M*N type modular multilevel AC-AC converter topological structure

A modular multi-level, topological structure technology, applied in the direction of converting AC power input to AC power output, electrical components, output power conversion devices, etc., can solve the problem of reducing the power density and reliability of the power conversion system and restricting its popularization and application and other issues, to achieve the effect of easy integration and expansion, broad application prospects, and reduced DC link

Pending Publication Date: 2022-06-21
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, when MMC performs AC-AC conversion, it needs to adopt a back-to-back structure, that is, introduce a DC bus and a huge DC side capacitor, which greatly reduces the power density and reliability of the power conversion system and limits its application in AC-AC applications. Promote application

Method used

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  • M*N type modular multilevel AC-AC converter topological structure
  • M*N type modular multilevel AC-AC converter topological structure
  • M*N type modular multilevel AC-AC converter topological structure

Examples

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Embodiment

[0030] Taking four-phase as an example, the 3×4 modular multi-level AC converter topology is applied to the offshore wind power low-frequency transmission system. The system structure is as follows. image 3 shown, including offshore wind farms, step-up transformers, submarine cables, 3×4 modular multi-level matrix converters, and onshore power grids, in which the power generated by the wind turbines in the offshore wind farms is pooled and combined with the booster The primary side of the transformer is connected, the secondary side of the step-up transformer is connected to the submarine cable, and the power is transmitted to the land. The submarine cable is connected to the input port of the 3×4 modular multi-level matrix converter. The 3×4 modular The output port of the multi-level matrix converter is connected to the onshore power grid to realize power transmission.

[0031] structure as Figure 4 As shown, it includes 3 input ports (a, b, c), 4 output ports (α, β, γ, δ)...

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Abstract

The invention discloses an M * N type modular multi-level AC-AC converter topological structure, which comprises M input ports, N sub-converters and N output ports, the M input ports are connected with each sub-converter at the same time, each sub-converter is connected with one output port, each sub-converter comprises M bridge arm branches, and each bridge arm branch is connected with one output port. Each bridge arm branch is connected with one input port and one output port; each bridge arm branch comprises a bridge arm inductor, one end of each bridge arm inductor is connected with the input port, the other end of each bridge arm inductor is sequentially connected with the K sub-modules in series, and the tail end sub-module is connected with one output port. Different voltage levels are achieved by adjusting the number of modules connected in series in each bridge arm branch, high-voltage high-power direct alternating current-current conversion is achieved through a semiconductor device with a low voltage resistance level, direct current links are reduced, cost and control complexity are reduced, and the power density of the conversion device is improved.

Description

technical field [0001] The invention belongs to the technical field of electric energy conversion circuits, and in particular relates to a topology structure of an M×N type modular multi-level alternating-current converter. Background technique [0002] With the continuous development of electric energy conversion technology, high-voltage and large-capacity AC-AC conversion (AC-AC) power electronic converters have been widely used in research fields such as new energy grid-connected power generation, high-voltage AC transmission, and high-power variable frequency drive. In addition, occasions such as asynchronous grid connection, low-frequency AC power transmission, and long-distance power network interconnection also put forward higher requirements on the voltage level and power capacity of energy conversion equipment. further development of the device. [0003] Currently, back-to-back structures based on traditional two-level voltage source converters (VSCs) and direct AC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/293H02M1/42
CPCH02M5/293H02M1/42
Inventor 刘闯蔡国伟姜宇裴忠晨郭东波朱帝王菁月朱炳达
Owner NORTHEAST DIANLI UNIVERSITY
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