Mixed SVPWM control method used for three-phase grid-connected inverter

A control method and hybrid technology, which are applied in the parallel feeding arrangement of single grid, the conversion device of output power, the conversion of AC power input to DC power output, etc. Reduced conversion efficiency, multi-harmonic content, etc.

Inactive Publication Date: 2012-06-27
XIAN UNIV OF TECH
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the SVPWM method is widely used, and this method needs to complete two switching switchings for each power device in each switching cycle (defining that the power device is switched from on to off, or from off to on, which is 1 Each switching of the power device will cause a certain power loss
When the switching frequency is low, the switching loss of the power device can be ignored, but the low switching frequency will cause the three-phase voltage or c...

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
  • Mixed SVPWM control method used for three-phase grid-connected inverter
  • Mixed SVPWM control method used for three-phase grid-connected inverter
  • Mixed SVPWM control method used for three-phase grid-connected inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] Such as figure 1 Shown is the hardware circuit foundation that the method of the present invention is based on. Power electronic devices convert solar cells, wind turbines, etc. into DC voltage7. The first power switch tube 1 is used as the upper tube and the second power switch tube 2 is used as the lower tube to form the first bridge arm, which is called the A-phase bridge arm; the third power switch tube 3 is used as the upper tube and the fourth power switch tube 4 The second bridge arm is formed as the lower tube, which is called the B-phase bridge arm; the fifth power switch tube 5 is used as the upper tube and the sixth power switch tube 6 is used as the lower tube to form the third bridge arm, which is called the C-phase bridge arm. The positive pole of the DC voltage 7 is connected to one end of the first power switch tube 1, the third power switch tube 3 and the fifth power switch tube 5 respectively; the negative pole of the DC voltage 7 is connected to the...

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 mixed SVPWM control method used for a three-phase grid-connected inverter. Based on a three-phase PWM wave controller, control is carried out according to the following three-phase PWM wave: in an alpha beta voltage vector distribution coordinate system, dividing twelve 30-degree sectors, and naming each sector with a number sequentially; defining first, fourth, fifth, eighth, ninth and twelfth sectors as a three-section type modulation sector, and commanding that a reference vector Vref which generates the three-phase PWM wave is synthesized by two basic vectors in the above six sectors; defining second, third, sixth, seventh, tenth and eleventh sectors as a five-section type modulation sector, and commanding that the reference vector Vref which generates the three-phase PWM wave is synthesized by three basic vectors in the above six sectors. According to the invention, without increasing hardware cost, through controlling a pulse width generating mode, power device switching loss can be decreased by 50% based on a present SVPWM control method.

Description

technical field [0001] The invention belongs to the technical field of grid-connected power generation of distributed renewable new energy such as solar energy and wind energy, and specifically relates to a hybrid SVPWM control method for a three-phase grid-connected inverter. Background technique [0002] With the continuous reduction of fossil energy and the severe situation of global warming caused by the use of fossil energy, renewable natural energy such as solar energy and wind energy, which are environmentally friendly and abundant, are more and more popular among people. These renewable new energy sources are converted into direct current through appropriate media (such as solar cells, wind generators, etc.), and then converted into alternating current through a three-phase grid-connected inverter and sent to the three-phase public grid to complete new energy (solar, wind, etc.) Wind energy, etc.) to AC power energy conversion. How to maximize the conversion efficie...

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): H02M7/527H02J3/38
Inventor 孙向东安少亮任碧莹钟彦儒
Owner XIAN UNIV OF TECH
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