Harmonics mitigation of dead time effects in PWM converters using a repetitive controller

Yang, Y., Zhou, K. and Blaabjerg, F. (2015) Harmonics mitigation of dead time effects in PWM converters using a repetitive controller. In: IEEE Applied Power Electronics Conference and Exposition (APEC 2015), Charlotte, NC, USA, 15-19 Mar 2015, pp. 1479-1486. (doi: 10.1109/APEC.2015.7104543)

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n order to prevent the power switching devices (e.g., the Insulated-Gate-Bipolar-Transistor, IGBT) from shoot-through in voltage source converter during a switching period, a dead time is added either in the hardware drivers of the IGBTs or implemented in the software Pulse-Width Modulation (PWM) scheme. Both methods will lead to a degradation of the injected current power quality. Thus, the harmonics induced by the dead time have to be compensated in order to achieve a satisfactory current as required by the standards. In this paper, a repetitive controller has been introduced to eliminate the dead-time effect in grid-connected PWM converters. The repetitive controller has been plugged into a proportional resonant based fundamental controller. Compared with the traditional dead-time compensation solutions, the repetitive controller can effectively compensate the dead-time harmonics as well as other low-order distortions, and also it is a simple method without hardware modifications. Experimental results are demonstrating the advantages of the proposed dead-time effect mitigation method compared to the resonant based harmonic compensator.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Zhou, Dr Keliang
Authors: Yang, Y., Zhou, K., 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
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