A low harmonic suppression method for four-quadrant converter device of electric locomotive

A technology of converter devices and electric locomotives, applied in the field of control, can solve problems such as power grid power quality pollution, influence of converter control, dynamic performance of four-quadrant control and influence of harmonic suppression ability, etc., to reduce pollution and interference, avoid The influence of electromagnetic interference and the effect of improving harmonic characteristics

Active Publication Date: 2021-06-22
CRRC YONGJI ELECTRIC CO LTD
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a harmonic suppression method integrated in the four-quadrant control algorithm, which solves the problem that the low-order harmonics of the current of the four-quadrant converter affect the control of the converter and pollute the power quality of the power grid, and at the same time It solves the problem of using the software filter method to filter out the influence of low-order harmonics, and also solves the problem of low calculation accuracy of the fundamental wave phase angle and low-order harmonic phase angle of the power grid network voltage signal, which causes the four-quadrant control dynamics Issues that have a certain impact on performance and harmonic rejection

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
  • A low harmonic suppression method for four-quadrant converter device of electric locomotive
  • A low harmonic suppression method for four-quadrant converter device of electric locomotive
  • A low harmonic suppression method for four-quadrant converter device of electric locomotive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] 1. The switching frequency of the four-quadrant rectifier is usually only a few hundred Hz. When the filter scheme is used for current harmonics, the control performance of the four-quadrant rectifier is easily affected by the filter. Therefore, the control closed-loop scheme is adopted for current harmonic suppression.

[0038] 2. The whole scheme is composed of four parts: four-quadrant control algorithm, four-quadrant modulation algorithm, main circuit topology and harmonic suppression algorithm. Among them, the four-quadrant control algorithm adopts dynamic decoupling control based on id_iq, and the four-quadrant modulation algorithm adopts unipolar frequency multiplication modulation. ; The harmonic suppression algorithm adopts the closed-loop control method of harmonic current DC flow based on PI controller, which is mainly composed of a harmonic current extraction module and a harmonic current suppression module.

[0039] 3. The control hardware adopts the hardwa...

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 belongs to the field of control, and in particular relates to a control algorithm for suppressing low-order current harmonics of a four-quadrant converter, specifically a method for suppressing low harmonics of a four-quadrant converter for an electric locomotive. The harmonic suppression method in the four-quadrant control algorithm solves the problem of the influence of the low-order harmonics of the four-quadrant converter current on the control of the converter and the pollution of the power quality of the grid, and at the same time solves the problem of using a software filter Filter out the problem of the impact of low-order harmonics, and also solve the problem of low calculation accuracy of the fundamental wave phase angle and low-order harmonic phase angle of the grid network voltage signal, which has a certain impact on the dynamic performance of the four-quadrant control and the ability to suppress harmonics. problem of impact. This method mainly adds harmonic extraction and suppression functions to the control algorithm of the four-quadrant converter, has high adaptability and flexibility, and can achieve high-precision harmonic suppression.

Description

technical field [0001] The invention belongs to the field of control, in particular to a control algorithm for suppressing low-order current harmonics of a four-quadrant converter, in particular to a method for suppressing low-order harmonics of a four-quadrant converter for electric locomotives. Background technique [0002] Four-quadrant rectifiers are widely used in electric locomotives because of their high power factor and the ability to realize bidirectional flow of energy. Due to the low switching frequency of the four-quadrant rectifier, its AC side current usually has poor harmonic characteristics, which brings harmonic pollution to the power supply network, thereby affecting the power quality of the power supply network and the grid environment when other locomotives are running. [0003] In practical applications, four-quadrant converters usually use various methods to reduce the pollution caused by current harmonics. The main circuit topology of four-quadrant con...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 于森林苏鹏程王力张巧娟詹哲军梁海刚司军民
Owner CRRC YONGJI ELECTRIC CO LTD
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