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A Discontinuous Pulse Width Modulation Method for Reducing Common Mode Voltage of Indirect Matrix Converter

A matrix converter, common mode voltage technology, applied in the direction of AC power input conversion to AC power output, AC power input conversion to DC power output, electrical components and other directions, can solve the problem of large energy loss, no consideration of common mode voltage suppression, The converter drives the motor system to narrow the speed regulation range and other problems, so as to achieve the effect of reducing the peak value of common mode voltage and the peak value of common mode.

Active Publication Date: 2021-09-28
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional optimal modulation method is to reduce the common-mode voltage by sacrificing the voltage transmission ratio or the quality of the input and output waveforms, and increasing the number of switching transitions, which leads to problems such as narrow speed range of the converter drive motor system and large energy loss.
In the traditional discontinuous pulse width modulation (DPWM) method, the characteristics of less switching action in DPWM modulation are mainly used to reduce switching loss and improve energy transmission efficiency, but the suppression of common mode voltage is not considered

Method used

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  • A Discontinuous Pulse Width Modulation Method for Reducing Common Mode Voltage of Indirect Matrix Converter
  • A Discontinuous Pulse Width Modulation Method for Reducing Common Mode Voltage of Indirect Matrix Converter
  • A Discontinuous Pulse Width Modulation Method for Reducing Common Mode Voltage of Indirect Matrix Converter

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0042] Such as figure 1 As shown, from the topological point of view, the indirect matrix converter (Indirect matrix converter, IMC) can be regarded as composed of a rectification stage and an inverter stage, and the common-mode voltage u generated by it cm Refers to the voltage between the load midpoint n and the reference ground g, when the IMC drives a three-phase symmetrical load, the output common-mode voltage u cm for:

[0043]

[0044] where v Ag , v Bg , v Cg Indicates the three-phase output phase voltage with ground g as the reference point. put v Ag , v Bg , v Cg Expressed as the switching function of the indirect matrix converter, the common-mode voltage u cm The expression is:

[0045]

[0046] Among them, as shown in Fi...

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Abstract

A discontinuous pulse width modulation method for reducing the common-mode voltage of the indirect matrix converter of the present invention is different from the division of 6 sectors in the traditional rectification stage, subdividing each traditional rectification sector into two small sectors; inverse The variable stage adopts two adjacent effective voltage vectors and a zero voltage vector (V 0 or V 7 ) synthesis modulation, the DC side current is 0 when the inverter stage zero voltage vector acts, and the effective current vector I active The amplitude is 0, and the modulation method of the rectification stage is divided into two parts: 1) When the inverter stage adopts the effective voltage vector, the rectification stage adopts the effective current vector; 2) When the inverter stage adopts the zero voltage vector, the rectification stage The stage adopts a zero-amplitude effective current vector I with a small common-mode voltage amplitude active_0 .

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a discontinuous pulse width modulation method for reducing the common-mode voltage of an indirect matrix converter. Background technique [0002] Matrix Converter (Matrix Converter, MC) is a direct AC-AC AC converter developed on the basis of cycloconverter. It has controllable output voltage waveform, sinusoidal input and output current, controllable input power factor and is independent of With the advantages of limited power factor, high integration and high energy density, it has become a new generation of power conversion device with great potential. The matrix converter can be divided into a direct matrix converter (Direct Matrix Converter, DMC) and an indirect matrix converter (Indirect matrix converter, IMC) from the topological structure. Compared with DMC, IMC requires fewer switching devices and has a more compact structure, so IMC has great potential for de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M7/5395H02M1/12
CPCH02M1/12H02M5/4585H02M7/5395
Inventor 李珊瑚黄林峰王文圣刘旭韩旭刘义平
Owner HEBEI UNIV OF TECH
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