Five-level specific harmonic elimination method for parallel current source converter

A specific harmonic elimination and converter technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of large switching loss and high switching frequency, and achieve current uniformity. flow, harmonic performance is not affected by the effect

Active Publication Date: 2018-11-06
TIANJIN UNIV +1
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the improved space vector modulation method can realize the current sharing of ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Five-level specific harmonic elimination method for parallel current source converter
  • Five-level specific harmonic elimination method for parallel current source converter
  • Five-level specific harmonic elimination method for parallel current source converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The specific implementation of the five-level specific harmonic elimination method for parallel current source converters of the present invention will be described below with reference to the accompanying drawings, so that those skilled in the art can better understand the present invention.

[0043] Taking parallel current source rectifiers as an example, figure 1 It is a circuit diagram of a specific embodiment of the present invention. Such as figure 1 As shown, the parallel current source rectifier adopts two parallel three-phase full-bridge topology as the rectifier circuit, and each full bridge consists of six power switch tubes, in this embodiment, it is an IGBT (Insulated Gate Bipolar Transistor) with a reverse diode , insulated gate bipolar transistor), two rectifier bridges share the AC and DC bus.

[0044] The present invention is used for the five-level specific harmonic elimination method of parallel current source rectifier, and its basic steps are as f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a five-level specific harmonic elimination method for a parallel current source converter. Common-mode voltage of the converter can be reduced at a relatively low switching frequency, current sharing of DC bridge arms is achieved and the AC harmonic characteristics are ensured. The five-level specific harmonic elimination method comprises the steps of (1) determining 19 PWMcurrent and corresponding switching states of the parallel current source converter according to switching constraint conditions of the current source converter and dividing the PWM current into large, medium, small and zero four classes according to the magnitudes of the PWM current; (2) analyzing common-mode voltage corresponding to each PWM current and selecting the PWM current with relativelylow common-mode voltage for modulation; (3) analyzing the influences of redundant switching states of the PWM current for modulation on current sharing of the DC bridge arms; (4) building a five-level modulation waveform by using the PWM current participating into modulation; and (5) outputting a drive signal according to the modulation waveform in the step (4) and the switching states determinedin the step (3).

Description

technical field [0001] The invention relates to a specific harmonic modulation method for parallel current source converters, in particular to a method for ensuring the harmonic characteristics of alternating current at lower switching frequencies, reducing the common-mode voltage of parallel current source converters and realizing direct current Modulation method of bridge arm current sharing. Background technique [0002] Converter technology is a technology that converts electrical energy from DC to AC or AC to DC, and plays an important role in today's industrial applications. Current source converters are widely used. The principle is to use switching tubes to build the main circuit, and then use corresponding modulation methods to control the switching state of the switching tubes, so that the input / output current waveforms are approximately sinusoidal. The principle of the specific harmonic elimination method is to construct the modulation waveform according to the c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02M1/12H02M7/483
CPCH02M1/12H02M7/483H02M1/123
Inventor 何晋伟李强吕渊张昌浩李渝孙谊媊
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap