Method of restraining current oscillation of scalar frequency converter

A technology of current oscillation and frequency converter, which is applied in the direction of controlling generators, controlling electromechanical brakes, controlling electromechanical transmissions, etc., can solve the problems of low system robustness and poor control effect, and achieve high system robustness and control Good effect, the effect of suppressing current oscillation

Inactive Publication Date: 2010-03-03
BEIJING DONGBIAO ELECTRONICS
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Problems solved by technology

This method is only controlled by the magnitude of the current, and the magnitude

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  • Method of restraining current oscillation of scalar frequency converter
  • Method of restraining current oscillation of scalar frequency converter

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[0013] In order to better suppress the current oscillations of the scalar inverter during low-frequency light-load operation, the present invention provides a method for suppressing the current oscillations of the scalar inverter. The main idea is to decompose the current vector and directly affect the energy exchange. The active current component is processed to obtain the frequency correction, and then the output frequency is corrected to achieve the function of suppressing current oscillation.

[0014] See for details figure 1 As shown, including the following steps:

[0015] S1, decouple the active current component and the reactive current component of the three-phase current output from the inverter to the motor.

[0016] S2, the active current component is processed to obtain the frequency correction amount.

[0017] S3. Correct the original frequency with the frequency correction amount.

[0018] More specifically, see figure 2 As shown, the three-phase current output from the...

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Abstract

The invention discloses a method of restraining current oscillation of a scalar frequency converter and relates to the strong current detection field and the method is used to restrain the current oscillation appearing in the low frequency light running of the scalar frequency converter. The method comprises the following steps: A. decoupling the active component of current and reactive componentof current of the three phase current output to an electric machine from the frequency converter; B. treating the active component of current to obtain the correction quantity of frequency; and C. correcting the original frequency by using the correction quantity of frequency. The invention firstly decouples the active component of current and the reactive component of current, then treats the active component of current to obtain the correction quantity of frequency and finally uses the correction quantity of frequency to correct the original frequency. The circular correction is used for theoriginal frequency so as to achieve the effect of restraining the current oscillation of the scalar frequency converter. As the correction quantity of frequency is changed dynamically in the circularcorrection process and the correction quantity of frequency is not a scalar, the control effect of the invention is better than that of the prior art and the system robustness is higher.

Description

technical field [0001] The invention relates to the field of strong electric equipment, in particular to a method for suppressing current oscillation of a scalar frequency converter. Background technique [0002] When the scalar inverter is running at low frequency and light load, it is prone to current oscillation distortion and even system instability. The oscillation of the current will cause the system to trigger an alarm due to overcurrent, making the system unable to work stably and reliably. [0003] The commonly used treatment method is to form a negative feedback system through the current when the oscillation occurs, so as to achieve the purpose of suppressing the oscillation. This method is only controlled by the magnitude of the current, and the magnitude is a scalar, which makes the control effect poor and the system robustness is low. Contents of the invention [0004] The invention provides a method for suppressing the current oscillation of a scalar frequ...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 周继华杨凤山刘宏伟
Owner BEIJING DONGBIAO ELECTRONICS
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