FPGA-Based Fixed Point Implementation of a Real-Time Induction Motor Emulator

This paper investigates the numerical issue of a discrete-time induction-motor emulator implementation. The stability analysis of the finite-word-length implementation shows a coupling between required word length and the sample rate. We propose specific guidelines to analyze this coupling and to estimate the required data word length for both signals and coefficients of the model. To respect algorithm requirements, an FPGA-based implementation was used for architecture development. The direct torque control is implemented to verify in real time the AC-motor emulator prototype.

[1]  I. Slama-Belkhodja,et al.  FPGA-based real-time emulation of induction motor using fixed point representation , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[2]  Joan Carletta,et al.  A methodology for FPGA-based control implementation , 2005, IEEE Transactions on Control Systems Technology.

[3]  J. Wu,et al.  Analysis of sensitivity measures of finite-precision digital controller structures with closed-loop stability bounds , 1998 .

[4]  Yves Sorel,et al.  Optimized rapid prototyping for real-time embedded heterogeneous multiprocessors , 1999, Proceedings of the Seventh International Workshop on Hardware/Software Codesign (CODES'99) (IEEE Cat. No.99TH8450).

[5]  Hung-Ming Cheng,et al.  Coupling between Sample Rate and Required Wordlength for Finite Precision Controller Implementation with Delta Transform , 2007, 2007 American Control Conference.

[6]  Daniel Ménard,et al.  Automatic evaluation of the accuracy of fixed-point algorithms , 2002, Proceedings 2002 Design, Automation and Test in Europe Conference and Exhibition.

[7]  Monson H. Hayes.  Schaum's Outline of Theory and Problems of Digital Signal Processing , 1998 .

[8]  Sheng Chen,et al.  Optimal finite-precision state-estimate feedback controller realizations of discrete-time systems , 2000, IEEE Trans. Autom. Control..

[9]  Toshihiko Noguchi,et al.  A New Quick-Response and High-Efficiency Control Strategy of an Induction Motor , 1986, IEEE Transactions on Industry Applications.

[10]  Eric Monmasson,et al.  FPGA Design Methodology for Industrial Control Systems—A Review , 2007, IEEE Transactions on Industrial Electronics.

[11]  Antonello Monti,et al.  A new testing tool for power electronic digital control , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[12]  Seppo J. Ovaska,et al.  A digital signal processing approach to real-time AC motor modeling , 1992, IEEE Trans. Ind. Electron..