Instantaneous power cut restaring method and apparatus for frequency change speed regulating system

A variable frequency speed regulation and restarting technology, which is applied to motor generators/starters, starters of single polyphase induction motors, starter components, etc., can solve the problems of low efficiency and long restart time, and achieve the The effect of short starting time, stable starting process and improving work efficiency

Inactive Publication Date: 2006-01-11
DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
View PDF0 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method and device for re-starting after a momentary power failure of the frequency conv

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
  • Instantaneous power cut restaring method and apparatus for frequency change speed regulating system
  • Instantaneous power cut restaring method and apparatus for frequency change speed regulating system
  • Instantaneous power cut restaring method and apparatus for frequency change speed regulating system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] In the inverter control system, set a system setting frequency value f through the man-machine interface 0 , and set the allowable instantaneous power failure time threshold t 1 , allowing constant frequency boost time threshold t 3 , allowing the minimum starting frequency f 1 , according to the load characteristics, f 1 The setting range is: 0Hz~motor rated frequency. When the considered motor is in a state of free rotation, the residual voltage drops rapidly, which may lead to the searched residual voltage frequency f 1 * Inaccurate, when setting the parameter t 1 When , the attenuation characteristics of the residual pressure should be considered to determine t 1 the size of.

[0043] After starting the frequency converter, make the system gradually accelerate to f 0 , enter the normal running state, and the control system saves the output frequency value of the inverter in real time.

[0044] When the high-voltage incoming line of the power supply system l...

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

This invention relates to a method and a system for restarting when a high voltage conversion velocity-regulation system is off instantly, which boosts the output voltage of a converter to a nominated V/F curve voltage value corresponding to its residual frequency in constant frequency, then accelerates it to the system frequency according to the normal start program.

Description

technical field [0001] The invention relates to frequency conversion speed regulation technology, in particular to a method and system for re-starting after momentary power failure of a high-voltage frequency conversion speed regulation system. Background technique [0002] High-voltage frequency converter is an important equipment for controlling and regulating the speed of electric motors in industry. The cascaded high-voltage inverter mainly includes: multi-stage phase-shifting transformer, IGBT inverter bridge, optical fiber waveform drive and protection circuit, main control computer, auxiliary computer, PLC for programmable control and adjudication of faults, and control interface circuit. Here, we may wish to collectively refer to the main control computer, auxiliary computer, PLC for programmable control and adjudication of faults, and control interface circuits as the control system of the frequency converter, and the IGBT inverter bridge, optical fiber waveform dri...

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): H02P1/30H02P1/04
Inventor 梁之龙崔杨彭良平赖成毅常瑞
Owner DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP 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

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