A two-stage cascaded multilevel inverter

A cascaded multi-level, inverter technology, applied in electrical components, conversion devices of AC power input to DC power output, output power, etc., can solve problems such as low cost, high reliability, voltage spikes, etc. Achieve cost savings, ensure waveform quality, and eliminate voltage spikes

Active Publication Date: 2019-06-18
SOUTH CHINA UNIV OF TECH
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a two-stage cascaded multilevel inverter for the shortcomings of the existing cascaded multilevel topology, which solves the problems existing in the output voltage base of the traditional cascaded switch-diode inverter. The problem of voltage spikes has the advantages of low cost and high reliability

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  • A two-stage cascaded multilevel inverter
  • A two-stage cascaded multilevel inverter
  • A two-stage cascaded multilevel inverter

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0035] A two-stage cascaded multi-level inverter is formed by connecting a front-stage unit and a rear-stage unit in series, and the front-stage unit is composed of n switch-diode units and an additional spike elimination switch; any A switch-diode unit i (1≤i≤n) connects a DC power supply or a capacitor across two DC buses, and connects a series circuit composed of a switch and a diode in series; the DC of the i-th switch-diode unit The negative terminal of the power supply is connected to the connection point of the switch and the diode of the i+1th switch-diode unit, and the diode in the first switch-diode unit can be omitted; the additional spike elimination switch is connected across the second switch - Between the switch-diode connection point of the diode unit and...

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Abstract

The invention discloses a two-stage cascaded multilevel inverter, which is composed of a front-stage unit and a rear-stage unit connected in series, and the front-stage unit is composed of n switch-diode units and a spike elimination switch ; Wherein the negative terminal of the DC power supply of the i-th switch-diode unit is connected to the connection point of the switch and the diode in the i+1 switch-diode unit; the spike elimination switch is connected across the switch and the diode in the second switch-diode unit Between the connection point and the negative terminal of the DC power supply of the nth switch-diode unit; the connection point of the switch and the diode in the first switch-diode unit leads to the terminal A of the input side of the subsequent unit, and the DC of the last switch-diode unit The negative terminal of the power supply leads to terminal B of the subsequent unit; the latter unit is an H-bridge inverter circuit. The invention solves the problem of the voltage peak existing in the output voltage base of the traditional cascaded switch-diode inverter, and has the advantages of low cost and high reliability.

Description

technical field [0001] The invention belongs to the field of inverters, in particular to a two-stage cascaded multilevel inverter. Background technique [0002] With the development of power electronics technology, inverters are used more and more widely. The multi-level inverter has been widely used in the fields of medium and high voltage speed regulation and new energy power generation due to its advantages of large output capacity, low harmonic content of output voltage and current, and low reverse voltage of the switching tube. [0003] Compared with traditional inverters, the outstanding disadvantage of multilevel inverters is that as the number of levels increases, the number of power electronic full-control devices required increases accordingly. Although the switching devices of the multi-level inverter do not need high withstand voltage because the voltage is evenly distributed among the switching devices or unit modules, each fully-controlled power electronic dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M1/32
CPCH02M1/32H02M7/483H02M1/325H02M7/4835
Inventor 吴青华王磊罗鸿轩
Owner SOUTH CHINA UNIV OF TECH
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