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A voltage modulation method and device

A technology of voltage modulation and modulation method, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of affecting the response speed of the motor system, complex operation, multi-resources, etc., to avoid harmonics, implement simple, suppress The effect of increased motor loss

Active Publication Date: 2021-04-16
WEICHAI POWER CO LTD
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  • Application Information

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Problems solved by technology

[0007] In view of this, the present application provides a voltage modulation method and device to solve the problem that the operation of the voltage over-modulation method in the prior art is complicated, which leads to the occupation of too many resources and affects the response speed of the motor system

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Embodiment Construction

[0044] Aiming at the problem that the operation of the voltage over-modulation method in the prior art is complicated, which leads to occupying too many resources and affects the response speed of the motor system, after determining that the SVPWM is in the over-modulation area, the application adopts the method of keeping the phase angle of the reference voltage constant. Under the changing conditions, the amplitude of the reference voltage is corrected so that the reference voltage vector is located in the hexagonal coverage area of ​​the voltage space vector plane, and the corrected three-phase modulation wave is obtained, and then the space vector pulse is performed on the corrected three-phase modulation wave wide modulation. It is realized that the space vector pulse width modulation can be performed on the corrected three-phase modulation wave through one correction of the reference voltage amplitude, and the modulation realization method is simple.

[0045] The followi...

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Abstract

This application discloses a voltage modulation method and device. After determining that the SVPWM is in the over-modulation region, the voltage modulation method adopts the method of correcting the amplitude of the reference voltage under the condition of keeping the phase angle of the reference voltage unchanged, so that the reference voltage vector Located in the hexagonal coverage area of ​​the voltage space vector plane, the corrected three-phase modulated wave is obtained, and then the space vector pulse width modulation is performed on the corrected three-phase modulated wave. Since only one correction is made to the reference voltage amplitude, the modulation implementation is simple. Moreover, the modified reference voltage vectors are located in the hexagonal coverage area of ​​the voltage space vector plane, and the phase angle of the reference voltage in the hexagonal coverage area of ​​the voltage space vector plane changes linearly, so the phase angle of the reference voltage will not A sudden change occurs, thereby avoiding the harmonics caused by voltage distortion, effectively suppressing the problem of increased motor loss caused by voltage harmonics, thereby improving the power performance of the vehicle at high speed.

Description

technical field [0001] The present application relates to the technical field of motor control, in particular to a voltage modulation method and device. Background technique [0002] Pulse Width Modulation PWM (Pulse Width Modulation) is an important part of the motor control system. Its function is to modulate the width of the pulse signal that controls the on-off of the main circuit power semiconductor device according to the input reference voltage vector and the current DC bus voltage, so that The fundamental wave voltage output by the main circuit is equal to the input reference voltage vector. Space Vector Pulse Width Modulation SVPWM (Space Vector Pulse Width Modulation) is a PWM method based on the principle of motor flux trajectory tracking. [0003] According to different modulation degrees, SVPWM is divided into linear modulation and over modulation. If the reference voltage vector is located within the inscribed circle of the voltage space vector plane hexagon, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/12
CPCH02P27/12
Inventor 高乐徐亚美张磊李军营高文进王敬
Owner WEICHAI POWER CO LTD
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