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A low common-mode voltage dual three-phase motor svpwm control method

A technology of common mode voltage and control method is applied in the control field of multi-phase motors, which can solve the problems of harmonics, common mode voltage, and irreconcilable utilization rate of bus voltage, so as to improve utilization rate of bus voltage and reduce low-order harmonics. , the effect of amplitude reduction

Active Publication Date: 2019-12-10
大连智鼎科技有限公司
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  • Application Information

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Problems solved by technology

Therefore, there are irreconcilable contradictions among harmonics, common mode voltage, and bus voltage utilization

Method used

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  • A low common-mode voltage dual three-phase motor svpwm control method
  • A low common-mode voltage dual three-phase motor svpwm control method
  • A low common-mode voltage dual three-phase motor svpwm control method

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Embodiment Construction

[0040] Hereinafter, with reference to the accompanying drawings, taking a double-three-phase permanent magnet synchronous motor as an example, the specific implementation manner of the present invention will be further described in detail. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0041] The power of the dual three-phase permanent magnet synchronous motor used in this embodiment is 28kw, and the DC bus voltage of the inverter is 300v. The method of this example is as follows.

[0042] Step 1: According to the fundamental wave and harmonic analysis of the dual three-phase motor, all the voltage vectors are divided into an αβ space containing electromechanical energy conversion and a z1z2, o1o2 space with only harmonics, respectively as figure 1 and figure 2 shown. According to the magnitude of the voltage vector, all vectors are divided into four groups: u max , u mid , u bas ,...

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Abstract

The invention provides a SVPWM control method for a dual-three-phase motor with low common-mode voltage, and relates to the technical field of multi-phase motor control. Based on the harmonic analysis of dual-three-phase motors, this method divides all voltage vectors into a space containing electromechanical energy conversion and a space with only harmonics, selects the combination of the main vector and the auxiliary vector, and calculates the main vector sum according to the traditional two-vector SVPWM method Zero vector action time, according to the volt-second balance principle, the obtained zero vector action time is allocated to the main vector and the auxiliary vector, and the assigned main vector action time is added to the main vector action time obtained by the traditional two-vector SVPWM method as The actual action time of the main vector, and the assigned auxiliary vector action time is used as the actual action time of the auxiliary vector. The invention solves the problem of reducing the common-mode voltage of the double-three-phase motors, and at the same time considers the harmonics in the z1z2 space, ensures higher busbar voltage utilization ratio, and reduces the harmonics to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of control of multi-phase motors, in particular to a SVPWM (Space Vector Pulse Width Modulation, Space Vector Pulse Width Modulation) control method for dual-three-phase motors with low common-mode voltage. Background technique [0002] In various fields of production and life, motors and their transmission systems are widely used, so they play an important role in the national economy. In recent years, the field of motor transmission has shown a trend of rapid development both in theory and practice, and people have higher requirements for the performance of motors. Multi-phase motors have small rotational pulsation, good fault tolerance, small harmonics, and are suitable for low-voltage and high-power occasions, and have received more and more research. [0003] In terms of control of multi-phase motors, DC power is usually used for power supply, and a series of pulse waves are input to the motor. Unlike...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P27/08H02P25/02H02P25/024H02M1/12
CPCH02M1/12H02P25/02H02P27/08H02P21/50H02P25/024H02M1/123
Inventor 张志锋吴雪松
Owner 大连智鼎科技有限公司