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Variable-amplitude voltage vector selection method based on prediction control

A voltage vector, predictive control technology, applied in the control of generators, control of electromechanical brakes, control of electromechanical transmissions, etc., can solve the problems of inconsistent torque changes and expectations, torque ripple, etc., to reduce torque ripple and switching frequency. constant effect

Inactive Publication Date: 2017-12-29
CHANGAN UNIV
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Problems solved by technology

[0003] The effect of the voltage vector in the direct torque control system of the permanent magnet synchronous motor realized by the traditional switch table does not always meet expectations. When the torque angle is large, the voltage vector selected by the switch table has a control requirement on the stator flux linkage and torque On the contrary, the change of torque is inconsistent with the expectation, causing torque ripple

Method used

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  • Variable-amplitude voltage vector selection method based on prediction control
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  • Variable-amplitude voltage vector selection method based on prediction control

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] see figure 1 , the permanent magnet synchronous motor direct torque control system based on predictive control selects the voltage vector angle in a given interval, minimizes the evaluation function through predictive control and selects the voltage vector amplitude, and then synthesizes the required voltage vector through space vector modulation , drive the motor through an inverter.

[0052] see figure 2 , the present invention includes the following steps: Step 1, select the angle of the voltage vector in the interval given by the interval table;

[0053] Step 2: Select the voltage vector magnitude that minimizes the evaluation function among the variable voltage vector magnitudes based on predictive control.

[0054] Step 3, synthesizing the required voltage vector through the space vector modulation technique.

[0055] The process of determining the in...

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Abstract

The invention discloses a variable-amplitude voltage vector selection method based on prediction control. The voltage vector amplitude enabling the evaluation function to be minimal is selected from the variable voltage vector amplitude so that the requirements of the torque and the flux linkage can be better met, and the required voltage vector can be synthesized through the space vector modulation technology. The torque ripple can be reduced and the switching frequency is constant.

Description

technical field [0001] The invention relates to a voltage vector selection method, in particular to a variable-amplitude voltage vector selection method based on predictive control. Background technique [0002] The direct torque control technology is based on the stator flux coordinate system and directly takes the torque as the control object, avoiding a large number of calculations during the transformation of the rotating coordinates and the dependence on the motor parameters. It has good dynamic performance and short torque response time. [0003] The role of the voltage vector in the permanent magnet synchronous motor direct torque control system realized by the traditional switch table does not always meet expectations. When the torque angle is large, the voltage vector selected by the switch table has a control requirement on the stator flux linkage and torque On the contrary, the variation of the torque is inconsistent with the expectation, thus causing the torque r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/30
CPCH02P21/14H02P21/30
Inventor 李耀华焦森曲亚飞师浩浩孟祥臻
Owner CHANGAN UNIV
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