Title: A novel direct torque control for induction motor drive system with low torque ripple and current distortion utilising FPGA

Authors: R. Rajendran; N. Devarajan

Addresses: Karpagam College of Engineering, Coimbatore 641 032, India ' Government College of Technology, Coimbatore 641 013, India

Abstract: The conventional Direct Torque Control (DTC) is known to produce quick and robust response in ac drives. However, during steady state, notable torque and current pulsations occur. They are reflected in speed estimation, torque response and also produce acoustic noise. In this paper, a novel Space Vector Modulated Direct Torque Control (SVM-DTC) with Low Pass Filter (LPF) for induction motor drive system is proposed, which features low torque ripple, low current distortion and fixed switching frequency. The proposed scheme has been implemented on the Xilinx Spartan 3E FPGA, both simulation and experimental results show that the proposed system can dramatically improve the steady state performance while preserving the dynamic performance of the conventional DTC.

Keywords: induction motor drives; direct torque control; SVM-DTC; space vector machines; SVM; modulated DTC; FPGA; XSG; Xilinxsystem generator; simulation; LPF; low pass filters; field programmable gate arrays; torque ripple; current distortion; speed estimation; torque response; acoustic noise; induction motors; switching frequency.

DOI: 10.1504/IJVAS.2013.053786

International Journal of Vehicle Autonomous Systems, 2013 Vol.11 No.2/3, pp.292 - 312

Received: 23 Sep 2011
Accepted: 05 Mar 2012

Published online: 09 May 2013 *

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