Modulation method for suppressing common mode voltage with matrix converter

A matrix converter and common-mode voltage technology, which is applied in the direction of conversion equipment that can be converted to DC without intermediate conversion, can solve the problems of difficult to meet the safety operation requirements of matrix converters, large amount of calculation, and difficult to calculate by digital processors. , to achieve the effect of reducing the calculation time, reducing the amplitude, and reducing the rate of change

Active Publication Date: 2015-09-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is also difficult to meet the safe working requirements of the matrix converter that only commutates one output phase at a time, and the calculation amount of this method is relatively large, and it is difficult to use mainstream digital processors to complete the calculation

Method used

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  • Modulation method for suppressing common mode voltage with matrix converter
  • Modulation method for suppressing common mode voltage with matrix converter
  • Modulation method for suppressing common mode voltage with matrix converter

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Embodiment Construction

[0039] 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.

[0040] A common-mode voltage suppression modulation method using a matrix converter, in which the matrix converter is a power converter that connects any three-phase input to a three-phase output by nine bidirectional switches arranged in a 3×3 array by Digital Domain, such as figure 1 shown. The matrix converter synthesizes the required output waveform by controlling the high-frequency switching of the bidirectional switch.

[0041] The following Clarck transformation is applied to the input and output three-phase voltage and current values ​​of the matrix converter:

[0042] T = 2 3 1 - 1 ...

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Abstract

The invention discloses a modulation method for suppressing common mode voltage of a matrix converter. The method comprises the following sequential steps of performing singular value decomposition on space vector forms of all on-off state matrixes of the matrix converter, dividing all on-off states of the matrix converter into three types based on the singular value decomposition, preferentially selecting the on-off states with small corresponding common mode voltage values in modulation matrix calculation and an on-off sequence of the matrix converter by utilizing an equivalent relation between different types of on-off states in the matrix converter, and reducing a change rate of output common mode voltage by optimizing the on-off sequence. The modulation method reduces the amplitude and the change rate of the output common mode voltage of the matrix converter, reduces the amplitude and an effective value of the common mode voltage, and ensures low input/output waveform harmonic content of the matrix converter.

Description

technical field [0001] The invention relates to the field of common-mode voltage suppression of power electronic converters, in particular to a modulation method for common-mode voltage suppression using a matrix converter. Background technique [0002] The three-phase matrix converter is a forced-commutation converter that directly connects the three-phase input to the three-phase load through a controllable power semiconductor bidirectional switch array, and can change the voltage and frequency of the output. It consists of nine bidirectional switches arranged in 3×3, any phase of the three-phase input can be connected to any line of the three-phase output, such as figure 1 shown. [0003] When the bidirectional switches of the matrix converter are mathematically idealized as switching functions, the relationship between the voltage and current at the input and output terminals can be expressed as: [0004] V o = ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/22
Inventor 官权学官权升
Owner SOUTH CHINA UNIV OF TECH
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