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Improved voltage source inverter with 18-step output waveforms

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3 Author(s)
Iida, S. ; Tokyo Denki Univ., Japan ; Masukawa, S. ; Kubota, Y.

In this article, an improved voltage source inverter is proposed. This circuit is based on the NPC (neutral point clamped) inverter. By dividing the input DC source into four sections and adding four auxiliary switching elements, the proposed circuit can be performed as if an 18-step inverter as far as the harmonic components in the AC output voltages are concerned. The performances of the proposed circuit and the output AC voltage waveforms are discussed. Then the optimum conditions are determined by minimizing the distortion of the output waveform, and the effects for the harmonic reductions can be clarified by theoretical results. The ratings of circuit components, such as the separated DC sources and the switching devices, should be investigated. Moreover, we suggest the adjusting methods of the output voltages

Published in:

Industry Applications Magazine, IEEE  (Volume:4 ,  Issue: 1 )

Date of Publication:

Jan/Feb 1998

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