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Hybrid modulation method, controller and system for Z-source three-level inverter

A three-level inverter, hybrid modulation technology, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problems of high switching loss and high switching frequency, eliminate low-frequency oscillation, reduce switching loss, the effect of low switching loss

Active Publication Date: 2019-10-18
SHANDONG UNIV
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Problems solved by technology

However, the above two methods have the problems of high switching frequency and high switching loss.

Method used

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  • Hybrid modulation method, controller and system for Z-source three-level inverter
  • Hybrid modulation method, controller and system for Z-source three-level inverter
  • Hybrid modulation method, controller and system for Z-source three-level inverter

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Embodiment Construction

[0048] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0049] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0050] As introduced in the background technology, the existing solution for Z-source three-level inverter midpo...

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Abstract

The invention discloses a mixed modulation method, controller and system of a Z-source three-level inverter. Among them, the hybrid modulation method of a Z-source three-level inverter of the present invention solves the problem of high switching loss in the existing Z-source three-level inverter method for eliminating the low-frequency oscillation of the midpoint potential. This method combines the zero-sequence component injection and double modulation wave modulation method. By dynamically setting the clipping factor, different modulation schemes are selected under different conditions. Finally, the mixed modulation method is used to coordinate and control the elimination of low-frequency oscillation of the midpoint potential and the boost output. At the same time, the switching loss is minimized.

Description

technical field [0001] The invention belongs to the field of power electronic control, and in particular relates to a hybrid modulation method, controller and system of a Z-source three-level inverter. Background technique [0002] The Z-source three-level inverter combines the three-level topology and the Z-source network structure, retains the advantages of low voltage on the switching devices of the three-level inverter and high-quality output waveform, and has the advantages of the Z-source inverter. Pressure function, and the control does not need to add a dead zone, which improves the reliability of the system and has a wide application prospect. However, the problem of unbalanced midpoint potential of the Z-source three-level inverter still needs to be solved. [0003] In the midpoint potential imbalance problem, the oscillation of the midpoint potential at three times the fundamental frequency is called low frequency oscillation. The low-frequency oscillation of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487
CPCH02M7/487H02M1/0054Y02B70/10
Inventor 陈阿莲刘洪超陈杰杜春水张承慧
Owner SHANDONG UNIV
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