Title: Adaptive hysteresis-band current controller

Authors: Rami A. Maher; Walid Emar; Jalil H. Amjad

Addresses: Electrical Engineering Department, University of Al-Isra, P.O. Box 33, 11622 Amman, Jordan; Control and Systems Engineering Department, University of Technology, 10071 Baghdad, Iraq ' Electrical Engineering Department, University of Al-Isra, P.O. Box 33, 11622 Amman, Jordan; Control and Systems Engineering Department, University of Technology, 10071 Baghdad, Iraq ' Electrical Engineering Department, University of Al-Isra, P.O. Box 33, 11622 Amman, Jordan; Control and Systems Engineering Department, University of Technology, 10071 Baghdad, Iraq

Abstract: One of the most complicated control problems in variable speed AC drives is the difficulty of processing feedback signal of the outer loop in the presence of harmonics. However, conventional fixed band hysteresis controller has a variable switching frequency throughout the fundamental period. A variable-hysteresis-band controller comes as a solution to reach an optimal ripple current. An improved implementation of the constant frequency hysteresis current control of three phase voltage-source inverters is presented. A simple, self-adjusting analogue prediction of the hysteresis band is added to the phase-locked-loop control to ensure constant switching frequency, even at a high rate of output voltage change. This allows high accuracy in tracking highly distorted current waveforms and minimises the ripple in multiphase systems. In this paper, the basic principles are described, and a detailed stability analysis is done. The control performance is illustrated, both by simulated and experimental results.

Keywords: constant frequency current controller; hysteresis control; constant switching frequency; hysteresis current control; voltage source inverters; VSI; adaptive control; variable speed AC drives; hysteresis band; phase-locked-loop control.

DOI: 10.1504/IJPEC.2013.057033

International Journal of Power and Energy Conversion, 2013 Vol.4 No.4, pp.319 - 338

Received: 02 Apr 2012
Accepted: 14 Sep 2012
Published online: 31 Mar 2014 *

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