Digital control of induction motor current with deadbeat response using predictive state observer

For a high-power induction motor drive, the switching frequency of the inverter cannot become higher than one kilohertz, and such a switching frequency produces a large current ripple, which then produces torque ripple. To minimize the current ripple, a method based on deadbeat control theory for current regulation is proposed. The pulsewidth modulation (PWM) pattern is determined at every sampling instant based on stator current measurements, motor speed, current references, and rotor flux vector, which is predicted by a state observer with variable poles selection, so that the stator currents are controlled to be exactly equal to the reference currents at every sampling instant. The proposed method consists of two parts: (1) derivation of a deadbeat control and (2) construction of a state observer that predicts the rotor flux and the stator currents in the next sampling instant. This paper describes a theoretical analysis, computer simulations and experimental results. >

[1]  W. Leonhard,et al.  Microcomputer control of high dynamic performance ac-drives - A survey , 1986, Autom..

[2]  Kouki Matsuse,et al.  Improvement of Vector Controlled CSI-Fed Induction Motor Drives Using State Observer , 1988 .

[3]  Masato Koyama,et al.  Microprocessor-Based Vector Control System for Induction Motor Drives with Rotor Time Constant Identification Function , 1986, IEEE Transactions on Industry Applications.

[4]  Y. Hori,et al.  Implementation of robust flux observer based field orientation (FOFO) controller for induction machines , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[5]  Hideki Hashimoto,et al.  Torque control of induction motor using predictive observer , 1989, 20th Annual IEEE Power Electronics Specialists Conference.

[6]  A. Kawamura,et al.  Real time digital feedback control of three phase PWM inverter with quick transient response suitable for uninterruptible power supply , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[7]  Atsuo Kawamura,et al.  Deadbeat control of induction motor current using state observer with adaptive poles selection , 1990 .

[8]  Yasuhiko Dote.  Stabilization of Controlled Current Induction Motor Drive Systems via New Nonlinear State Observer , 1980, IEEE Transactions on Industrial Electronics and Control Instrumentation.

[9]  Atsuo Kawamura,et al.  An analysis of induction motor field oriented or vector control , 1983, 1983 IEEE Power Electronics Specialists Conference.

[10]  Atsuo Kawamura,et al.  Deadbeat controlled PWM inverter with parameter estimation using only voltage sensor , 1988, 1986 17th Annual IEEE Power Electronics Specialists Conference.