Motor control system and noise reduction control method and device for frequency converter of motor control system

A technology of motor control and control method, which is applied in the direction of control system, motor control, AC motor control, etc., can solve problems such as frequency converter noise, and achieve the effects of suppressing noise, reducing and suppressing noise, and reducing harmonic amplitude

Inactive Publication Date: 2017-06-13
GUANGDONG MEIZHI COMPRESSOR
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But, the problem that related technology exists is, the carrier frequency of SVPWM wave is fixed (as figure 1 As shown, the carrier frequency ...

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  • Motor control system and noise reduction control method and device for frequency converter of motor control system
  • Motor control system and noise reduction control method and device for frequency converter of motor control system
  • Motor control system and noise reduction control method and device for frequency converter of motor control system

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Embodiment Construction

[0033]Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0034] The noise reduction control method and device of the motor control system and its frequency converter according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0035] figure 2 It is a flowchart of a noise reduction control method for a frequency converter in a motor control system according to an embodiment of the present invention. Wherein, the frequency converter outputs space vector pulse width modulation SVPWM (Space Vector Pulse Width Modulation, Spac...

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Abstract

The invention discloses a motor control system and a noise reduction control method and device for a frequency converter of the motor control system. The frequency converter outputs a space vector pulse width modulation (SVPWM) wave to a motor in the motor control system. The method comprises the following steps: acquiring a preset central carrier frequency, a preset frequency band constant and a preset random distribution function; acquiring a current frequency band constant according to the preset frequency band constant and the preset random distribution function, and acquiring a current carrier frequency according to the preset central carrier frequency and the current frequency band constant; generating an SVPWM wave of a current period according to the current carrier frequency, so as to reduce noise of the frequency converter. Therefore, random change of the carrier frequency of the SVPWM wave based on a certain rule can change a harmonic spectrum of voltage output by the frequency converter, so as to enable the harmonic spectrum to be distributed on a relatively wide frequency band; furthermore, under a condition of not changing total harmonic energy, a harmonic amplitude value can be reduced, so that the noise of the frequency converter is decreased and suppressed.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a noise reduction control method for a frequency converter in a motor control system, a noise reduction control device for a frequency converter in a motor control system, and a motor control system. Background technique [0002] In the related art, SVPWM is usually used as a driving algorithm of the variable frequency drive. But, the problem that related technology exists is, the carrier frequency of SVPWM wave is fixed (as figure 1 As shown, the carrier frequency is T), which causes the SVPWM wave to generate high-order harmonics near the carrier frequency and its integer multiples, causing the noise of the frequency converter. [0003] Therefore, related technologies need to be improved. Contents of the invention [0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the pre...

Claims

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Application Information

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IPC IPC(8): H02P29/50H02P27/08
CPCH02P27/08
Inventor 杜鑫龙
Owner GUANGDONG MEIZHI COMPRESSOR
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