A Streamlined Alternative Finite State Set Model Predictive Direct Torque Control Method

Abstract

The invention discloses a method for predicting direct torque control with a simplified alternative finite state set model, which calculates the g value of the cost function and brings it into seven basic voltage vector sets, adding a hysteresis loop control signal, a sector position signal and a torque angle Signal judgment, calculate the cost function g value through the stator flux linkage amplitude and torque value at the next moment, and obtain the voltage vector with the smallest cost function; add the current torque angle signal, control the signal with different hysteresis, sector position The signal and the range of different torque angles are used as limiting conditions, and the voltage vector with low utilization rate is discarded; through the root mean square error of torque ripple, the root mean square error of flux linkage ripple, the average value of the evaluation function and the average switching frequency index, the simplified backup method is adopted The voltage vector set control strategy is selected to reduce the calculation burden of model predictive control and realize direct torque control. On the premise of maintaining good control performance, the present invention reduces the burden of prediction calculation and effectively improves the real-time performance of the system.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a direct torque control method for simplification and alternative finite state set model prediction. 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, avoiding 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 evaluation ...

AI Technical Summary

Problems solved by technology

[0004] However, with the variable and operation function, the time and complexity of predictive calculation operation are increased. Therefore, a simplified alternative finite state set model prediction direct torque control method based on voltage vector utilization is proposed to optimize the performance of the control system.

Images