Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1991-03-13
1992-09-29
Voeltz, Emanuel T.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
363 37, H02M 5443
Patent
active
051518538
ABSTRACT:
A method of controlling a cycloconverter, for supplying an AC power having a given frequency to a converter group having at least two cascade-connected converters and controlling a firing angle of each of the converters, thereby converting the AC power supplied to the converter group into an AC power having a predetermined frequency, includes the steps of controlling an output voltage from a converter in one stage of the converter group to obtain an AC output voltage including a synthetic voltage of an AC voltage having an amplitude equal to a difference between a maximum output voltage of the converter and a DC voltage and a predetermined DC voltage in accordance with the polarity of a reference voltage signal having a predetermined frequency, controlling an output voltage from a converter in the other stage of the converter to obtain an AC output voltage obtained by subtracting the output from of the converter in one stage from the reference voltage signal, and continuously varying a voltage value of the DC voltage in accordance with the frequency of the reference voltage signal.
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1986 IEEE, Hiromi Hosoda et al., "A New Concept High-Performance Large-Scale AC Drive System", IEEE, pp. 229-234.
Okayasu Masami
Tatara Shinji
Kabushiki Kaisha Toshiba
Voeltz Emanuel T.
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