Universiti Teknologi Malaysia Institutional Repository

Constant and high switching frequency torque controller for DTC drives

Toh, C. L. and Idris, N. R. N. and Yatim, A. H. M. (2005) Constant and high switching frequency torque controller for DTC drives. IEEE, Power Electronics Letters, 3 (2). pp. 76-80. ISSN 1540-7985

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Abstract

The letter presents a new method of increasing the switching frequency of a direct torque control (DTC) of induction machines. The method simply replaces the hysteresis comparator of the conventional DTC drives with a triangular waveform-based constant switching frequency controller. By synchronizing the digital signal processor (DSP) sampling with a triangular waveform and with an appropriate systematic controller design, a high switching frequency DTC drive is possible without requiring a high-frequency space-vector modulator. The implementation of the controller is simple and operates based on waveform comparisons; in this letter it is implemented using a combination of a DSP and a field programmable gate array device. Simulation and experimental results indicate that the controller both reduces the torque ripple and maintains a constant switching frequency.

Item Type:Article
Uncontrolled Keywords:Ac drives DSP constant switching frequency controller digital signal processor direct torque control drives field programmable gate array hysteresis comparator induction machines induction motor drives synchronization torque ripple triangular waveform
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:1882
Deposited By: Dr Zaharuddin Mohamed
Deposited On:16 Mar 2007 07:28
Last Modified:01 Jun 2010 02:59

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