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

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 ...

AI Technical Summary

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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