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A Cascaded Flexible AC Link Converter Topology

A topology and converter technology, applied in the direction of converting AC power input to AC power output, conversion equipment that can be converted to DC without intermediate conversion, power transmission AC network, etc., can solve the problem of reducing converter efficiency, no demand, High cost and other issues, to achieve the effect of improving efficiency and reliability, reducing volume and cost, and improving reliability

Active Publication Date: 2021-08-31
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some characteristics of MMC type VSC-HVDC may be unfavorable for its application in distribution network
MMC adopts AC / DC / AC two-stage power conversion based on fully controlled devices (such as IGBT), which reduces the efficiency of the converter and increases the difficulty of DC side fault protection
In addition, a large number of DC-side capacitors must be used in the MMC topology, which will lead to excessively large and costly equipment
A huge advantage of MMC-based SNOP equipment is that it can realize asynchronous interconnection, but there is almost no demand for this in the distribution network

Method used

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  • A Cascaded Flexible AC Link Converter Topology
  • A Cascaded Flexible AC Link Converter Topology
  • A Cascaded Flexible AC Link Converter Topology

Examples

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] Such as figure 1 , figure 2 As shown, the present invention has a cascaded flexible AC link converter topology, including a three-phase AC power supply, three power regulation units, three Buck-type direct AC-AC converters UT-AC, three-phase multi-winding isolation Transformer, 3 LC low-pass filters; among them, each power adjustment unit is composed of two bipolar direct AC-AC converters BT-AC;

[0044] A feeder end node A, B, C three-phase AC power supply is connected to the primary side of the three-phase multi-winding isolation transformer; the secondary side of the three-phase multi-winding isolation transformer has a total of 9 windings, each single-phase 3 windings, each The three single-phase windings respectively supply power for one UT-AC and two BT-ACs; the negative pole of the output port of the A-phase UT-AC converter i...

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Abstract

The invention discloses a topology structure of a cascaded flexible AC link converter, which includes a three-phase AC power supply, three power adjustment units, three Buck-type direct AC-AC converters UT-AC, and a three-phase multi-winding isolation transformer , 3 LC low-pass filters; wherein, each power adjustment unit is composed of two bipolar direct AC-AC converters BT-AC. The topology structure of the present invention can control the power flow between the interconnected feeders, and realize the flexible interconnection of the distribution network feeder. In the case of faults, the recovery power supply for the isolated load can be realized; through the flexible interconnection of the feeder lines in the distribution network, the distributed The penetration rate of power generation in the distribution network improves the power quality and power supply reliability of the distribution network.

Description

technical field [0001] The invention belongs to the technical field of flexible interconnection of distribution networks, and in particular relates to a topology structure of a cascaded flexible AC link converter. Background technique [0002] The sharp increase in the grid-connected capacity of distributed renewable energy power generation, the large-scale access of new loads represented by electric vehicles, the constant changes in the structure and types of power sources, and the increasing diversification of load characteristics have already affected the current distribution network. had a wide-ranging and far-reaching impact. The main manifestations are: the power flow direction is becoming more and more complicated, the load fluctuation is intensified, the radial structure of single power supply becomes an active network structure, the power quality problems such as voltage limit are becoming more and more prominent, and the reliability of power supply is reduced. Ren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/10H02M5/293H02J3/36H02J3/38
CPCH02J3/36H02M5/10H02M5/293H02M1/007Y02E60/60
Inventor 刘闯蔡国伟朱炳达张瀚文郭东波王艺博
Owner NORTHEAST DIANLI UNIVERSITY
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