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A three‐phase voltage‐source neutral‐point‐clamped converter with divided capacitors
Author(s) -
Kamigaito Noriaki,
Kubota Yasumasa,
Masukawa Shigeo,
Iida Shoji
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(19971115)121:2<72::aid-eej9>3.0.co;2-q
Subject(s) - harmonics , total harmonic distortion , voltage , capacitor , waveform , transformer , inverter , rectifier (neural networks) , three phase , line (geometry) , electrical engineering , control theory (sociology) , engineering , electronic engineering , computer science , mathematics , stochastic neural network , geometry , control (management) , machine learning , artificial intelligence , recurrent neural network , artificial neural network
A new method for reducing harmonics involved in ac line currents of a three‐phase voltage‐source converter is proposed. It is applied to the conventional neutral‐point‐clamped inverter. By dividing a smoothing capacitor into four elements and adding four auxiliary switching devices, the input line‐to‐line voltages of the proposed converter can be made to have almost the same waveforms as a conventional 18‐phase rectifier with 18 devices and three input transformers. In this paper, circuit performance and input voltage waveforms are discussed, and the optimum parameters are determined. Effects of harmonic reductions can be clarified by theoretical results. We suggest several output voltage adjustment methods. Characteristics of power factors and distortion factors in these methods are theoretically and experimentally investigated. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 121(2): 72–82, 1997