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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 multi-phase induction motors, starter components, etc., can solve the problems of long restart time and low efficiency, and achieve the The effect of short start-up time, improved work efficiency and smooth start-up process

Inactive Publication Date: 2008-08-13
DONGFANG HITACHI CHENGDU ELECTRICAL CONTROL EQUIP CO LTD
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  • Abstract
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  • Claims
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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 converter with a stable starting process, a short starting time and high efficiency in view of the shortcomings of the prior art, such as long restart time and low efficiency.

Method used

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  • 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

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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...

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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

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Application Information

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Patent Type & Authority Patents(China)
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
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