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A Direct Torque Control Method Based on Space Voltage Vector Prediction

A technology of direct torque control and space voltage vector, applied in vector control system, motor control, motor generator control and other directions, can solve the problems of control system control delay, real-time running situation mismatch, etc., to reduce workload, Eliminate the effect of one-shot delay and small torque ripple

Active Publication Date: 2021-06-29
TIANJIN POLYTECHNIC UNIV
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AI Technical Summary

Problems solved by technology

In the traditional method, in the digital control system, due to the time spent by hardware and software, there is a common phenomenon of control delay in the control system, which leads to the mismatch between the required voltage value and the real-time operation

Method used

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  • A Direct Torque Control Method Based on Space Voltage Vector Prediction
  • A Direct Torque Control Method Based on Space Voltage Vector Prediction
  • A Direct Torque Control Method Based on Space Voltage Vector Prediction

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Embodiment Construction

[0021] A direct torque control method based on space voltage vector prediction of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0022] A direct torque control main circuit and control system of a direct torque control method based on space voltage vector prediction of the present invention are as follows: figure 1 In the figure, PI represents the proportional-integral controller, the motor speed and position information are obtained by the incremental encoder, and ABC / dq represents the transformation from the ABC three-phase coordinate system to the d-axis and q-axis two-phase rotating coordinate systems The equation corresponds to formula (2) in the specification.

[0023] like image 3 As shown, a direct torque control method based on space voltage vector prediction of the present invention includes the following steps:

[0024] 1) At time k, the physical quantity is sampled by the control system,...

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Abstract

A direct torque control method based on space voltage vector prediction, a new voltage vector calculation method is obtained through theoretical derivation, the number of PI regulators is reduced, and the flux linkage at (k+1) time is obtained by predictive control algorithm And torque value, in order to eliminate the problem of one beat delay. It effectively reduces the workload when setting PI parameters, eliminates a one-beat delay, and makes the system have smaller torque fluctuations. With the help of the prediction algorithm to eliminate the influence of one beat delay, the x-axis voltage component obtained by the calculation method can theoretically be the stator flux linkage to achieve the dead-beat control effect, and further reduce the torque ripple, and the y-axis voltage component is adjusted by PI Obtained by the controller, it can ensure that the system achieves the effect of no static difference in torque during operation, so that the static error problem caused by the change of motor parameters can be eliminated.

Description

technical field [0001] The invention relates to a control method of a permanent magnet synchronous motor. In particular, it relates to a direct torque control method based on space voltage vector prediction. Background technique [0002] The traditional direct torque control method based on space voltage vector modulation uses the difference between the observed values ​​of flux linkage and torque and their respective given values ​​to obtain the error value Δψ of flux linkage and torque s and ΔT e , pass the torque error value through a PI regulator to obtain the amplitude of the reference voltage vector, pass the flux linkage error through a PI regulator to obtain the phase angle of the reference voltage vector, and then use SVPWM to synthesize the obtained voltage vector to act on the motor, but over Many PI regulators will increase the workload of the debugging stage, and no specific theoretical derivation is given in the traditional method. In the traditional digital...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P25/022
CPCH02P21/0003H02P2207/05H02P25/024
Inventor 谷鑫沈攀王志强李新旻周湛清夏长亮
Owner TIANJIN POLYTECHNIC UNIV
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