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Method and system for determining sector and duty cycle of three-phase alternating current motor SVPWM control

A technology of three-phase AC and duty cycle, which is applied in the direction of AC motor control, control system, vector control system, etc., can solve the problems of high cost, complex duty cycle calculation and register setting, complex structure, etc., and achieve simplification Calculation, reduction of duty cycle calculation time, low cost effect

Active Publication Date: 2020-02-04
SHANDONG ACAD OF SCI INST OF AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It only partially simplifies the calculation of the sector number, but still needs to calculate the basic vector maintenance time, and according to U s In the six different situations of the sector, the duty cycle register of the PWM is set according to the basic vector maintenance time, which makes the duty cycle calculation and register setting method still complicated
[0006] The open application of China Public Application No. 201610429756.7 "A SVPWM Vector Sector Judgment Method for Permanent Magnet Synchronous Motor" introduces a method of winding auxiliary windings on the windings of motor a, b, and c respectively, and detecting the counter electromotive force of the auxiliary windings. Therefore, the method of judging the sector where the synthesized vector is located requires winding three sets of physical windings, and also needs to detect the back electromotive force, the structure is complex, and the implementation cost is high

Method used

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  • Method and system for determining sector and duty cycle of three-phase alternating current motor SVPWM control

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Embodiment 1

[0044] figure 1 It is a method for determining sectors and duty ratios in the SVPWM control of the three-phase AC motor involved in this embodiment. Such as figure 1 As shown, the method includes the following steps:

[0045] S101, establish a new three-phase reference frame (a', b', c'), and calculate the axial component U of the synthetic voltage space vector in the three-phase reference frame (a', b', c') a’ ,U b’ ,U c’ .

[0046] Specifically, the specific implementation process of the step 101 is as follows:

[0047] Rotate the (a, b, c) three-phase reference system 90 degrees counterclockwise to form a new (a', b', c') reference system, where the a' axis and the (α, β) orthogonal coordinate system The β-axis is coaxial and in the same direction, and is perpendicular to the starting vectors of No. 1 and No. 4 sectors in SVPWM control; the b' axis is in the direction of 120 degrees of counterclockwise rotation of the a' axis, and is in the same direction as No. 3 and...

Embodiment 2

[0083] This embodiment provides a system for determining sectors and duty ratios in SVPWM control of a three-phase AC motor, the system comprising:

[0084] The coordinate system establishment module is used to establish a three-phase reference coordinate system, and calculates the axis component of the synthetic voltage space vector under the three-phase reference system;

[0085] The sector judging module is used to judge the sector where the synthesized voltage space vector is located by using the axis component of the synthesized voltage space vector in the three-phase reference system;

[0086] The per-unit conversion module is used to obtain the DC bus voltage of the three-phase inverter, calculate the voltage reference value, and use the voltage reference value as the per-unit conversion base value to standardize the axis components of the synthesized voltage space vector in the three-phase reference system Unitized processing to obtain the per unitized component of the...

Embodiment 3

[0108] This embodiment provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the following steps are implemented:

[0109] Establish a three-phase reference coordinate system, and calculate the axis component of the synthetic voltage space vector in the three-phase reference system;

[0110] Using the axis component of the synthesized voltage space vector in the three-phase reference system, determine the sector where the synthesized voltage space vector is located;

[0111] Obtain the DC bus voltage of the three-phase inverter, calculate the voltage reference value, and use the voltage reference value as the per-unit base value to perform per-unit processing on the axis components of the synthetic voltage space vector in the three-phase reference system to obtain the synthetic voltage the per unitized components of the space vector;

[0112] Define the intermediate variable, according to the unitiz...

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Abstract

The invention discloses a method and system for determining a sector and duty cycle of three-phase alternating current motor SVPWM control. The method includes the following steps that a three-phase reference coordinate system is established, and an axial component of a synthetic voltage space vector under the three-phase reference system is calculated; the axial component of the synthetic voltagespace vector under the three-phase reference system is used for judging the sector of the synthetic voltage space vector; a direct current bus voltage of a three-phase inverter is obtained, a voltagereference value is calculated, the voltage reference value is used as a per unit basis value, per unit treatment is carried out on the axial component of the synthetic voltage space vector under thethree-phase reference system, and an per unit component of the synthetic voltage space vector is obtained; and an intermediate variable is defined, and the duty cycle of a three-phase PWM module undera center justification PWM mode is calculated according to the per unit component of the synthetic voltage space vector and the sector of the synthetic voltage space vector Us.

Description

technical field [0001] The disclosure belongs to the field of motor control, and in particular relates to a method and system for determining sectors and duty ratios in SVPWM control of three-phase AC motors. Background technique [0002] Space Vector Pulse Width Modulation SVPWM technology is widely used in field-oriented control of three-phase AC motors, and its realization is mainly divided into three steps. First, judge the synthetic voltage space vector U according to the α and β axis components s sector; second, calculate the PWM switching period T s Next, the sustaining time T of the sector start vector, end vector and zero vector x , T y , T 0 ; Third, according to T x , T y , T 0 Calculate and set the duty ratio registers of the PWM modules corresponding to the three-phase bridge inverters a, b, and c respectively. [0003] Currently, judging the resultant voltage space vector U s The general method of the sector is: put U s Calculate the arc tangent after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/08
CPCH02P21/00H02P27/08
Inventor 马建辉高佳宋宁冉周广旭朱孟美慕永云
Owner SHANDONG ACAD OF SCI INST OF AUTOMATION