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Coordinate component SVPWM control method for variable frequency speed regulation of three-phase asynchronous motor

A variable frequency speed regulation, three-phase asynchronous technology, applied in AC motor control, estimation/correction of motor parameters, control systems, etc., can solve the problems of poor real-time performance and large amount of calculation, achieve small amount of calculation and simplify position judgment. , the formula is simple and clear

Inactive Publication Date: 2015-01-07
HUAIYIN TEACHERS COLLEGE
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a coordinate component SVPWM control method for frequency conversion and speed regulation of three-phase asynchronous motors. The present invention effectively solves the traditional SVPWM control method for frequency conversion and speed regulation of three-phase asynchronous motors. Big, poor real-time problems

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  • Coordinate component SVPWM control method for variable frequency speed regulation of three-phase asynchronous motor
  • Coordinate component SVPWM control method for variable frequency speed regulation of three-phase asynchronous motor
  • Coordinate component SVPWM control method for variable frequency speed regulation of three-phase asynchronous motor

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Embodiment Construction

[0026] combined with figure 1 , 2 , 3, 4 further describe the present invention:

[0027] Such as figure 1 The three-phase two-level inverter shown is composed of 6 power switching devices. With point o as the reference voltage zero point, when the upper switch is turned on and the lower switch is turned off, this state is indicated by "1", and the output phase voltage is U dc ; When the upper tube is turned off and the lower tube is turned on, "0" is used to indicate this state, and the output phase voltage is 0.

[0028] The potentials of the DC neutral point o and the load neutral point N are not equal, but the expression of the synthetic voltage space vector is equal, that is, the three-phase synthetic voltage space vector has nothing to do with the reference point.

[0029] (1)

[0030] where α=e j2π / 3 , there are 8 combinations of the switch states of the three-phase bridge arms of the inverter, namely [000], [001], [010], [100], [101], [110], [111]. Substitu...

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Abstract

The invention discloses a coordinate component SVPWM control method for the variable frequency speed regulation of a three-phase asynchronous motor. The control method comprises the following control steps: coordinate component calculation, simplified judgment of the position of a reference voltage vector, simplified calculation of vector acting time and optimization selection of a switch vector acting sequence. The coordinate component SVPWM control method for the variable frequency speed regulation of the three-phase asynchronous motor effectively solves the problems that a traditional coordinate component SVPWM control method for the variable frequency speed regulation of the three-phase asynchronous motor is large in calculating amount and poor in real-time performance.

Description

technical field [0001] The invention relates to the technical field of frequency conversion speed regulation control of three-phase asynchronous motors, in particular to a coordinate component SVPWM control method for frequency conversion speed regulation of three-phase asynchronous motors. Background technique [0002] There are many kinds of PWM used for frequency conversion and speed regulation of three-phase asynchronous motors. Compared with traditional SPWM, space vector pulse width modulation technology SVPWM has the advantages of small torque ripple, high utilization rate of DC voltage, small current waveform distortion, and easy digitization. , the application is more and more extensive. SVPWM starts from the point of view of how to make the motor obtain a circular magnetic field with a constant amplitude, based on the ideal magnetic flux of the AC motor when the three-phase symmetrical sinusoidal voltage is supplied, and uses the actual magnetic flux generated by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/02H02P23/14H02P27/08
Inventor 何广明吕康飞
Owner HUAIYIN TEACHERS COLLEGE