FIELD-ORIENTED CONTROL OF INDUCTION MACHINES IN THE PRESENCE OF MAGNETIC SATURATION

ABSTRACT This paper presents derivation of the equations which describe field-oriented control of saturated induction machines. Field-oriented control principles are applied on the saturated model of induction machine and new equations are obtained, which differ significantly from the well-known model valid when the main flux saturation is absent or neglected. Rotor flux oriented control of voltage-fed and current-fed saturated induction machines is discussed. New decoupling circuits which are needed under saturated conditions are presented. Simulation results, which show the influence of main flux saturation on transient behaviour of the drive and which verify the theoretical results are included.

[1]  Donald W. Novotny,et al.  The Influence of Motor Parameter Deviations in Feedforward Field Orientation Drive Systems , 1985, IEEE Transactions on Industry Applications.

[2]  Ion Boldea,et al.  A UNIFIED ANALYSIS OF MAGNETIC SATURATION IN ORTHOGONAL AXIS MODELS OF ELECTRIC MACHINES , 1987 .

[3]  J. E. Brown,et al.  Cross-Saturation in Smooth-Air-Gap Electrical Machines , 1986, IEEE Power Engineering Review.

[4]  R. D. Lorenz,et al.  Selection of Flux Level in Field-Oriented Induction Machine Controllers with Consideration of Magnetic Saturation Effects , 1987, IEEE Transactions on Industry Applications.

[5]  P. Vas,et al.  A Method of Including the Effects of Main Flux Path Saturation in the Generalized Equations of A.C. Machines , 1983, IEEE Power Engineering Review.

[6]  Kouhei Ohnishi,et al.  Decoupling Control of Secondary Flux and Secondary Current in Induction Motor Drive with Controlled Voltage Source and Its Comparison with Volts/Hertz Control , 1985, IEEE Transactions on Industry Applications.

[7]  H. Späth,et al.  Steuerverfahren für Drehstrommaschinen , 1983 .

[8]  J. Melkebeek,et al.  Magnetising-field saturation and dynamic behaviour of induction machines. Part 1: Improved calculation method for induction-machine dynamics , 1983 .

[9]  S. Nasar,et al.  A general equivalent circuit (GEC) of electric machines including cross-coupling saturation and frequency effects , 1988 .

[10]  Emil Levi,et al.  Magnetizing Curve Representation Methods In Digital Simulation Of Induction Macidne Dynamics , 1990 .

[11]  J.A.A. Melkebeek.  Magnetising-field saturation and dynamic behaviour of induction machines. Part 2: Stability limits of a voltage-fed induction motor and of a self-excited induction generator , 1983 .