A Simplified Method for Predicting PMSM Direct Torque Control with Seven Basic Voltage Ensemble Models

Abstract

The present invention discloses a simplified method for predicting PMSM direct torque control with seven basic voltage set models, calculating the g value of the cost function and bringing it into seven basic voltage vector sets, and judging by adding sector position signals and torque angle signals, again The cost function g value is calculated by the stator flux linkage amplitude and torque value at the next moment, and the voltage vector with the minimum cost function is obtained; the signal of the current torque angle is added, and the range of different sector position signals and different torque angles is used As a restrictive condition, the voltage vector with low utilization rate is discarded; 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, a simplified alternative voltage vector set control strategy is adopted to reduce The computational burden of model predictive control to implement direct torque control. On the premise of maintaining good control performance, the present invention also reduces the burden of prediction calculation.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a simplified method for predicting PMSM direct torque control with seven basic voltage set models. 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, which avoids 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] In the surface permanent magnet synchronous motor direct torque prediction control system, there are six basic voltage vectors and two zero voltage vectors, the evaluation function is introduced, and the torque error and the stator flux linkage error are considered comprehensively. The angular position of the chain in the rest coordinates, output the voltage vector with the minimum evaluatio...

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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 simplified method for predicting PMSM direct torque control based on seven basic voltage set models based on voltage vector utilization is proposed to optimize the performance of the control system.

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