Solid-state transformer with medium-voltage direct-current and true bipolar low-voltage direct-current ports

A solid-state transformer, low-voltage DC technology, applied in the field of power systems, can solve problems such as no explanation or report found, and data not yet collected.

Active Publication Date: 2020-04-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, there is no description or report of similar technology to the present invention, and no similar information has been collected at home and abroad

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  • Solid-state transformer with medium-voltage direct-current and true bipolar low-voltage direct-current ports
  • Solid-state transformer with medium-voltage direct-current and true bipolar low-voltage direct-current ports
  • Solid-state transformer with medium-voltage direct-current and true bipolar low-voltage direct-current ports

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Embodiment Construction

[0088] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0089] An embodiment of the present invention provides a solid-state transformer with a medium-voltage direct current and a true bipolar low-voltage direct current port. The solid-state transformer topology includes a modular multilevel converter (MMC) and multiple isolated bidirectional DC-DC converters (Isolated Bidirectional DC / DC Converter, IBDC); where:

[0090] The three-phase output and the positive and negative DC buses of the modular multilevel converter (MMC) respectively form stable med...

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Abstract

The invention provides a solid-state transformer with medium-voltage direct-current and true bipolar low-voltage direct-current ports. The solid-state transformer comprises a modular multilevel converter and a plurality of isolated bidirectional DC-DC converters, the three-phase output of the modular multilevel converter and the positive and negative direct current buses form the stable medium-voltage alternating current and medium-voltage direct current ports respectively, and the input sides of the plurality of isolated bidirectional DC-DC converters are interconnected with the DC side of the modular multilevel converter submodule, wherein a plurality of isolated bidirectional DC-DC converters interconnected with bridge arm sub-modules on the modular multilevel converter are connected inparallel at the output side to form a positive low-voltage DC port, a plurality of isolated bidirectional DC-DC converters interconnected with a lower bridge arm sub-module of the modular multilevelconverter are connected in parallel at the output side to form a negative low-voltage DC port, a bridge arm of the modular multilevel converter adopts a fundamental frequency positive-sequence circulation injection control loop, and the low-voltage direct-current port is the true bipolar port.

Description

technical field [0001] The present invention relates to intelligent distribution network technology, power electronics technology and control technology in the technical field of electric power systems, in particular, to a solid-state transformer with medium-voltage direct current and true bipolar low-voltage direct current ports. Background technique [0002] The massive access of distributed power sources and energy storage, and the rapid development of DC loads make DC power distribution technology have broad application prospects. Compared with AC power distribution technology, DC power distribution technology is better compatible with distributed power sources, energy storage and DC loads (electric vehicles, data centers, communication power stations, etc.), and reduces equipment costs without connecting to inverters. Improve the efficiency of power transmission, reduce the total loss of lines and converters, and avoid problems such as reactive power, frequency, and pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M3/335H02J1/00H02J3/02
CPCH02J1/00H02J3/02H02M3/33584H02M7/219
Inventor 张建文周剑桥冯欣施刚王晗蔡旭
Owner SHANGHAI JIAO TONG UNIV
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