Multi-level inverter and modulation method thereof

An inverter and level technology, which is applied in the field of multilevel inverter and its modulation, can solve the problems of large number of clamping diodes, large volume, increase of system volume and cost, etc., and achieve cost reduction and volume reduction, good Versatility and efficiency-enhancing effects

Inactive Publication Date: 2015-01-07
中冶赛迪电气技术有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] In order to select diodes with the same reverse voltage level in topological circuits, multiple diodes with the same nominal name are usually connected in series in practical applications, such as Figure 1b As shown, due to the dispersion of the diodes and the influence of the stray parameters of the line, the reverse voltages that the diodes with the same nominal value can withstand are not exactly the same, so that the series connection may cause some diodes to be damaged due to overvoltage at both ends, so Need to take voltage equalization measures and RC snubber circuit, but this increases the volume and cost of the system
[0006] to solve Figure 1b Existing problems, put forward an improvement measure, such as Figure

Method used

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  • Multi-level inverter and modulation method thereof
  • Multi-level inverter and modulation method thereof
  • Multi-level inverter and modulation method thereof

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Example Embodiment

[0070] Embodiment one

[0071] see image 3 The topology diagram of the five-level inverter provided by the present invention, the five-level inverter provided by the embodiment of the present invention includes 4 capacitors and 12 switch tubes and each switch tube is connected in antiparallel with a diode, respectively the first switch Tube SA21, second switch tube SA22, third switch tube SA11, fourth switch tube SA12, fifth switch tube SA13, sixth switch tube SA14, seventh switch tube SA23, eighth switch tube SA24, ninth switch tube SA25 , the tenth switching tube SA26, the eleventh switching tube SA15, and the twelfth switching tube SA16.

[0072] The positive terminal of the DC power supply is connected to the first terminal of the first capacitor CA21, the first capacitor CA21 is connected in series with the second capacitor CA22, and the second terminal of the second capacitor CA22 is connected to the negative terminal of the DC power supply.

[0073] The first end of ...

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Abstract

The invention discloses a multi-level inverter. A five-level inverter comprises four capacitors and twelve switch tubes. Each switch tube is reversely connected with a diode in parallel. Compared with a five-level inverter in the prior art, clamping diodes and flying capacitors in the five-level inverter in the prior art are not included, the number of diodes and capacitors is decreased, the cost and size of the inverter are reduced, and the efficiency of the inverter is improved. Meanwhile, the five-level inverter can be extended into the multi-level inverter conveniently, and has better universality.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multilevel inverter and a modulation method thereof. Background technique [0002] At present, multi-level inverters are widely used in medium-voltage and large-capacity applications. The current five-level inverters are mainly diode-clamped and flying capacitor structures. To be introduced below. [0003] see Figure 1a , which is a topology diagram of a conventional diode-clamped five-level inverter. [0004] Figure 1a The diodes in are used for voltage clamping for each switching tube. Although the switching tube devices withstand the same voltage when they are turned off, each clamping diode needs to withstand different reverse current directions, and it is usually necessary to select diodes that withstand different reverse voltage levels. [0005] In order to select diodes with the same reverse voltage level in topological circuits, multiple diodes with the s...

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Application Information

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IPC IPC(8): H02M7/483H02M7/00
CPCH02M7/483
Inventor 绳伟辉干永革童高郝亚川
Owner 中冶赛迪电气技术有限公司
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