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A new PWM scheme for NPC inverters which reduces waveform distortion due to pulsewidth limitation and a new neutral point voltage control
Author(s) -
Nakazawa Yooske,
Naitoh Haruo
Publication year - 1997
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(19970115)118:1<93::aid-eej9>3.0.co;2-i
Subject(s) - pulse width modulation , voltage , waveform , total harmonic distortion , harmonic , control theory (sociology) , square wave , distortion (music) , phase (matter) , point (geometry) , pulse (music) , scheme (mathematics) , physics , computer science , electronic engineering , engineering , electrical engineering , control (management) , mathematics , acoustics , mathematical analysis , geometry , amplifier , cmos , quantum mechanics , artificial intelligence
This paper presents a new PWM scheme for NPC inverters that is suitable for large capacity GTO inverters. In conventional NPC inverters, a pulse of narrow width is needed to synthesize a low‐voltage wave. A pulsewidth limitation due to the use of GTOs causes differences between output phase voltages and reference voltages. This paper proposes a scheme in which square waves are added to all three‐phase voltage references to enable a low‐voltage to be synthesized with no narrow pulses and significant reduction in harmonic components of output voltage results. Also, a new neutral point voltage control is proposed. Finally, a theoretical analysis and experimental results for the proposed scheme are presented. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (1): 93–105, 1997