Phase voltage difference value type SVPWM control method for asynchronous motor

A technology of asynchronous motor and control method, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of large amount of calculation and cannot be overcome, and achieve the effect of improving the accuracy of output voltage

Inactive Publication Date: 2009-08-26
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

Although the relevant simplified algorithms are constantly being introduced, they still cannot overcome t

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  • Phase voltage difference value type SVPWM control method for asynchronous motor
  • Phase voltage difference value type SVPWM control method for asynchronous motor
  • Phase voltage difference value type SVPWM control method for asynchronous motor

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Embodiment Construction

[0024] The purpose and effects of the present invention will become more apparent by referring to the accompanying drawings in detail of the present invention.

[0025] The core of the present invention is: two adjacent basic voltage space vectors V in the same sector under the two-dimensional static coordinate system k , V k+1 The action time T k , T k+1 , is directly based on the three phase voltage difference variables of the asynchronous motor (V a -V b ), (V a -V c ), (V c -V b ), which does not involve coordinate matrix transformation and trigonometric function calculation. The present invention takes the first sector as an example, see Table 1. Table 1: Judgment list of voltage space vector Vref action sectors

[0026]

[0027] V in the first sector a >V b >V c , then the specific implementation of the difference SVPWM is as follows: T k , T k+1 Calculation formula (2) carries out:

[0028] T ...

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Abstract

The invention discloses a phase voltage difference value type SVPWM control method for asynchronous motor, comprising: in each PWM control period, the basic voltage space vector function time is directly calculated by using the phase voltage difference value of the three-phase sine reference voltage with the phase difference of 120 DEG generated by the control system, the sector position placed by the round rotating reference voltage vector v[ref] is judged according to the three reference phase voltage sequence relation arranged from the big to the small, the coordinate torque transfer, the trigonometric function operation and the vector resolving derivation of the reference voltage vector to the sector in the traditional method are eliminated, all the intermediate process is simplified, and only the size sequence of the three phase voltages is judged and the difference value is calculated, the step is clear, the model is simple, the calculating efficiency is high, the real-time is strong, the method is suitable for the high accuracy control and has theory innovation and practical value.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control of asynchronous motors, in particular to a phase voltage difference type SVPWM control method for asynchronous motors that can improve real-time control efficiency. Background technique [0002] Voltage space vector pulse width modulation (SVPWM) technology has been widely used in asynchronous motor AC variable frequency speed regulation system due to its characteristics of less switching times, high voltage utilization rate and good harmonic suppression effect. However, the traditional SVPWM control method first needs to introduce the Park coordinate transformation, and the V in the three-phase rotating coordinate system a , V b , V c The phase voltage is mapped to the voltage space vector component in the two-dimensional static coordinate system, and the sector is divided by calculating the phase angle θ through the arc tangent, and the basic voltage space vector action ti...

Claims

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Application Information

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IPC IPC(8): H02P27/06H02P21/00
CPCY02P80/10
Inventor 张寅孩祝苇
Owner ZHEJIANG SCI-TECH UNIV
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