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A Method to Eliminate Distortion of Vienna Rectifier's Current Zero Crossing Point

A zero-crossing distortion and rectifier technology, which is applied in the direction of converting AC power input to DC power output, electrical components, and high-efficiency power electronics conversion, can solve problems such as power factor reduction, improve power factor, and eliminate current zero-crossing distortion. Effect

Active Publication Date: 2022-04-08
JIANGSU XINTONG AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, it solves the problem of power factor reduction caused by eliminating the current zero-crossing distortion

Method used

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  • A Method to Eliminate Distortion of Vienna Rectifier's Current Zero Crossing Point
  • A Method to Eliminate Distortion of Vienna Rectifier's Current Zero Crossing Point
  • A Method to Eliminate Distortion of Vienna Rectifier's Current Zero Crossing Point

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Embodiment 1

[0036] This embodiment provides a control method for eliminating the zero-crossing distortion of the VIENNA rectifier current, such as figure 1 shown, including the following steps:

[0037] The topology of the VIENNA rectifier is as figure 2 shown. For the convenience of analysis, it can be considered that the value and direction of the three-phase current are almost constant in a carrier cycle. R L is the load; C 1 、C 2 is the upper and lower capacitors on the DC side; S is the switch tube; D is the uncontrolled diode; L s and R s are the inductance value and resistance value of the input inductance of the three-phase AC side respectively; e x (x=a, b, c) is the phase voltage of the three-phase AC grid; i x Input current for grid side; u x Output voltage for the rectifier bridge arm.

[0038] Define the switch function S x (x=a, b, c) indicates the state of the inner tube. When the inner tube conducts, S x = 1; when the inner tube is closed, S x =0. When S x...

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Abstract

The invention relates to a method for eliminating current zero-crossing point distortion of a VIENNA rectifier, comprising the following steps: collecting grid voltage information; performing energy analysis through the rectifier, and calculating the current component of the d-axis grid side according to the active power provided by the rectifier DC side to the load; The geometric relationship between the grid voltage vector, the grid-side input current vector and the rectifier output voltage vector when the unknown q-axis grid-side current component is input; according to the critical condition of the current zero-crossing point and the geometric relationship obtained in step S3, the injection-specific q The current component of the grid side; the switching sequence of the switching tube is determined according to the output voltage vector of the rectifier. The method enables the VIENNA rectifier to completely eliminate the output voltage distortion when the current zero-crossing point is running. Compared with the method of eliminating the current zero-crossing point distortion by the rectifier output voltage oriented current, the power factor is improved.

Description

technical field [0001] The invention belongs to the application field of power electronics technology, and in particular relates to a method for eliminating the zero-crossing distortion of a VIENNA rectifier current. Background technique [0002] In recent years, three-level converters have received extensive attention. Compared with the traditional two-level converter, the three-level converter has the advantages of lower total harmonic distortion rate, lower device voltage stress and higher energy conversion efficiency. Among many three-level converters, VIENNA rectifiers are widely used in many medium-voltage and high-power applications such as wind turbines and electric vehicles due to their high power factor and simple control. [0003] The current zero-crossing distortion problem of VIENNA rectifier is mainly caused by the traditional control method working at the unit power factor of the grid side, that is, the grid voltage and the input current of the grid side are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M7/219H02M1/42H02M1/32
CPCH02M7/217H02M7/219H02M1/42H02M1/32Y02B70/10
Inventor 孙鑫祥
Owner JIANGSU XINTONG AUTO PARTS