NDLI: A simplified 24-step inverter without output transformers

Content Provider	IEEE Xplore Digital Library
Author	Lida, S. Tamaki, K. Masukawa, S.
Copyright Year	2002
Description	Author affiliation: Tokyo Denki Univ., Japan (Lida, S.; Tamaki, K.; Masukawa, S.)
Abstract	In this paper, we propose an improved multi-level voltage source inverter whose output harmonic components can be effectively reduced regardless of simple construction. It is based on the neutral-point-clamped (NPC) inverter. The input DC source is divided into six sections and an auxiliary circuit composed of six switching devices and four clamping diodes are added into the conventional NPC inverter. By controlling the auxiliary circuit appropriately, quasi 24-step voltage waveforms can be outputted from the proposed inverter though it has no output transformers. In this paper, the circuit performances are described and the output voltage waveforms are derived theoretically. The circuit constants and the control parameters for decreasing the output harmonics are discussed. It is made clear that the proposed inverter can be performed with the same output distortions approximately as the conventional 24-step inverter with 24 switching devices and the heavy output transformers. Moreover, in order to adjust the output voltages, the step width control and the PWM control are investigated theoretically and experimentally.
Sponsorship	IEEE ice SICE Univ. Sevilla
Starting Page	1288
Ending Page	1293
File Size	348000
Page Count	6
File Format	PDF
ISBN	0780374746
DOI	10.1109/IECON.2002.1185461
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-11-05
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transformers Pulse width modulation inverters Switching circuits Voltage control Diodes Clamps Time frequency analysis Switching loss Arm
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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