A predictive algorithm for minimising dead-time distortions in sine-wave VSI with L-C output filter
by Suvarun Dalapati
International Journal of Power Electronics (IJPELEC), Vol. 5, No. 5/6, 2013

Abstract: In many applications, single-phase sine-wave inverters are operated with low-pass filters at the output to deliver a low-distortion sinusoidal voltage to the load. In such cases, it is essential that the output be as close to a sinusoid as possible. However, conventional bridge-type inverters, which must be operated with some dead time, suffer from dead-time distortion problems. This effect distorts the output voltage-waveform from its sinusoidal nature to one having significant amounts of low-frequency harmonics. In such cases, dead-time distortion is minimised by employing some suitable algorithm. This paper presents one such algorithm, predictive in nature, for minimising dead-time distortion in the output voltage of a sinusoidal Voltage Source Inverter (VSI) with L-C filter at the output. The algorithm operates by sensing only the load-current. Performance of this algorithm is verified for a single-phase full-bridge inverter, first by simulations and then via experiments, employing Digital Signal Processors (DSP) based inverter. It achieves THD values lesser than 3% for a wide range of load magnitudes and power-factors.

Online publication date: Tue, 14-Jan-2014

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