Permanent magnet synchronous motor dynamic finite state set model prediction torque control method

Abstract

The invention discloses a permanent magnet synchronous motor dynamic finite state set model prediction torque control method. Based on a surface permanent magnet synchronous motor flux linkage and torque prediction model, the action law of the voltage vector angle and amplitude on the motor flux linkage and torque is analyzed, an alternative voltage vector set is designed on line according to thesystem state by using fuzzy control, and the influence of adding a zero voltage vector in the alternative voltage vector set on the system control effect is analyzed. The control requirements of system torque, flux linkage, switching frequency and dynamic performance are comprehensively considered, the flux linkage error absolute value serves as a system static and dynamic judgment condition, thealternative voltage vector set of the system is dynamically adjusted, the alternative voltage vector set is simplified. Meanwhile, the comprehensive performance of the control system is improved, andtorque pulsation is reduced.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a dynamic finite state set model predictive torque control method for a permanent magnet synchronous motor. Background technique [0002] The finite state set model predictive control of the traditional permanent magnet synchronous motor performs model prediction and cost function calculation based on the seven basic voltage vectors that can be generated by the three-phase two-level inverter. Although the control idea of ​​finite state set model predictive control is simple, the seven basic voltage vector angles and amplitudes of the candidate voltage vector set in each control cycle are fixed, and the control effect on motor torque and stator flux linkage is limited, and there are torque ripple and The problem of large flux linkage pulsation. [0003] A voltage vector with variable angle and amplitude can be generated through space vector modulation, which opt...

AI Technical Summary

Problems solved by technology

[0003] A voltage vector with variable angle and amplitude can be generated through space vector modulation, which optimizes the system's control of torque and flux linkage, but it also brings about an increase in the number of alternative voltage vectors, and increases the system switching frequency and calculation burden. , and simply increasing the number of alternative voltage vectors has limitations in improving performance

Images