Sensorless double-inverter-fed wound-rotor induction-Machine drive

The basic operation of a wound-rotor induction-motor drive fed by inverters on the stator as well as the rotor side is discussed. Different modes of operations are defined and explained based on power flow on both the sides of the machine. The sensorless motor control scheme consists of V/f-type direct frequency control on one side, with either vector control or direct torque and flux control on the other side. The machine operates up to twice the rated speed in either direction, with full flux and torque, thereby producing up to twice the rated power. Novel frequency profiles are proposed, which ensure that the frequency on either side never drops below a minimum value (set at 12 Hz in this work). Therefore, the estimation of flux can be simply and reliably carried out by integration of voltage, resulting in simple sensorless control. The drive works reliably at all speeds including zero speed and at all loads. Results from a 50-hp prototype drive are presented.

[1]  V. T. Ranganathan,et al.  A simple position-sensorless algorithm for rotor-side field-oriented control of wound-rotor induction machine , 2001, IEEE Trans. Ind. Electron..

[2]  P. Lataire,et al.  Application of the double fed asynchronous motor (DFAM) in variable-speed drives , 2002 .

[3]  Longya Xu,et al.  Torque and reactive power control of a doubly-fed induction machine by position sensorless scheme , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[4]  Werner Leonhard,et al.  Control of Electrical Drives , 1990 .

[5]  Andreas Steimel,et al.  Direct self control of induction machines fed by a double three-level inverter , 1997, IEEE Trans. Ind. Electron..

[6]  M. Depenbrock,et al.  Direct self-control (DSC) of inverter-fed induction machine , 1988 .

[7]  E. Bogalecka.  Power control of a double fed induction generator without speed or position sensor , 2002 .

[8]  T. Ohtani,et al.  Vector control of induction motor without shaft encoder , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[9]  R. Datta,et al.  Direct power control of grid-connected wound rotor induction machine without rotor position sensors , 2001 .

[10]  T.G. Habetler,et al.  Control strategies for direct torque control using discrete pulse modulation , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[11]  J. M. Kauffmann,et al.  Double-fed induction machine: converter optimisation and field oriented control without position sensor , 1998 .

[12]  V. T. Ranganathan,et al.  Direct torque and frequency control of double-inverter-fed slip-ring induction motor drive , 2004, IEEE Transactions on Industrial Electronics.

[13]  Takao Kawabata,et al.  Vector-controlled double-inverter-fed wound-rotor induction motor suitable for high-power drives , 1999 .

[14]  V. T. Ranganathan,et al.  Sensorless field oriented control for double inverter fed wound rotor induction motor drive , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[15]  Barna Szabados,et al.  High-power cycloconverter drive for double-fed induction motors , 1992, IEEE Trans. Ind. Electron..