A simplified method of finite state set model prediction pmsm direct torque control

A technology of direct torque control and finite state set, applied in the direction of control system, control generator, vector control system, etc., can solve the problem of increasing the running time and complexity of predictive calculation, reduce the number of switching tables, and reduce the calculation burden , Reduce the effect of unreasonable torque ripple

Active Publication Date: 2021-03-30
CHANGAN UNIV
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Problems solved by technology

[0004] However, with the variables and operation functions, the time and complexity of predictive calculation operation are increased. Therefore, a finite state set model based on the law of voltage vector utilization ratio is proposed to predict the simplified method of PMSM direct torque control, and then optimize the performance of the control system.

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  • A simplified method of finite state set model prediction pmsm direct torque control
  • A simplified method of finite state set model prediction pmsm direct torque control
  • A simplified method of finite state set model prediction pmsm direct torque control

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Embodiment Construction

[0068] See figure 1 with figure 2 The present invention provides a finite state set model predicts the PMSM direct torque control simplification method based on voltage vector utilization rate regular, first pass the current torque and stator magnetic chain, reference torque, and the angle of the stator magnetic chain. Location, and the stator magnetic hanging amplitude and torque value of the next moment are calculated, the cost g value is selected, and the basic voltage vector of the G value is selected.

[0069] See image 3 with Figure 4 , The judge of the hysteresis signal and the sector position signal, and the torque angle are added, simplify the alternate voltage set, and then calculate the cost function g value by the stator magnetic fountain value and the torque value of the next time, select the minimum G value. Basic voltage vector.

[0070] A limited state set model predicts the PMSM direct torque control simplification method, including the following steps:

[007...

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Abstract

The invention discloses a finite state set model prediction PMSM simplified direct torque control method, which calculates the g value of the cost function and brings it into seven basic voltage vector sets, adds a hysteresis loop control signal, adds a sector position signal and a torque angle Signal judgment to obtain the voltage vector with the minimum cost function; add the signal of the current torque angle, and use different hysteresis control signals, sector position signals and the range of different torque angles as constraints to simplify the set of alternative voltage vectors; according to The root mean square error of torque ripple, the root mean square error of flux linkage ripple, the average value of evaluation function and the average switching frequency are divided into 30 and 45 degrees, and the simplified alternative voltage vector set control strategy is used to reduce the cost of model predictive control. Computational burden to realize PMSM direct torque simplified control. The invention reduces the calculation burden while maintaining good control performance, and further reduces the times of switching tables.

Description

Technical field [0001] The present invention belongs to the field of motor control technology, and in particular, a finite state set model predicts a simplification method of direct torque control of PMSM. Background technique [0002] Direct torque control technology avoids a large amount of calculation in the rotation coordinate shift based on the stator magnetic chain coordinate system, avoiding a large amount of calculation of the rotation coordinate shift and the dependence of the motor parameters, the dynamic performance is good, and the torque response time is short. [0003] Surface Permanent Magnet Synchronous Motor Direct Torque Prediction Control System, six basic voltage vectors and two zero voltage vectors, introduction of evaluation functions, synthesize from two aspects of torque error and stator magnetic chain error, directly according to the stator magnetic The chain is in the angular position of the still coordinate, the output evaluation function is the lowest ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/30H02P27/12
CPCH02P27/12H02P21/30
Inventor 李耀华杨启东任佳越师浩浩
Owner CHANGAN UNIV
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