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Cascading type six-switch multilevel inverter

A multi-level inverter, six-switch technology, applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc., can solve problems such as difficulty in controlling capacitor voltage balance and increasing the number of switching devices , to reduce the number of switching elements, reduce harmonic content, and optimize system efficiency

Active Publication Date: 2016-11-30
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is necessary to achieve a higher voltage level and number of levels, the number of clamping diode devices or clamping capacitor devices required for the diode clamping multilevel inverter and the flying capacitor clamping multilevel inverter will increase sharply, and there is a problem that the capacitor voltage balance control is difficult
The cascaded H-bridge multilevel inverter is easier to achieve a larger number of levels and voltage levels, but as the voltage level increases, the number of cascaded units of the cascaded H-bridge multilevel inverter also decreases. will increase, and the number of switching devices will increase accordingly

Method used

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  • Cascading type six-switch multilevel inverter
  • Cascading type six-switch multilevel inverter
  • Cascading type six-switch multilevel inverter

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Embodiment Construction

[0025] The specific embodiment of the present invention is as shown in the accompanying drawings.

[0026] figure 1 Shown is a structural schematic diagram of a cascaded six-switch multilevel inverter of the present invention. The inverter is composed of N power units sequentially cascaded; the midpoint of the second bridge arm of the main switch group of the previous power unit is connected with the midpoint of the first bridge arm of the main switch group of the next power unit to form a cascade connection ;The midpoint of the first bridge arm of the main switch group of the first cascaded power unit is the positive output terminal of the inverter, and the midpoint of the second bridge arm of the main switch group of the last cascaded power unit is the inverter negative terminal of the output.

[0027] figure 2 Shown is an implementation of the topology of a cascaded six-switch multilevel inverter power unit. like figure 2 As shown, the power unit is composed of a mai...

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Abstract

The invention discloses a cascading type six-switch multilevel inverter. The cascading type six-switch multilevel inverter comprises multiple power units, wherein each power unit consists of a main switch group and a switch capacitor group, wherein the main switch group adopts a conventional full-bridge structure; the switch capacitor group comprises a switch capacitor, two power switch tubes and three uncontrollable diodes; a first bridge arm midpoint and a second bridge arm midpoint of each main switch group are used as output positive and negative ends of each power unit; and the inverter comprises the multiple power units in a cascading manner in sequence. According to the inverter, each power unit can generate five-level output voltage; when an output voltage of the same number of levels is realized, the number of the power switching devices is greatly reduced; the complexity of the device is lowered as well; and in addition, the cascading type six-switch multilevel inverter has the characteristics of high inversion efficiency and high reliability.

Description

technical field [0001] The invention relates to a cascaded six-switch multilevel inverter, which belongs to the field of inverter technology. Background technique [0002] Under the prospect of wide application of medium and high voltage large-capacity frequency converters and power active filters, multilevel inverters have become an important research hotspot in the field of power electronics power conversion. It has the following advantages: the total harmonic distortion of the output voltage decreases significantly with the increase of the number of levels; under the condition of outputting the same quality voltage waveform, the switching loss is small and the switching frequency is low; compared with the two-level converter , at the phase voltage level, du / dt is significantly reduced. In the high-voltage and large-capacity motor drive, it can effectively prevent the insulation breakdown of the motor rotor winding and improve the electromagnetic interference characteristi...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M7/5387H02M1/32
CPCH02M1/32H02M7/483H02M7/5387H02M1/0038H02M1/007H02M7/4835
Inventor 叶满园肖云煌李宋宋平岗
Owner EAST CHINA JIAOTONG UNIVERSITY
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