A dual-vector predictive flux linkage control method for permanent magnet synchronous motors

Abstract

The invention discloses a double-vector predictive flux linkage control method for a permanent magnet synchronous motor. First, the torque increment is converted into a load angle increment, and the control target is unified into a stator flux linkage vector; Voltage vector, and select the I vector through the interval position of the reference vector, and select the II vector through the sub-interval position of the reference vector; then by optimizing the duty cycle of the voltage vector, a control cycle is divided into two parts, and the I vector acts on Part of the control cycle, and the rest of the time to select the II vector or zero vector; finally, the selected voltage vector and duty cycle are calculated by loop optimization to obtain the optimal voltage vector and sent to the permanent magnet synchronous motor. The invention can reduce the system torque and flux linkage pulsation while reducing the calculation time of the processor, and improves the reliability and steady-state performance of the system.

Description

technical field [0001] The invention relates to a flux linkage control method, in particular to a flux linkage control method with double vector prediction for a permanent magnet synchronous motor. Background technique [0002] With the rapid improvement of microprocessor processing performance, the model predictive control method has attracted extensive attention from experts and scholars. The traditional predictive torque control strategy uses electromagnetic torque and stator flux linkage as control variables to realize direct control of torque and flux linkage. However, since the torque and flux linkage are not in the same dimension, the value function needs to introduce weight coefficients to balance the effects of electromagnetic torque and stator flux linkage, which requires complicated weight coefficient debugging; the predictive flux linkage control strategy realizes the torque And the control of the flux linkage variable becomes the control of the stator flux linka...

AI Technical Summary

Problems solved by technology

However, since the predictive flux control strategy imposes a basic voltage vector in one control cycle, it cannot solve the problem of poor steady-state performance, so it is of great interest to study a two-vector predictive flux control method for permanent magnet synchronous motors based on duty cycle modulation. development prospects

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