers, in particular to a modular high voltage transmission ratio direct current transformer topology and control method. Background technique [0002] With the popularization of renewable energy such as photovoltaics and wind energy and the rapid development of DC transmission and distribution technology, the interconnection of DC transmission and distribution networks with different voltage levels and structures has become a development trend. DC transformers can connect DC transmission and distribution networks of different voltage levels, improving the flexibility and reliability of DC transmission and distribution, and its importance has become increasingly prominent. The MMC structure has the advantages of modularization and good fault handling capabilities, and is widely used in high-voltage direct current transmission and power electronic transformers and other occasions. When the DC ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M1/088
CPCH02M3/156H02M1/088
Inventor 陈武金浩哲舒良才李容冠兰建西
Owner SOUTHEAST UNIV
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