A control method for restarting the motor after a high-voltage inverter loses power

A high-voltage frequency converter and control method technology, applied in the direction of motor generator/starter, single multi-phase induction motor starter, etc., can solve the problems of large measurement data, difficult industrial field application, complex calculation, etc., and achieve the physical concept Clear, less data collection, simple operation effect

Inactive Publication Date: 2015-10-21
HUBEI SANHUAN DEV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is inconvenient to install a speed sensor on the high-voltage and large-capacity motor shaft, this method is of little significance in engineering applications
There are also some measurement methods that are cumbersome in theory, have a lot of measurement data, complex calculations, and low accuracy, which are difficult to apply in industrial sites

Method used

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  • A control method for restarting the motor after a high-voltage inverter loses power
  • A control method for restarting the motor after a high-voltage inverter loses power
  • A control method for restarting the motor after a high-voltage inverter loses power

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Embodiment

[0039] A control method for electrical restarting of a high-voltage frequency converter after a power failure, characterized in that it comprises the following steps:

[0040] Step 1. When the motor is restarted after the inverter is powered off and restored, set the initial search frequency f of the inverter output 0 is the rated frequency f of the inverter N ,

[0041] Step 2. Set the output voltage of the inverter as u 0 , Among them, u N is the rated voltage of the motor;

[0042] Step 3. Take the zero-crossing moment when the phase a voltage changes from negative to positive as the starting moment, and measure the three-phase voltages as u a , u b and u c ;Measure phase a current as i a , measure b-phase current as i b ;

[0043] u a = u m sin(ωt)

[0044] u b = u m sin ( ωt - 2 π...

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Abstract

The invention discloses a control method for restarting a high-voltage high-capacity frequency control asynchronous motor after power loss. The method is based on a mathematical model of an asynchronous motor, an instantaneous reative power is used, the motor speed can be safely and reliably identified when a high-voltage inverter is powered up again after power loss, therefore the normal operation of a variable-frequency speed control system is recovered quickly, safety hazards formed by long-time halt are eliminated, and possible economic losses are avoided.

Description

technical field [0001] The invention belongs to the field of electric technology, and more specifically relates to a control method for restarting a motor after a high-voltage frequency converter loses power, which is suitable for controlling the restart of a motor after a high-voltage frequency converter loses power. Background technique [0002] At present, in many fields of engineering, high-voltage and large-capacity variable-frequency speed-regulating asynchronous motors are generally used to drive various loads to meet the needs of production technology or energy saving. When the power grid fails and trips, the inverter loses power, the control system will block the output of the inverter, and the motor will lose control and be in a state of decelerating rotation. In some production processes, if the motor cannot resume normal operation in time, serious safety accidents and economic losses may occur. For this reason, after the inverter loses power instantaneously and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/26
Inventor 王宏英毕平劲蒋绍涛梅震龚世缨
Owner HUBEI SANHUAN DEV
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