Current tracking control method

A control method and current tracking technology, applied in the field of control, can solve the problems of complex control method, low power factor of hybrid rectifier, low power factor, etc.

Inactive Publication Date: 2015-06-10
BEIJING INFORMATION SCI & TECH UNIV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current tracking control methods of the above-mentioned hybrid rectifier mainly include linear control method, hysteresis comparison method, etc. These control methods are relatively complicated, and the control accuracy is low, the switching frequency is not constant, and the switching loss a

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
  • Current tracking control method
  • Current tracking control method
  • Current tracking control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] In order to make the purpose, 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 specific embodiments.

[0022] figure 2 It is a flow chart of the current tracking control method of the present invention. Such as figure 1 As shown, the current tracking control method of the present invention, for a hybrid rectifier including a three-level PWM boost rectifier, includes the following steps:

[0023] Step 1, obtaining the three-phase given current of the hybrid rectifier and the collected three-phase input real-time current i n deviation Wherein, the phase sequence of the three-phase input of the hybrid rectifier is a, b, c, S a , S b , S c For the hybrid rectifier three-phase switch, the three-phase given current and three-phase input real-time current i n Corresponding; a, b, c are all parameters, and n=a, b, c.

[0024] In 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 provides a current tracking control method. For a hybrid rectifier including a three-level PWM boost rectifier, the current tracking control method comprises the steps of obtaining three-phase given current, acquiring three-phase input real-time current of the hybrid rectifier, sorting three-phase input phase sequences of the hybrid rectifier according to three-phase set duty ratio from small to big, obtaining the breakover time Tx, Ty and Tz of a three-phase switch in a working period according to a circuit structure of the hybrid rectifier, judging whether 0<Tx<Ts/2, 0<Ty<Ts/2 or 0<Tz<Ts/2 is established or not; correcting the Tx, Ty or Tz; obtaining the three-phase duty ratio of the three-phase switch; respectively performing breakover or turnoff of the corresponding three-phase control switch according to the three-phase duty ratio after pulse width modulation so as to achieve current tracking. The current tracking control method has the advantages of being high power factor, low in harmonic distortion rate and the like and can be widely applied to the field of current tracking control.

Description

technical field [0001] The invention relates to control technology, in particular to a current tracking control method. Background technique [0002] In order to adapt to the development of social needs and scientific and technological progress, rectifiers, which are common electrical devices in civil and industrial fields, are also continuously improved. In recent years, foreign scholars have proposed a hybrid rectifier composed of different types of rectifiers connected in series or parallel. For example, a three-level PWM boost rectifier and a single-switch three-phase boost rectifier are connected in series or in parallel to form a three-phase three-level hybrid rectifier. ; Wherein, the three-level PWM boost rectifier is used in the three-phase three-level rectifier to compensate the current waveform of the single-switch three-phase boost rectifier, and forms a sinusoidal current synchronous with the grid voltage on the AC grid side. figure 1 It is a schematic diagram ...

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): H02M7/217
CPCH02M7/217
Inventor 李萍王久和
Owner BEIJING INFORMATION SCI & TECH 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