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Cascad multi-level inverter

A multi-level inverter and cascading technology, applied to electrical components, irreversible DC power input conversion to AC power output, AC power input conversion to DC power output, etc., can solve the problem of system reliability degradation, multiple Unit cascading, increasing system complexity and other issues

Inactive Publication Date: 2005-06-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

When outputting a higher voltage, this topology requires the use of more unit cascading, increasing the complexity of the system, resulting in a decrease in system reliability

Method used

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  • Cascad multi-level inverter
  • Cascad multi-level inverter
  • Cascad multi-level inverter

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Experimental program
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Embodiment Construction

[0037] The principle of the cascaded multilevel inverter of the present invention is further described below in conjunction with the accompanying drawings:

[0038] The basic modules constitute a cascaded multilevel inverter. The basic idea of ​​this topology is to cascade multiple basic modules, and the output voltage will be the synthesis of the output voltage of each basic module. Assuming that the first basic module and DC bus voltage V of the second basic module 1 =V 2 =2E, it is not difficult to draw that the first basic module and the second basic module can output -2E, -E, O, +E, +2E, a total of five levels, obviously when V 1 =V 2 When =2E, phase A can output 9 levels of voltage: -4E, -3E, -2E, -E, O, +E, +2E, +3E, +4E. At this time, the number of levels of the phase voltage of the inverter is 9 levels.

[0039] Image 6 An embodiment of the present invention shown is a three-phase hybrid asymmetric cascaded inverter based on basic modules, and the number of casc...

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Abstract

This invention relates to a cascade multilevel inverter, which is a topological structure of the cascade multilevel inverter used in high-voltage and power condition, reducing the number of the elements in the condition of outputting as the same amount of the level as the traditional inverter, predigesting its structure and control. The multilevel inverter is based on the asymmetry 5 of the basic modules, and compounds the output voltage, the number of the cascade basic modules are 2-8; can get the 9, 13 electrical levels and increase the number of the level without increasing the number of the switch and improve the quality of the wave; when the inverter is at work, the first and the second modules simultaneously supply power to the negative carrier, the active cycle current does not exist between the modules.

Description

Technical field [0001] The invention belongs to multi-level power conversion technology, and specifically relates to a topological structure of a multi-level power conversion inverter. Background technique [0002] Multi-level power conversion technology and its ideas have been a hot topic in high-voltage and high-power application research in recent years. It can be applied in many high-voltage and high-power fields. Among the many traditional cascaded multi-level topologies, the Chinese invention patent application with application number: 00136733.1 has become a hot spot for research and application in the field of high-voltage and high-power applications due to its modular structure, redundancy and many other advantages. The traditional cascade topology uses the traditional full-bridge unit (H-bridge unit) as the basic module, and then synthesizes the output voltage through the cascade of these modules. When outputting higher voltages, this topology requires the use of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/487H02M7/5388H02M7/4835H02M1/0095
Inventor 邹云屏丁凯金红元吴智超
Owner HUAZHONG UNIV OF SCI & TECH
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