on the Performance of Optimal Flux Search Controller for DTC Based Induction Motor Drives

Application of a flux search controller in direct torque control of induction motor drives produces divergence problem and steady state flux ripple, because of the disturbance in the control loop. In this paper, an investigation about the origin of this noise has been performed. It is shown that the variation of voltage harmonics is the main reason of disturbance in the flux control loop. The minimum allowable value of flux step has been determined based on this analysis to prevent the divergence problem. Feasibility of noise cancellation has been discussed. Experimental results are presented to justify the theoretical analysis

[1]  Yoichi Hori,et al.  Fast efficiency optimization techniques for the indirect vector-controlled induction motor drives , 2003 .

[2]  N. Margaris,et al.  Loss minimization in scalar-controlled induction motor drives with search controllers , 1996 .

[3]  M.R. Zolghadri,et al.  Online optimal flux controller for DTC based induction motor drives , 2004, 30th Annual Conference of IEEE Industrial Electronics Society, 2004. IECON 2004.

[4]  Mohammad Reza Zolghadri,et al.  Flux harmonic spectrum processing of direct torque controlled induction motor , 2003, Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03..

[5]  J.R.G. Schofield.  Direct torque control-DTC [of induction motors] , 1995 .

[6]  J.K. Pedersen,et al.  Efficiency optimized control of medium-size induction motor drives , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[7]  M. Aaltonen,et al.  Direct torque control of AC motor drives , 1995 .