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Rapidly variable phase control method of character currents
Author(s) -
Ogawa Masaru
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(199702)118:3<67::aid-eej7>3.0.co;2-n
Subject(s) - capacitor , thyristor , variable capacitor , pulse (music) , voltage , coupling (piping) , decoupling capacitor , electrical engineering , materials science , control theory (sociology) , electronic engineering , computer science , engineering , control (management) , artificial intelligence , metallurgy
Phase control of capacitor currents is obtained by the method of forced turn‐off of the switching devices and turn‐on at the phases when the potential differences between ac source voltage and residual voltage of capacitor become zero. For the technique of forced turn‐off of the switching devices which conduct the capacitor currents, two circuit methods have been reported. One method used back‐to‐back thyristor choppers, and the other used a coupling reactor. However, the former generates pulse noises and the latter operates unstably. Therefore, a simple and stable circuit method, without generations of pulse noises, is expected for practical uses. For this purpose, new circuit methods are designed using self‐turn‐off devices. This paper reports the new method and characteristics of phase controls of capacitor currents when self‐turn‐off devices are used as the switching devices. © 1997 Scripta Technica, Inc. Electr Eng Jpn, 118 (3): 67–77, 1997