Distribution Network Level High Frequency Isolated Flexible DC Converter

A high-frequency isolation and flexible DC technology, which is applied in the direction of output power conversion devices, reversible conversion equipment, electrical components, etc., can solve the problems of single power conversion form, few applications in the distribution network field, and poor interface matching. , to achieve the effect of shortening engineering design and processing cycle, facilitating system maintenance and redundant design, and low cost

Active Publication Date: 2020-08-14
TBEA SUNOASIS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional flexible direct transmission and distribution technology requires power frequency transformers to complete the functions of step-up and down, electrical isolation, etc., which is costly, occupies a large area, has a single form of power conversion, and poor interface matching, so it is rarely used in the field of distribution networks.

Method used

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  • Distribution Network Level High Frequency Isolated Flexible DC Converter
  • Distribution Network Level High Frequency Isolated Flexible DC Converter
  • Distribution Network Level High Frequency Isolated Flexible DC Converter

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Embodiment Construction

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] Such as figure 1 , figure 2 and image 3 As shown, the present invention consists of 3n figure 1 and image 3 or 6n figure 2 It is composed of four high-frequency isolated basic power units 1, and n is a positive integer greater than or equal to 2. These high-frequency isolated basic power units 1 are connected to each other to form a distribution network-level flexible DC system. The whole system has a DC input terminal, which can be connected to a high-voltage DC grid, etc.; a three-phase AC output terminal, which can be connected to a high-voltage AC grid, etc.

[0049] Such as Figure 4 As shown, the high-frequency isolated basic power unit 1 includes a non-isolated DC / DC converter 11, an isolated DC / DC converter 12 and a non-isolated DC / AC converter 13 connected in sequence; the non-isolated The input terminal of ...

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Abstract

The distribution network-level high-frequency isolation type flexible DC converter disclosed in the present invention is formed by interconnecting 3n or 6n high-frequency isolation type basic power units, and the high-frequency isolation type basic power units include sequentially connected non-isolation type DC / DC converters, isolated DC / DC converters and non-isolated DC / AC converters; the input terminal of the non-isolated DC / DC converter is used as the DC input terminal of the high-frequency isolated basic power unit, so The output end of the non-isolated DC / DC converter is connected to the input end of the isolated DC / DC converter, and the output end of the isolated DC / DC converter is connected to the input end of the non-isolated DC / AC converter The output terminal of the non-isolated DC / AC converter is used as the AC output terminal of the high-frequency isolation type basic power unit; the invention realizes the bidirectional transmission, electrical isolation, waveform of medium voltage DC power to medium voltage AC power Control and other functions, and at the same time adopt a modular series-parallel design, which is easy to expand and can meet the needs of medium-voltage, medium- and small-capacity power conversion.

Description

technical field [0001] The invention belongs to the technical field of distribution network-level flexible DC power transmission and distribution, and relates to a distribution network-level high-frequency isolated flexible DC converter. Background technique [0002] Flexible DC power transmission and distribution technology is a relatively new type of DC power transmission and distribution technology, and it is an important equipment for building a smart grid. Compared with traditional methods, flexible DC transmission and distribution has strong technical advantages in island power supply, urban distribution network capacity expansion, AC system interconnection, and large-scale wind farm grid connection. Strategic Choice. [0003] Voltage Source Converter High-Voltage Direct Current (VSC-HVDC, Voltage Source Converter High-Voltage Direct Current) technology based on Voltage Source Converter (VSC, Voltage Source Converter) and Pulse Width Modulation (PWM, PulseWidth Modula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/72
CPCH02M7/72H02M1/0067H02M1/0074H02M1/0077
Inventor 黄浪徐鹏李直侯丹郝翔
Owner TBEA SUNOASIS
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