A full speed domain model predictive flux linkage control method for permanent magnet synchronous motors

Abstract

The invention discloses a full-speed domain model prediction flux linkage control method of a permanent magnet synchronous motor. Firstly, a reference torque T is obtained through a speed outer loop PI controller. e ref ; Then get the electrical angle θ of the permanent magnet synchronous motor r and electrical angular velocity ω r , and obtain the three-phase stator current at time k, and obtain the d-q axis component of the stator current at time k after coordinate transformation; then, combine the flux linkage equation and load angle to calculate the flux linkage, and obtain the flux linkage at (k+1) time Predicted value and reference value of flux linkage; then, use the predicted value and reference value of the flux linkage at (k+1) time to construct the value function in the full-speed domain, and obtain the optimal voltage vector of the inverter by minimizing the value function in the full-speed domain; finally according to q The axis flux linkage deadbeat idea calculates the duty cycle, and allocates the time when the optimal voltage vector and zero vector act on the inverter. The invention can effectively reduce the current and torque ripple, and meanwhile has good dynamic and steady state performance, and can be applied in both the constant torque region and the constant power region.

Description

technical field [0001] The invention relates to a full-speed domain model prediction flux linkage control method of a permanent magnet synchronous motor, which belongs to the field of motor drive and control. Background technique [0002] Permanent magnet synchronous motor (Permanent magnet synchronous motor, PMSM) has the advantages of low loss, low temperature rise, high power factor, high starting torque, short starting time, and high overload capacity. Traditional permanent magnet synchronous motor control methods mainly include vector control (Vector control, VC) and direct torque control (Direct torque control, DTC). VC is a linear control method that independently controls flux linkage and torque by controlling excitation current and torque current. However, the coordinate transformation is complicated, and the current regulator is usually PI control, and the PI control has an inertial link and a hysteresis effect, which makes the dynamic performance of the system po...

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Problems solved by technology

However, this patent does not consider the cumbersome design of weight coefficients in the full-speed domain value function, nor does it consider the problem of large current and torque ripples in model predictive torque control

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