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Composite multi-level power conversion circuit and method

A conversion circuit and multi-level technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve problems such as complex topology and difficult balance of capacitor voltage, and achieve simplified topology , Modulation strategy is simple, the effect of more output levels

Active Publication Date: 2019-12-13
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the mid-point clamp type and flying capacitor type converters have disadvantages such as complex topology and difficult balance of capacitor voltage; although the cascaded H-bridge type converter has the advantages of simple modular structure and easy output control, but with the output The increase in the number of levels requires a large number of isolated DC power supplies, which limits their application in engineering to a certain extent

Method used

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  • Composite multi-level power conversion circuit and method
  • Composite multi-level power conversion circuit and method
  • Composite multi-level power conversion circuit and method

Examples

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Embodiment 1

[0028] as attached figure 1 And attached figure 2 As shown, a composite multi-level power conversion circuit includes a single DC bus power supply, a bus voltage dividing capacitor unit, an H bridge unit and at least one switched capacitor unit; the bus voltage dividing capacitor unit includes a capacitor string, a positive string Bridge arm I and positive series bridge arm II; the capacitor string is connected in parallel with the DC bus power supply; one end of the positive series bridge arm I is respectively connected to the anode of the DC bus power supply and one end of the capacitor string, The other end of the positive series bridge arm I is respectively connected to the midpoint of the capacitor string and one end of the positive series bridge arm II, and the other end of the positive series bridge arm II is connected to the other end of the capacitor string respectively. One end and the cathode of the DC bus power supply; each of the switched capacitor units include...

Embodiment 2

[0032] This embodiment provides a specific implementation of a bus voltage dividing capacitor unit, the bus voltage dividing capacitor unit includes an electrolytic capacitor C a , electrolytic capacitor C b , switch tube S 1 , switch tube S 2 , switch tube S 3 and switch tube S 4 ; The electrolytic capacitor C a and the electrolytic capacitor C b Constitute the capacitor string, the switch tube S 1 and the switching tube S 2 Constitute the positive series bridge arm I, the switching tube S 3 and the switching tube S 4 Constitute the positive series bridge arm II; wherein, the electrolytic capacitor C a The anode of the switching tube S 1 input and the DC bus supply V dc connected to the anode of the switching tube S 1 The output terminal of the switching tube S 2 The input terminal is connected; the switch tube S 2 The output terminals are respectively connected with the switching tube S 3 The input terminal, the electrolytic capacitor C a the cathode and the ...

Embodiment 3

[0058] This embodiment provides a specific implementation manner of the expanded composite multilevel power conversion circuit. as attached Figure 16 As shown, the present invention can further improve the quantity and boost gain of the output level of the composite multilevel power conversion circuit by setting a plurality of switched capacitor units connected in parallel by expanding the switched capacitor unit; when the switched capacitor unit When the number of is greater than 1, multiple switched capacitor units are connected in parallel.

[0059] That is to say, when the number of switched capacitor units N=1, the composite multi-level power conversion circuit outputs nine different levels at most; when the number of switched capacitor units N≥2, the composite multi-level power conversion circuit The level power conversion circuit has 4N+5 working modes, that is, every time a switched capacitor unit is added, the number of output levels of the composite multi-level pow...

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Abstract

The invention provides a composite multi-level power conversion circuit and method. The composite multi-level power conversion circuit comprises a single DC bus power supply, a bus voltage-dividing capacitor unit, an H bridge unit and at least one switch capacitor unit. The bus voltage-dividing capacitor unit comprises a capacitor bank string, a first positive string bridge arm and a second positive string bridge arm; each switch capacitor unit comprises a third positive string bridge arm, a switch capacitor and a middle bridge arm; the H bridge unit comprises a left bridge arm and a right bridge arm; the midpoint of the left bridge arm and the midpoint of the right bridge arm are used as the AC voltage output ends of the composite multi-level power conversion circuit; the composite multi-level power conversion circuit is provided with nine working modes which are a first working mode, a second working mode, a third working mode, a fourth working mode, a fifth working mode, a sixth working mode, a seventh working mode, an eighth working mode and a ninth working mode. The composite multi-level power conversion circuit and the method have the advantages of few power devices, multipleoutput levels and simple modulation strategy.

Description

technical field [0001] The invention relates to the fields of electric energy conversion and new energy power generation, and specifically relates to a composite multilevel power conversion circuit and method. Background technique [0002] The problem of environmental pollution caused by traditional fuel energy is becoming more and more serious, which has attracted great attention of human beings. As their alternative energy sources - renewable energy, especially solar energy, will occupy an increasingly important position in the future global energy pattern. In the field of renewable energy utilization such as photovoltaic power generation, multilevel converters have received extensive attention from researchers; multilevel converters can reduce the total harmonic distortion of the output waveform by increasing the number of levels of the output ladder wave voltage, and then Improve the output power quality and other advantages. [0003] Traditional multilevel DC / AC conve...

Claims

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 王要强王凯歌李忠文海德伦王金凤章健梁军袁艺森
Owner ZHENGZHOU UNIV
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