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Control device for improving output voltage distortion degree of frequency converter

A technology of output voltage and control device, applied in the direction of output power conversion device, motor control, control system, etc., can solve problems such as the influence of the drive motor, the inability to measure the distortion of the output voltage of the inverter, and the decline of the filtering effect.

Pending Publication Date: 2021-02-19
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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Problems solved by technology

Because the filter is designed for a fixed frequency, the filtering effect will be greatly reduced in other frequency bands, especially at the frequency of 50Hz to 100Hz, due to the mismatch of filter parameters, the filter has lost its function, and the inverter output The voltage distortion can no longer be measured by measuring instruments due to excessive high-order harmonics, which will have a very adverse effect on the drive motor

Method used

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  • Control device for improving output voltage distortion degree of frequency converter

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Embodiment Construction

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the control device for improving the output voltage distortion of the frequency converter of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Such as figure 1 As shown, a control device for improving the distortion degree of the output voltage of the frequency converter includes a low-pass filter 3 arranged between the output terminal 1 of the frequency converter and the load 2, and a low-pass filter 3 arranged between the low-pass filter 3 and the load 2 The control filter mechanism 4, the control filter mechanism 4 includes a PLC controller, a contactor K1 and capacitors U4~U6; the contactor K1 is electrically connected to the PLC controller, and the capacitors U4~U6 are respectively connected to the contactor K1; one end of the capacit...

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Abstract

The invention discloses a control device for improving the output voltage distortion degree of a frequency converter. The device comprises a low-pass filter disposed between the output end of the frequency converter and a load, and also comprises a control filtering mechanism disposed between the low-pass filter and the load, wherein the control filtering mechanism comprises a PLC, a contactor K1,and capacitors U4-U6, wherein the contactor K1 is electrically connected with the PLC, and the capacitors U4-U6 are respectively connected with the contactor K1. By judging the output frequency of the frequency converter and controlling the switching-on and switching-off of the filter capacitors on line, filtering parameters are dynamically adjusted, the output voltage distortion degree of the frequency converter at the frequency of 50 Hz to 100 Hz is improved, higher harmonics of the frequency band are eliminated, and then the filtering effect is improved.

Description

technical field [0001] The invention belongs to the field of frequency converter control, and in particular relates to a control device for improving the distortion degree of the frequency converter output voltage. Background technique [0002] As the drive device of the motor, the frequency converter has a great influence on the quality of the driving waveform. If the driving waveform contains a large number of harmonics, the long-term operation of the frequency converter will increase the heat generation of the motor, causing insulation aging and affecting the performance of the motor. service life. The filter of the current frequency converter is only designed for the fixed frequency. Under the fixed frequency, the high-order harmonics in the output waveform of the frequency converter can be effectively filtered out, so that the distortion degree of the output voltage of the frequency converter meets the requirements of the motor. Because the filter is designed for a fix...

Claims

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Application Information

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IPC IPC(8): H02P29/50H02M1/12
CPCH02P29/50H02M1/126
Inventor 宋涛李玉宾赵秋毅刘帅丰潇晗
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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