Novel four-switch five-level inverter

A five-level, four-switch technology, applied in the field of new four-switch five-level inverters, can solve the problems of reducing device power density, increasing device volume, and increasing device cost, so as to reduce switching loss and reduce device volume , the effect of improving efficiency

Inactive Publication Date: 2020-06-05
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The increase of components increases the cost of the device, reduces the efficiency and increases the volume of the device, and reduces the power density of the device

Method used

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  • Novel four-switch five-level inverter
  • Novel four-switch five-level inverter
  • Novel four-switch five-level inverter

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Embodiment Construction

[0037] The technical solution of the present invention will be described below in conjunction with the accompanying drawings and embodiments, so that those skilled in the art can better understand the present invention.

[0038]The present invention proposes a novel single-phase five-level inverter topology. The inverter has three bridge arms in structure, wherein the first and second bridge arms are respectively composed of a switching device and a diode connected in series. Two of the four ports of the polar coupling reactor are respectively connected to the two bridge arms, and the equivalent inductance of the leakage inductance of the coupling reactor is connected in series with the output filter inductance, which effectively reduces the total harmonics of the output current / voltage Distortion rate (THD), improved power quality. In the working mode, using the voltage equalization characteristics of the reverse polarity coupling reactor, only 4 switching devices and fewer a...

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Abstract

The invention provides a novel four-switch five-level inverter. The inverter is composed of a five-level inversion part, an LC filtering part and a load part. The five-level inversion part is composedof a direct current source Vin, a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a first diode D1, a second diode D2 and a reversed polarity couplingreactor T, the filtering part is composed of an output filter reactor L0 and an output filter capacitor C0, and the first bridge arm is obtained by connecting a first switching tube S1 and a second diode D2 in series. The second bridge arm is obtained by connecting a second switching tube S2 and a first diode D1 in series, and the third bridge arm is obtained by connecting a third switching tube S3 and a fourth switching tube S4 in series. The two ports at the left end of the reverse coupling reactor T are respectively connected with an emitter of the first switch tube S1 and a collector of the second switch tube S2, and the two ports at the right end of the reverse coupling reactor T are short-circuited and are connected with the left end of the output filter reactor L0.

Description

technical field [0001] The invention belongs to the technical field of power electronic electric energy conversion, and in particular relates to a novel four-switch five-level inverter. Background technique [0002] The application of inverters has been applied in various fields, from milliwatt-level LCD backlight inverter circuits to 100-megawatt high-voltage direct current transmission converter stations; from household inverter air conditioners, inverter refrigerators to airborne equipment in the aviation field; From conventional fossil energy power generation equipment to today's new energy power generation equipment, inverter power supplies are indispensable. However, the limitations of the material and process level of the power electronic device itself lead to conflicts between its power handling capability and switching frequency. Often the greater the power, the lower its switching frequency. Therefore, in order to realize the high frequency and low EMI of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/12
CPCH02M1/126H02M7/53871H02M1/0054Y02B70/10
Inventor 潘健陈庆东刘松林吕磊陈凤娇张琦刘雨晴熊嘉鑫刘孙德
Owner HUBEI UNIV OF TECH
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