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Voltage modulation method and device

A voltage modulation and modulation method technology, applied in the direction of AC motor control, electrical components, control systems, etc., can solve the problems of affecting the response speed of the motor system, complex operation, multiple resources, etc., to avoid harmonics, simple implementation, and suppression Effect of increased motor losses

Active Publication Date: 2019-11-08
WEICHAI POWER CO LTD
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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

The invention discloses a voltage modulation method and device. The voltage modulation method comprises the following steps: determining that SVPWM is in an overmodulation region; under the conditionthat a phase angle of the reference voltage is kept unchanged, correcting the amplitude of the reference voltage, so that a reference voltage vector is located in a hexagonal coverage area of a voltage space vector plane; obtaining a corrected three-phase modulation wave, and then carrying out space vector pulse width modulation on the corrected three-phase modulation wave. Since only the reference voltage amplitude is corrected once, the modulation implementation mode is simple. Moreover, the corrected reference voltage vectors are all located in the hexagonal coverage area of the voltage space vector plane. The phase angle of the reference voltage in the hexagonal coverage area of the voltage space vector plane is linearly changed; therefore, the phase angle of the reference voltage doesnot change suddenly, harmonic waves generated by voltage distortion are avoided, the problem that motor loss is increased due to the voltage harmonic waves is effectively solved, and the power performance of the whole vehicle in a high-speed running state is improved.

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 Applications(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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