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Nine-level inverter by adopting asymmetric voltage source

A technology of inverters and voltage sources, applied in the field of nine-level inverters, can solve the problems of increasing the number of switching devices and increasing the number of units, and achieve the effects of reducing switching losses, improving efficiency, and reducing complexity

Pending Publication Date: 2020-09-04
EAST CHINA JIAOTONG UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

However, as the voltage level increases, the number of cascaded units of the cascaded H-bridge multilevel inverter will also increase, and the number of switching devices will increase accordingly.

Method used

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  • Nine-level inverter by adopting asymmetric voltage source
  • Nine-level inverter by adopting asymmetric voltage source
  • Nine-level inverter by adopting asymmetric voltage source

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Embodiment Construction

[0030] figure 1 A schematic structural diagram of a nine-level inverter using an asymmetrical voltage source is shown in the present invention. The inverter is composed of a DC power supply group (SC) and a full-bridge switch group (SW).

[0031] The DC power supply group SC of the inverter in this embodiment is composed of the first DC power supply V dc1 , the second DC power supply V dc2 , fifth switching tube S5, sixth switching tube S6, seventh switching tube S7, eighth switching tube S8, ninth bidirectional switching tube S9, fifth diode D5, sixth diode D6, seventh diode tube D7, the eighth diode D8, and the ninth bidirectional diode D9; the anode of the fifth diode D5, the emitter of the fifth switching tube S5 and the positive pole V of the second DC power supply dc2 Connected to the first node Q1; the anode of the sixth diode D6, the anode of the seventh diode D7, the emitter of the sixth switch S6, the emitter of the seventh switch S7 and the second DC power supply...

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Abstract

The invention relates to a nine-level inverter by adopting an asymmetric voltage source. The inverter comprises a direct-current power supply group and a full-bridge switch group. The direct-current power supply group is composed of two direct-current power supplies, four unidirectional power switch tubes, a bidirectional power switch tube and six uncontrollable diodes, the full-bridge switch group is of a traditional full-bridge structure, the direct-current power supply group is connected with the input end of the full-bridge switch group, and the midpoint of a first bridge arm and the midpoint of a second bridge arm of the full-bridge switch group are output ends of the inverter. According to the nine-level inverter, an asymmetric voltage is used as a direct-current power supply, compared with a multi-level inverter of a traditional structure, under the same output voltage level, the number of power switch devices and the complexity of the device are greatly reduced, the manufacturing and maintaining cost of the inverter is effectively reduced, and meanwhile the efficiency of the inverter and the reliability of the system are improved.

Description

technical field [0001] The invention relates to the field of power electronic power conversion, in particular to a nine-level inverter using an asymmetrical voltage source. Background technique [0002] At present, multilevel inverters have become an important research hotspot in the field of power electronic power conversion, and are widely used in the field of medium and high voltage speed regulation and flexible AC transmission systems. 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, d u / d t Significantly reduced, in the drive of high-voltage and large-capacity motors, it can effectively prevent the insulation breakdown of the motor rotor winding, and at the same time i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5388
CPCH02M7/483H02M7/5388
Inventor 叶满园任威李宋
Owner EAST CHINA JIAOTONG UNIVERSITY
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