Model predictive control of induction motor based on amplitude–phase motion equation

• Published in: IET power electronics Vol. 12; no. 9; pp. 2400 - 2406
• Main Authors: Lu, Ziguang, Zhang, Ruilin, Hu, Likun, Gan, Lin, Lin, Jingyu, Gong, Pingping
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 07.08.2019
• Subjects: amplitude–phase motion equation; control complexity; control variables; conventional model predictive torque control; conventional MPTC; flux amplitude; IMs; induction motor; induction motor drives; induction motors; machine control; model predictive control; novel MPTC strategy; predictive control; radial orientation; reactive torque; Research Article; rotor flux; RT‐MPC; tedious adjustment; time scales; torque control; weighting factor; wide application; conventional MPTC; model predictive control; machine control; control variables; time scales; flux amplitude; induction motor; induction motors; control complexity; induction motor drives; reactive torque; radial orientation; torque control; IMs; r; weighting factor; tedious adjustment; RT-MPC; rotor flux; novel MPTC strategy; wide application; predictive control; conventional model predictive torque control; amplitude–phase motion equation
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2019.0093

Tedious adjustment of the weighting factor restricts the wide application of conventional model predictive torque control (MPTC) for induction motors (IMs) in practice. To solve this problem, this study introduces a new variable R (reactive torque) to control the flux of IM, which is the dual of torque T, with radial orientation and in relation to reactive power. Then, a novel MPTC strategy based on variable R and torque T is proposed and named RT-MPC. Compared with conventional MPTC, RT-MPC uses a pair of variables with the same dimensions and time scales instead of the torque and flux amplitude in MPTC. This approach eliminates the weighting factor of the cost function, unifies the time scales of control variables, and avoids prediction of rotor flux at the (k + 2) instant. Simulation and experimental results show that RT-MPC can avoid the weighting factor, reduce switching frequency, and reduce control complexity. RT-MPC can also maintain excellent dynamic and steady-state performance similar to conventional MPTC. Hence, the proposed method is expected to be more practical.