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A Direct Torque Control Method for Matrix Converter with Improved Torque and Flux Linkage Performance

A technology of direct torque control and matrix converter, which is applied in the direction of electronic commutation motor control, control system, control generator, etc., can solve the problems of inability to achieve effective adjustment of stator flux linkage and different amplitudes.

Active Publication Date: 2017-09-19
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this duty cycle control method can only generate voltage vectors with fixed directions and different amplitudes, it is impossible to effectively adjust the stator flux linkage.

Method used

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  • A Direct Torque Control Method for Matrix Converter with Improved Torque and Flux Linkage Performance
  • A Direct Torque Control Method for Matrix Converter with Improved Torque and Flux Linkage Performance
  • A Direct Torque Control Method for Matrix Converter with Improved Torque and Flux Linkage Performance

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Embodiment approach

[0133] The present invention will be described in further detail below in conjunction with specific examples and accompanying drawings. figure 1 For the implementation flow chart of the present invention, the implementation method of the present invention comprises the following steps:

[0134] (1) Detection of motor speed ω r , set the speed reference value ω r * , using the proportional-integral controller to obtain the electromagnetic torque reference value.

[0135] (2) Calculate the input phase voltage phase angle α i , output current two-phase stationary coordinate system component i oα i oβ , the output phase voltage two-phase static coordinate system component u oα , u oβ , the input current phase angle β i .

[0136] (2.1) Calculate the input phase voltage phase angle α i . Detect the three-phase phase voltage u on the input side of the MC a , u b , u c , and transform it into a two-phase stationary coordinate system component u iα , u iβ , through u ...

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Abstract

The invention discloses a direct torque control method for improving the torque and flux linkage performance of a matrix converter. The direct torque control method comprises the steps that (1) an MC-PMSM system torque and flux linkage evaluation function set is established; (2) an MC master-slave vector switch list is established according to the MC-PMSM system torque and flux linkage evaluation function set; (3) master-slave vectors are selected according to the MC master-slave vector switch list, and a master-slave vector duty ratio is calculated; (4) the master-slave vector duty ratio is constrained according to a calculated result of the master-slave vector duty ratio and acts on a motor system. According to the direct torque control method, a master vector and slave vector modulation strategy and a corresponding constraint method are put forward, and reasonable matching between multiple MC vectors can be achieved, and fluctuation of the torque and the flux linkage on the MC output side can be effectively suppressed. The direct torque control method is suitable for a permanent magnet synchronous motor speed regulating system with feed supplied by the matrix converter.

Description

technical field [0001] The invention belongs to the field of power converter control of driving motors, and in particular relates to a method for improving the performance of a matrix converter-permanent magnet synchronous motor speed control system using direct torque control. Background technique [0002] The permanent magnet synchronous motor (PMSM) system driven by a matrix converter (MC) has the advantages of small size, high efficiency, low harmonic pollution, and bidirectional energy flow, and has great development prospects. [0003] Direct torque control (direct torque control, DTC) was proposed in 1986. It was used to control the induction motor speed control system fed by voltage source inverse (VSI) in the early stage. It has a simple structure and does not depend on motor parameters. It has the advantages of not needing to rotate coordinate transformation, but it has the defects of excessive fluctuation of torque and flux linkage and unfixed switching frequency....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/30H02P25/022
Inventor 夏长亮赵家欣阎彦史婷娜
Owner TIANJIN UNIV
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