NDLI: Novel multilevel PWM wave control method using series connected full bridge inverters

Content Provider	IEEE Xplore Digital Library
Author	Iwaya, K. Takahashi, I.
Copyright Year	2003
Description	Author affiliation: Nagaoka Univ. of Technol., Japan (Iwaya, K.; Takahashi, I.)
Abstract	This paper proposes a novel multilevel PWM inverter and its control method. Increasing output voltage level is effective to reduce harmonic distortion of the output voltage and the output filter size. The inverter output voltage level can be increased by series connection of several inverters. However, isolated DC power sources or transformers are required at the inverter output side. When the output voltage level is increased without using isolated DC power sources and transformers, lots of switching devices are required. In general, 2(M-1) switching devices are necessary in an M-level inverter. The proposed system is composed of a 9-level inverter and series-connected full bridge inverters without the DC power sources. Only electrolytic capacitors are implemented across the DC buses of the full-bridge inverters. The DC bus voltage of the electrolytic capacitors is kept at 1/8 of that of the 9-level inverter by charge and discharge process. Also, a 17-level output voltage is obtained by superimposing the 1/8 of the DC bus voltage on the 9-level output. The proposed system achieved the 17-level voltage waveform without any DC power sources and transformers, using only 20 switching devices. Furthermore, another multilevel inverter system is proposed in this paper, of which output voltage level is 33. The proposed method also can be employed in n-series connected inverters. In this paper, effectiveness of the proposed method is verified by experimental results of the two systems.
Sponsorship	IEEE Power Eng., Power Electon., Ind. Electron. & Ind. Appl. Soc.
Starting Page	1543
Ending Page	1548
File Size	299348
Page Count	6
File Format	PDF
ISBN	0780378172
DOI	10.1109/IEMDC.2003.1210656
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation inverters Transformers Voltage Power amplifiers Bridge circuits Harmonic distortion Circuit topology Power harmonic filters Capacitors High power amplifiers
Content Type	Text
Resource Type	Article

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