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Narrow pulse suppression and electric energy quality improvement method for matrix converter

A matrix converter, power quality technology, applied in the direction of conversion equipment, electrical components, output power conversion devices, etc. that can be converted to direct current without intermediate conversion

Inactive Publication Date: 2012-07-04
TIANJIN UNIV
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Problems solved by technology

[0014] The present invention proposes an improved dual-voltage modulation method for narrow pulses and distortion of input and output modulation waveforms under dual-voltage modulation

Method used

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  • Narrow pulse suppression and electric energy quality improvement method for matrix converter
  • Narrow pulse suppression and electric energy quality improvement method for matrix converter
  • Narrow pulse suppression and electric energy quality improvement method for matrix converter

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Embodiment Construction

[0056] According to the principle of dual voltage modulation, the output line voltage of the matrix converter is obtained by synthesizing the input line voltage and zero voltage. In the present invention, when the action time of the above voltage is less than the safe commutation time, the modulation function is reconstructed by forcing the action time to be zero to solve the narrow pulse problem. described as follows:

[0057] figure 1 (a) is the basic structure of a three-phase-three-phase matrix converter.

[0058] v ia , v ib , v ic and i ia i ib i ic Indicates the three-phase input phase voltage and current; v oA , v oB , v oC and i oA i oB i oC Indicates the three-phase output phase voltage and current; S kj (k=A, B, C; j=a, b, c) represents bidirectional power switches connected to corresponding input and output phases. In practice, the two-way switch is composed of a combination of discrete devices, such as figure 1 (b) shown.

[0059] The dual-voltage...

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Abstract

The invention discloses a narrow pulse suppression and electric energy quality improvement method for a matrix converter. The method is characterized in that: the matrix converter adopts double-voltage modulation; and when control signals of six switches for line voltage synthesis have narrow pulses in a certain switching period, six groups of new modulation functions for switch control are reconstructed and calculated according to the positions of the narrow pulses. The new functions are characterized in that: the new functions comprise instantaneous output current detection information; one of the six switches is kept in an off state; and the modulation functions simultaneously meet input current and output voltage modulation requirements. On the premise of no increase of the switching loss and the number of commutation times of the matrix converter, the number of the narrow pulses is effectively decreased, and the input and output waveform quality of the matrix converter is improved; and the method is particularly suitable for middle and high power places in which commutation time is long.

Description

technical field [0001] The invention belongs to the field of power converter control for driving motors, in particular to a control method for a three-phase matrix converter under dual-voltage modulation, which is used to eliminate narrow pulses in the modulation process to avoid output voltage and input current caused by narrow pulses Distortion problem. Background technique [0002] As an AC-AC single-stage power converter, Matrix Converter (MC) has attracted extensive attention in the field of transmission due to its outstanding advantages in power quality, power density, energy regeneration, and structural volume. At present, with the further improvement of matrix converter modulation strategy, commutation technology, input and output waveform quality, and operation stability, the motor speed control system fed by matrix converter has been used in wind power generation, elevator traction, machinery manufacturing, etc. Applications in the industrial field. [0003] The ...

Claims

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Application Information

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IPC IPC(8): H02M5/22H02M1/12
Inventor 夏长亮阎彦史婷娜李萌陈炜
Owner TIANJIN UNIV
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