Power-off synchronous operation method and system for frequency converter

A technology of synchronous operation and frequency converter, applied in the control system, electrical components, AC motor control, etc., can solve the problems of machine undervoltage or overvoltage, poor applicability, complicated debugging, etc., and achieve the effect of ensuring synchronization and easy debugging

Active Publication Date: 2016-07-13
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology

[0004] The method of setting the same deceleration time is too complicated to debug, because the deceleration time parameter is too large or too small to make the machine undervoltage or overvoltage, and it needs co

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  • Power-off synchronous operation method and system for frequency converter
  • Power-off synchronous operation method and system for frequency converter

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[0048] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] reference figure 1 , Is a schematic diagram of the bus voltage generated by the power-off synchronous operation method of the frequency converter of the present invention after the bus is cut off and the change of the motor operating frequency with time;

[0050] As shown in the figure, in the initial stage, the voltage supply is normal, and the bus voltage has been at a stable voltage. At a certain moment t1 is suddenly cut off, the bus voltage drops. In order to maintain the bus voltage at a target level, the present invention is based on the principle that the motor can generate electricity when the motor decelerates quickly. The deceleration speed of the motor is changed in real time through the power-off synchronization ...

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Abstract

The invention relates to a power-off synchronous operation method and system for a frequency converter. The method includes the steps of: S1. monitoring bus voltage in real time by a host frequency converter, and entering Step S2 when the bus voltage is smaller than a preset power-off synchronization value V<llimit>; S2. detecting real-time voltage V of a bus, and calculating actual deceleration time T* according to the real-time voltage V and a preset target voltage V<target>; S3. adjusting the operating frequency of the host frequency converter according to current operating frequency and the actual deceleration time T* calculated in S2, so that the bus voltage is stabilized at the preset target voltage V<target>; and S4. when the operating frequency of the host frequency converter is larger than zero, outputting the operating frequency to slave frequency converters which control operating frequency of themselves to be synchronous with the received operating frequency, and skipping to the Step S2. According to the power-off synchronous operation method, after power-off, the bus voltage is automatically increased and is maintained at the target voltage V<target> in real time, thereby guaranteeing normal operation of a motor, systems with various load inertia are automatically adapted to, and synchronization of slaves is guaranteed.

Description

technical field [0001] The invention relates to the field of textile motors, in particular to a power-off synchronous operation method and system for frequency converters. Background technique [0002] Since most of the motor drives in the textile industry have different load inertias, in the event of an unexpected power failure, the parking time for each machine to free run after undervoltage is inconsistent. This out-of-synchronization can cause problems such as breakage or deformation of the yarn or cloth. [0003] In the textile industry, power-off synchronization is the most demanding synchronous operation method. At present, the industry mostly adopts the parking method that allows each machine to run for the same deceleration time after power-off, so as to achieve synchronous stop after power-off. [0004] The method of setting the same deceleration time is too complicated to debug, because the deceleration time parameter is too large or too small to make the machine...

Claims

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Application Information

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IPC IPC(8): H02P27/04
CPCH02P27/04
Inventor 郝亮
Owner SUZHOU INOVANCE TECH CO LTD
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