Analysis and mitigation of dead time harmonics in the single-phase full-bridge PWM converters with repetitive controllers

Yang, Y., Zhou, K. , Wang, H. and Blaabjerg, F. (2018) Analysis and mitigation of dead time harmonics in the single-phase full-bridge PWM converters with repetitive controllers. IEEE Transactions on Industry Applications, 54(5), pp. 5343-5354. (doi:10.1109/TIA.2018.2825941)

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Abstract

In order to prevent the power switching devices (e.g., the Insulated-Gate-Bipolar-Transistor, IGBT) from shoot through in voltage source converters during a switching period, the dead time is added either in the hardware driver circuits of the IGBTs or implemented in software in Pulse-Width Modulation (PWM) schemes. Both solutions will contribute to a degradation of the injected current quality. As a consequence, the harmonics induced by the dead time (referred to as "dead time harmonics" hereafter) have to be compensated in order to achieve a satisfactory current quality as required by standards. In this paper, the emission mechanism of dead time harmonics in single-phase PWM inverters is thus presented considering the modulation schemes in details. More importantly, a repetitive controller has been adopted to eliminate the dead time effect in single-phase grid-connected PWM converters. The repetitive controller has been plugged into a proportional resonant-based fundamental current controller so as to mitigate the dead time harmonics and also maintain the control of the fundamental frequency grid current in terms of dynamics. Simulations and experiments are provided, which confirm that the repetitive controller can effectively compensate the dead time harmonics and other low-order distortions, and also it is a simple method without hardware modifications.

Item Type:Articles
Keywords:Harmonics, dead time, repetitive control, resonant control, PWM converters, modulation, insulated-gate bipolar- transistor (IGBT).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Zhou, Dr Keliang
Authors: Yang, Y., Zhou, K., Wang, H., and Blaabjerg, F.
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:IEEE Transactions on Industry Applications
Publisher:IEEE
ISSN:0093-9994
ISSN (Online):1939-9367
Published Online:14 April 2018
Copyright Holders:Copyright © 2018 IEEE
First Published:First published in IEEE Transactions on Industry Applications 54(5): 5343-5354
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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