An Improved Dead-Time Compensation Scheme for Voltage Source Inverters Considering the Device Switching Transition Times

Guha, Anirudh and Narayanan, G (2014) An Improved Dead-Time Compensation Scheme for Voltage Source Inverters Considering the Device Switching Transition Times. In: IEEE India International Conference on Power Electronics, IICPE 2014, Dec 8-10, 2014, NIT Kurukshetra.

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Abstract

Inverter dead-time, which is meant to prevent shoot-through fault, causes harmonic distortion and change in the fundamental voltage in the inverter output. Typical dead-time compensation schemes ensure that the amplitude of the fundamental output current is as desired, and also improve the current waveform quality significantly. However, even with compensation, the motor line current waveform is observed to be distorted close to the current zero-crossings. The IGBT switching transition times being significantly longer at low currents than at high currents is an important reason for this zero-crossover distortion. Hence, this paper proposes an improved dead-time compensation scheme, which makes use of the measured IGBT switching transition times at low currents. Measured line current waveforms in a 2.2 kW induction motor drive with the proposed compensation scheme are compared against those with the conventional dead-time compensation scheme and without dead-time compensation. The experimental results on the motor drive clearly demonstrate the improvement in the line current waveform quality with the proposed method.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright for this article belongs to the IEEE, USA
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	13 Jan 2015 05:20
Last Modified:	13 Jan 2015 05:20
URI:	http://eprints.iisc.ac.in/id/eprint/50660

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