Inductance-emulation-based active damping of dead-time-induced oscillations in a 100-kW induction motor drive

Volts-per-hertz (V/f) controlled induction motor drives could exhibit small-signal instability in the low and medium speed ranges, and particularly under light-load conditions. This results in sustained sub-harmonic oscillations in motor current, torque and speed. This instability is accentuated on account of inverter dead-time. This paper examines improving the stability by connecting an external inductor in series with the stator winding. Further, to avoid an actual external three-phase inductor which could be expensive in the case of high-power drives, a simple control scheme which emulates this series inductor is proposed. The emulation scheme also has the advantage that the value of series inductor could be programmable. This inductive emulation scheme, along with V/f control, is implemented on a TMS320F2812 DSP processor platform to control a 100-kW induction motor drive. Simulation and experimental results show that the proposed control scheme is effective in mitigating the oscillations in the 100-kW induction motor drive.

[1]  Ryuzo Ueda,et al.  Experimental results and their simplified analysis on instability problems in PWM inverter induction motor drives , 1989 .

[2]  J. Nanda,et al.  Stability study of induction motors under variable-frequency modes in the presence of external inductors , 1978 .

[3]  Yoshihiro Murai,et al.  Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times , 1987, IEEE Transactions on Industry Applications.

[4]  Avanish Tripathi,et al.  Experimental Study on Dead-Time InducedOscillations in a 100-kW Open-Loop InductionMotor Drive , 2013 .

[5]  G. Narayanan,et al.  Small-Signal Stability Analysis of an Open-Loop Induction Motor Drive Including the Effect of Inverter Deadtime , 2014, IEEE Transactions on Industry Applications.

[6]  L. Ben-Brahim.  Improvement of the stability of the V/f controlled induction motor drive systems , 1998, IECON '98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.98CH36200).

[7]  G. Narayanan,et al.  Average modelling of a voltage source inverter with dead-time in a synchronous reference frame , 2013, 2013 IEEE Innovative Smart Grid Technologies-Asia (ISGT Asia).

[8]  F. Kulic,et al.  Prediction of local instabilities caused by inverter dead time in AC drive , 2009, 2009 13th European Conference on Power Electronics and Applications.

[9]  D. Boroyevich,et al.  Small-signal model of a voltage source inverter (VSI) considering the dead-time effect and space vector modulation types , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  G. Narayanan,et al.  Small-signal stability analysis of an open-loop induction motor drive including the effect of inverter dead-time , 2014, 2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES).

[11]  Bin Chen,et al.  Stability Analysis and Mitigation of Oscillation in an Induction Machine , 2014, IEEE Transactions on Industry Applications.

[12]  Mario A. Herran,et al.  Adaptive Dead-Time Compensation for Grid-Connected PWM Inverters of Single-Stage PV Systems , 2013, IEEE Transactions on Power Electronics.

[13]  Bin Chen,et al.  A novel stator flux oriented V/f control method in sensorless induction motor drives for accuracy improvement and oscillation suppression , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[14]  T. Sonoda,et al.  Stability analysis in induction motor driven by V/f controlled general purpose inverter , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[15]  Russel J. Kerkman,et al.  Pulse based dead time compensator for PWM voltage inverters , 1995, Proceedings of IECON '95 - 21st Annual Conference on IEEE Industrial Electronics.

[16]  Y. Q. Xiang.  Instability compensation of V/Hz PWM inverter-fed induction motor drives , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.