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Control algorithm for improving V/F output current fluctuation

A control algorithm and output current technology, applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve the problems of affecting the load capacity of the inverter and damaging the power device, etc., to achieve good promotion value and reduce output The effect of current fluctuation and guaranteed load capacity

Active Publication Date: 2015-10-14
TAIAN TECH WUXI
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  • Claims
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Problems solved by technology

When the oscillating current reaches a certain value, it will cause the protection action of the inverter, which will affect the load capacity of the inverter, and may even damage the power device.

Method used

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  • Control algorithm for improving V/F output current fluctuation
  • Control algorithm for improving V/F output current fluctuation
  • Control algorithm for improving V/F output current fluctuation

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Embodiment Construction

[0035] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] The control algorithm for improving V / F output current fluctuation provided by the invention is mainly applicable to induction motors. By collecting the three-phase current of the motor, the three-phase current is converted to the synchronous rotation coordinate axis of the stator by using the park transformation, and the active current iq is obtained; after the active current iq is high-pass filtered, multiplied by the gain value, and then subjected to limiting processing, the compensation is obtained The voltage is added to the V / F curve voltage to get the final voltage command. Specific steps are as follows.

[0037] step one:

[0038] Collect the three-phase current of the induction motor, and use the park transformation to convert the three-phase current to the synchronous rotation coordinate axis of the stator (such as figure...

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Abstract

The present invention discloses a control algorithm for effectively improving V / F output current fluctuation, and the control algorithm is mainly used in an induction motor. Through collecting motor three-phase current, the three-phase current is converted to a stator synchronous rotation coordination axis by using park conversion, and active current is obtained. The active current is subjected to high-pass filtering and then is multiplied by a gain value to be subjected to amplitude limiting processing, compensation voltage is obtained, and the compensation voltage and V / F curve voltage are added to obtain a final voltage command. According to the control algorithm, the V / F output current fluctuation can be significantly reduced, the motor operation stability and torque stability are ensured, the load capacity of an inverter is ensured, and the damage of a power device is avoided.

Description

technical field [0001] The invention belongs to the technical field of motor frequency conversion and speed regulation, and in particular relates to a control algorithm for improving V / F output current fluctuations. Background technique [0002] When the asynchronous motor is running with frequency conversion and speed regulation, the speed may be unstable in a certain frequency range and the load changes, and the system output current will fluctuate at this time. This fluctuation affects the running smoothness and torque stability of the motor. When the oscillating current reaches a certain value, it will cause the protection action of the inverter, which will affect the load capacity of the inverter, and may even damage the power device. Contents of the invention [0003] In view of the above problems, the present invention proposes a control algorithm for improving V / F output current fluctuations. [0004] Technical scheme of the present invention is as follows: [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/12
Inventor 任梦蕊刘林
Owner TAIAN TECH WUXI
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