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Space vector pulse width modulation method and device

A technology of space vector pulse width and modulation equipment, which is applied in the direction of control system, motor control, AC motor control, etc., and can solve the problem that it cannot be close to the sine wave well

Active Publication Date: 2017-05-31
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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Problems solved by technology

[0005] However, the above two methods are directly calculated according to the three-phase sine wave voltage currently output by the inverter to obtain the comparison value, and the comparison values ​​of the first half cycle of the sine wave and the second half cycle of the sine wave are equal, that is, in a cycle of a three-phase sine wave Calculate the comparison value once, so the output waveform is not very close to the sine wave

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  • Space vector pulse width modulation method and device

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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] See figure 1 On the one hand, the present invention provides a space vector pulse width modulation method, which includes step S10 and step S12:

[0029] S10, acquiring the triangular wave signal, the three-phase voltage signal to be modulated and the current rotor angle of the motor.

[0030] That is, at the current moment, the triangular wave signal that has been modulated in advance, the three-phase voltage signal to be modulated that is input into ...

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Abstract

The invention discloses a space vector pulse width modulation method. The method comprises the following steps of obtaining a triangular wave signal, a three-phase voltage signal to be modulated, and a current rotor angle of a motor; generating a corresponding first comparison value based on the current rotor angle of the motor and the respective current amplitude of the three-phase voltage signal when the triangular wave signal is detected to travel from the trough to the crest, and based on the first comparison value and the current amplitude of a triangular wave, obtaining a corresponding current level; and when the triangular wave signal is detected to travel from the crest to the trough, generating a corresponding second comparison value according to the current rotor angle of the motor and the respective current amplitude of the three-phase voltage signal, and according to the second comparison value and the current amplitude of the triangular wave, obtaining a corresponding current level, wherein the first comparison value is different from the second comparison value. The invention also discloses a space vector pulse width modulation device. The method and the device can modulate and output pulse width modulation waves effectively approaching sine waves.

Description

technical field [0001] The invention relates to the technical field of signal modulation, in particular to a space vector pulse width modulation method and equipment. Background technique [0002] Space Vector Pulse Width Modulation (SVPWM) is a relatively new control method developed in recent years. It is a pulse width modulation generated by a specific switching mode composed of six power switching elements of a three-phase power inverter. Wave, which can make the output pulse width modulation wave as close as possible to the ideal sine wave. SVPWM is different from the traditional sinusoidal pulse width modulation (Sinusoidal Pulse Width Modulation, SPWM). It starts from the overall effect of the three-phase output voltage and focuses on how to make the motor obtain an ideal circular flux trajectory. Compared with SPWM, SVPWM technology has a smaller harmonic component of the winding current waveform, which reduces the torque ripple of the motor, makes the rotating magn...

Claims

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Application Information

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IPC IPC(8): H02P27/12
CPCH02P27/085H02P27/12H02P2209/11
Inventor 李云欢
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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