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Control method of three-phase three-level pwm rectifier based on multi-mode switching

A control method and three-level technology, which can be used in the conversion of AC power input to DC power output, electrical components, high-efficiency power electronic conversion, etc., which can solve the problems of many switching times and large switching losses.

Active Publication Date: 2020-09-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The three-phase three-level PWM rectifier control strategy SVPWM uses 27 switch states to fit the reference voltage vector. The disadvantage is that the switching times of the switch tube in the pulse width modulation period are large, resulting in a large switching loss.

Method used

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  • Control method of three-phase three-level pwm rectifier based on multi-mode switching
  • Control method of three-phase three-level pwm rectifier based on multi-mode switching
  • Control method of three-phase three-level pwm rectifier based on multi-mode switching

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Embodiment Construction

[0028] Step A is as follows:

[0029] Such as figure 2 Shown is the spatial distribution of eighteen working modes. The six working sectors are divided into the first sector, 0 ~60 degrees; the second sector, 60~120 degrees; the third sector, 120~180 degrees; the fourth sector, 180~240 degrees; the fifth sector, 240~300 degrees; the sixth sector, 240 degrees ~360 degrees. Its working interval distribution corresponds to image 3 shown. Let the three-phase rectifier voltage vector U ref , given U ref Amplitude and phase angle, on the static coordinate α-β two-phase coordinate axis, U ref Components above it are denoted by U α and U β to represent, its sector is determined by the following formula (1):

[0030]

[0031] If X>0, then m=1, otherwise m=0; if Y>0, then n=1, otherwise n=0; if Z>0, then p=1, otherwise p=0. Let S=m+2n+4p, then when S=3, the voltage vector is located in the first sector N1; when S=1, the voltage vector is located in the second sector N2; w...

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Abstract

The invention discloses a multi-mode switching three-phase three-level PWM rectifier control method. The method is realized through different combined control of eighteen working modes in six different working sectors, and specifically includes the following steps: 1) Determine the large sector N where the input reference voltage vector of the three-phase three-level PWM rectifier is located; 2) Determine the small triangle area n where the reference voltage vector is located, and obtain three operating modes corresponding to the sector where the synthetic voltage vector is located; 3 ) determine the working time of the three working modes; 4) generate the switching sequence of the three working modes according to the working time; 5) control the synthetic voltage vector of the three working modes according to the switching sequence, and output the DC voltage. Compared with the SVPWM control strategy, the control method of the present invention reduces the number of circuit modes by 1 / 3 and the switching times of the power switch tube by 2 / 3, thereby effectively reducing the number of three-phase three-level PWM rectifiers when the same DC voltage is output. switching loss.

Description

technical field [0001] The invention relates to the technical field of PWM rectifier control and belongs to the application field of electric energy conversion. Background technique [0002] As an indispensable power electronic device in industrial applications, three-phase rectifiers are widely used in various production sectors of the modern national economy such as electric power, electronics, communications, transportation, medical and health care, and people's daily life. However, as the power of the three-phase rectifier increases and the switching frequency of the power switch tube increases, the switching times of the switch tube within the pulse width modulation cycle increases with the increase of the switching frequency, which makes the switching loss of the power switch tube increase. The larger it is, it has become a key issue restricting the development of high power density rectifiers. [0003] At present, the commonly used three-phase three-level rectifier c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
CPCH02M7/219H02M1/0054Y02B70/10
Inventor 李志忠杨慧刘东峰童怀李优新
Owner GUANGDONG UNIV OF TECH