Unlock instant, AI-driven research and patent intelligence for your innovation.

Pre-charging control method and system of frequency converter

A control method and pre-charging technology, applied in electrical components, manufacturing converters, high-efficiency power electronic conversion, etc., can solve the problems of inverter loss failure rate and shorten the service life of inverters

Active Publication Date: 2020-04-28
SHOUGANG JINGTANG IRON & STEEL CO LTD
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a rectification control method and system of a frequency converter, which is used to solve the problem that the rectification and precharging of the frequency converter is not completed when the frequency converter is used to control the oxygen lance in the prior art. The phenomenon that the oxygen gun starts to be operated at the time of operation will lead to an increase in the loss and failure rate of the frequency converter and reduce the service life of the frequency converter

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
  • Pre-charging control method and system of frequency converter
  • Pre-charging control method and system of frequency converter
  • Pre-charging control method and system of frequency converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a pre-charging control method for a frequency converter, such as figure 1 As shown, the methods include:

[0039] S110. When the target oxygen lance moves from the standby position to the working position, collect the backup position limit signal of the target oxygen lance, and acquire the target oxygen lance when the backup position limit signal is not consistent with the first reference signal. The first movement time of the oxygen gun;

[0040] Generally speaking, in order to prevent the oxygen lance from blowing oxygen in the converter for a long time and cause the oxygen lance to be covered by slag and damage the oxygen lance, each steelmaking converter is equipped with two sets of oxygen lances, and each set of oxygen lances is also equipped with a set of oxygen lance lifting devices , The oxygen lance lifting device is controlled by the corresponding frequency converter, and then controls the oxygen lance lifting. refer to figure 2 , ...

Embodiment 2

[0063] This embodiment provides a pre-charging control device for an inverter, refer to image 3 , the device includes: an acquisition unit 31 and a control unit 32; wherein,

[0064] Generally speaking, in order to prevent the oxygen lance from blowing oxygen in the converter for a long time and cause the oxygen lance to be covered by slag and damage the oxygen lance, each steelmaking converter is equipped with two sets of oxygen lances, and each set of oxygen lances is also equipped with a set of oxygen lance lifting devices , The oxygen lance lifting device is controlled by the corresponding frequency converter, and then controls the oxygen lance lifting. refer to figure 2 , when the first oxygen lance is in the working position, then the second oxygen lance is in the standby position; similarly, when the second oxygen lance is finished and the next batch of molten steel is smelted, the corresponding oxygen lance needs to be moved horizontally The equipment exchanges 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 pre-charging control method and device of a frequency converter. The method comprises the steps of collecting a standby position limiting signal of a target oxygen lance whenthe target oxygen lance moves from a standby position to a working position, and obtaining the first movement duration of the target oxygen lance when the standby position limiting signal is not consistent with a first reference signal; controlling a pre-charging contactor corresponding to the target frequency converter to be powered on when the first movement duration reaches a preset operation duration, wherein the pre-charging contactor is used for pre-charging a DC bus capacitor of the target frequency converter, the target frequency converter is used for controlling the lifting movement of the target oxygen lance, the preset operation duration is less than the total duration 2-4s of the target oxygen lance moving from the standby position to the working position, so that the target frequency converter is pre-charged when the target oxygen lance reaches the working position, and the frequency converter is used for lifting the oxygen lance, so that the loss of the frequency converter is avoided, the failure rate of the frequency converter is reduced, and the service life of the frequency converter is prolonged.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a pre-charging control method and system for a frequency converter. Background technique [0002] In the field of converter steelmaking, the oxygen lance lifting device of the steelmaking converter is controlled by a frequency converter. Before the frequency converter drives the motor to lift the oxygen lance, it is necessary to precharge the DC bus capacitor by closing the rectifier part. After the main incoming line contactor is closed, the oxygen lance can be raised and lowered. [0003] However, in the actual control process of the oxygen lance, there will be a phenomenon that the oxygen lance will be operated before the rectification and pre-charging of the inverter of the oxygen lance at the working position is completed, which will lead to an increase in the loss and failure rate of the inverter, and a decrease in the service life of the inverter. Contents ...

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): H02M1/00H02M1/32C21C5/46
CPCC21C5/462H02M1/00H02M1/32Y02B70/10
Inventor 王景娟吕永学张丙龙曾卫民王和兵吴耀春王胜秦登平赵长亮孟志铎张坤
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD